CN109991103B - Shear strength testing device and shear strength and static cone penetration test method thereof - Google Patents
Shear strength testing device and shear strength and static cone penetration test method thereof Download PDFInfo
- Publication number
- CN109991103B CN109991103B CN201910351683.8A CN201910351683A CN109991103B CN 109991103 B CN109991103 B CN 109991103B CN 201910351683 A CN201910351683 A CN 201910351683A CN 109991103 B CN109991103 B CN 109991103B
- Authority
- CN
- China
- Prior art keywords
- strain
- head
- cone
- gear
- conical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 58
- 230000035515 penetration Effects 0.000 title claims abstract description 55
- 230000003068 static effect Effects 0.000 title claims abstract description 22
- 238000010998 test method Methods 0.000 title claims description 12
- 239000002689 soil Substances 0.000 claims abstract description 127
- 239000000523 sample Substances 0.000 claims abstract description 53
- 238000010008 shearing Methods 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims description 16
- 230000000149 penetrating effect Effects 0.000 claims description 16
- 238000003825 pressing Methods 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 6
- 238000004836 empirical method Methods 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000012377 drug delivery Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- -1 modified phenolic aldehyde Chemical class 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011158 quantitative evaluation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- HOWHQWFXSLOJEF-MGZLOUMQSA-N systemin Chemical compound NCCCC[C@H](N)C(=O)N[C@@H](CCSC)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CC(O)=O)C(=O)OC(=O)[C@@H]1CCCN1C(=O)[C@H]1N(C(=O)[C@H](CC(O)=O)NC(=O)[C@H](CCCN=C(N)N)NC(=O)[C@H](CCCCN)NC(=O)[C@H](CO)NC(=O)[C@H]2N(CCC2)C(=O)[C@H]2N(CCC2)C(=O)[C@H](CCCCN)NC(=O)[C@H](CO)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@@H](NC(=O)[C@H](C)N)C(C)C)CCC1 HOWHQWFXSLOJEF-MGZLOUMQSA-N 0.000 description 1
- 108010050014 systemin Proteins 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
Abstract
The invention discloses a shear strength testing device and a shear strength and static cone penetration testing method thereof, comprising a base, a penetration system, a rotating system and a measuring system, wherein the penetration system is arranged on the base, the rotating system is connected with the penetration system, and the measuring system is connected with the rotating system; the measuring system comprises a probe rod and a conical head, one end of the probe rod is connected with the rotating system, and the other end of the probe rod is connected with the conical head; the cone head comprises a first cone head and a second cone head, and the first cone head and the second cone head are connected to the probe rod in a replaceable manner; an annular pressure gauge is arranged on the circumference of the middle part of the first conical head; the fan-shaped conical plates of the second conical head are uniformly and vertically arranged on the circumference of the conical head body; the invention can quickly and conveniently acquire the data of the cohesive force and the internal friction angle of the soil body on site; the problems that the traditional cross plate shearing test can only be used for measuring soft soil layers, can only measure cohesive force and has a narrow application range are effectively solved; the device has simple structure, small volume and convenient carrying and use.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a shear strength testing device and a shear strength and static cone penetration test method thereof.
Background
At present, the highway side slope disease treatment engineering has huge investment, and the effect evaluation of the side slope treatment measures of the finished engineering is just completed and accepted according to the current industry standard. After the operation, the treatment and protection measures are not "symptomatic drug delivery", whether the expected effect is achieved or not, and little research is done on the aspects of good or bad treatment effect and the like. Ecological slope protection is an emerging technology, mature design, construction and slope protection effect quantitative evaluation standards are not yet established at home and abroad, and along with the expansion of the application scale of ecological engineering slope protection, the encountered problems are more and more complex, and the problems are difficult to solve only depending on some construction experience; for example: the problem of the consumption of the reinforcing material is that too little can cause the instability of the slope; an excessive amount would result in waste and is not economical.
In the prior geotechnical engineering, the bearing capacity or landslide resistance of a soil body is generally evaluated by utilizing the shear strength of the soil body, such as the cohesive force and the internal friction angle of the soil body; the conventional in-situ penetration test (such as a cone dynamic penetration test) or load test can only acquire normal stress intensity data of soil, and cannot obtain the shear strength of the soil; the rectangular cross plate shear test is a simple and reliable in-situ test method for rapidly measuring the shear strength of a soil layer, but is only suitable for a clay layer in a coastal saturated soft soil area, and only can measure the cohesive force c of the soil body, and the internal friction angle of the soil body cannot be measuredThe value is limited in application range.
At present, no suitable geotechnical engineering exploration equipment exists in China, and the cohesive force c and the internal friction angle of the soil body can be quickly and conveniently obtained on siteEqual shear strength data; therefore, finding a simple and reliable shear strength equipment for in-situ determination of soil mass is a problem to be solved at present.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, the invention aims to provide a shear strength testing device and a shear strength and static cone penetration test method thereof, which can quickly and conveniently obtain soil mass on siteAnd the cohesion c and the internal friction angle of the soil bodyIs a data of (a) a data of (b).
In order to achieve the above purpose, the invention adopts the following technical scheme:
the shear strength testing device comprises a base, a penetration system, a rotation system and a measurement system, wherein the penetration system is arranged on the base, the rotation system is connected with the penetration system, and the measurement system is connected with the rotation system; the measuring system comprises a probe rod and a conical head, one end of the probe rod is connected with the rotating system, and the other end of the probe rod is connected with the conical head; the cone head comprises a first cone head and a second cone head, and the first cone head and the second cone head are connected to the probe rod in a replaceable manner; the first conical head is of a conical structure, and an annular pressure gauge is arranged on the circumference of the middle part of the first conical head; the second conical head comprises a conical head body and four identical fan-shaped conical plates, the shape and the size of the conical head body are identical to those of the first conical head, and the four identical fan-shaped conical plates are uniformly and vertically arranged on the circumference of the conical head body.
Further, the probe rod comprises an outer cylinder, a strain cylinder, a force guide rod, a strain gauge, a screw plug and a sphere; the outer cylinder is of a cylinder structure with two open ends, and one end of the outer cylinder is fixedly connected with the rotating system; the strain cylinder is coaxially arranged in the outer cylinder, is of a cylinder structure with one end closed and the other end open, and the closed end of the strain cylinder is close to the rotating system; the opening end of the strain cylinder is fixedly connected with the inner wall of the outer cylinder; the force guide rod is coaxially arranged in the strain cylinder, one end of the force guide rod is connected with the closed end of the strain cylinder through a sphere, and the other end of the force guide rod extends out of the outer cylinder; the screw plug is sleeved on the force guide rod and fixedly connected with the inner wall of the outer cylinder; the force guide rod is provided with an annular boss which is propped against the end face of the screw plug and is arranged close to the strain barrel; the strain gauge is arranged on the surface of the strain barrel, and the extending end of the force guide rod is fixedly connected with the conical head.
Further, the device also comprises a strain compensation sheet, wherein the strain compensation sheet is arranged on the wall of the strain barrel; the strain gauge comprises two strain gauges which are symmetrically arranged, the strain compensation gauge comprises two strain compensation gauges which are symmetrically arranged, and the strain gauge is connected with the strain compensation gauge by adopting four bridges.
Further, the penetrating system comprises a first motor, a first gear, a second gear, a transmission screw, a nut, an outer pipe and an inner pipe, wherein the first motor is arranged on the base, an output shaft of the first motor is connected with the first gear, and the second gear is meshed with the first gear; one end of the transmission screw is fixedly connected with the second gear, and the other end of the transmission screw is a free end; the nut is sleeved on the transmission screw, one end of the inner tube is fixedly connected with the nut, and the other end of the inner tube is connected with the rotating system; the outer pipe is sleeved on the outer side of the inner pipe, one end of the outer pipe is fixedly connected with the base, and the other end of the outer pipe is a free end; be provided with spacing boss on the inner wall of outer tube, spacing boss is parallel with the axis of outer tube, is provided with spacing recess on the outside circumference of nut, spacing recess and spacing boss cooperation are connected.
Further, the rotating system comprises a second motor, a third gear, a fourth gear, a rotating shaft and a drill chuck, wherein the second motor is fixedly connected with the penetrating system, an output shaft of the second motor is connected with the third gear, the fourth gear is meshed with the third gear, one end of the rotating shaft is connected with the fourth gear, and the other end of the rotating shaft is fixedly connected with the drill chuck.
Further, the outer shell and the annular end plate are of cylindrical barrel structures with two open ends, and the outer shell is sleeved on the outer sides of the penetration system, the rotation system and the measurement system; one end of the outer shell is fixedly connected with the base, and the other end of the outer shell is a free end; the annular end plate is flush with the free end of the outer shell and fixedly connected with the outer shell, and the annular end plate is perpendicular to the outer shell.
Further, the cone body of the cone head is internally provided with internal threads, and the cone head is fixedly connected with the rotating system by threads.
Further, BF350 type strain gauge was used as the strain gauge.
The invention also provides an in-situ shear strength testing method, which comprises the following steps:
step 1, mounting a first cone head on a probe rod, starting a penetration system, closing a rotation system, and pressing the first cone head into a preset depth through the penetration systemIn soil layer, measuring normal stress sigma of soil body with annular pressure gauge n ；
Step 2, closing the penetrating system, starting the rotating system, applying torque to the measuring system by using the rotating system under the condition that the measuring system is not loaded with vertical load, and measuring the maximum torque T 0 ，T 0 For measuring the inherent friction generated between the system and the soil layer;
step 3, detaching the first cone head, mounting the second cone head on the probe rod, and pressing the second cone head into a preset soil layer at the same position or a position deviating from 5-10cm in the step 1, wherein the pressing depth of the second cone head is the same as that of the first cone head; then closing the penetrating system, starting the rotating system, applying torque to the measuring system by utilizing the rotating system, rotating the second conical head to shear and destroy the soil body to form a conical destroyed surface, and resisting the maximum torque T of the torque by the soil body N ；
Step 4, obtaining shearing torque T=T of shearing soil body of the second cone head according to the steps 2 and 3 N -T 0 ；
Step 5, repeating the test on the same soil layer or side slope for multiple times to obtain multiple groups of sigma n And T N Values, using the formulaDetermining the value of an array tau; wherein H is the height of the soil layer shearing cone; θ is the angle corresponding to the axis of the cone tilt surface; τ is the shear stress;
step 6, utilizing coulomb formulaOr solving the cohesive force c and the internal friction angle of the soil body by an empirical method
The invention also provides a static cone penetration test method, which comprises the following steps:
step 1, mounting a first cone head on a probe rod, starting a penetration system, closing a rotation system, pressing the first cone head into a soil layer with a preset depth through the penetration system, and obtaining soil resistance and side friction force of the first cone head by utilizing strain data of a strain gauge on a strain cylinder;
and 2, analyzing the soil resistance and the side friction force received by the first cone head to obtain the physical and mechanical properties of the soil.
Compared with the prior art, the invention has the following beneficial effects:
the shear strength testing device is simple in structure, small in size and convenient to carry and use.
Further, through setting up the strain gauge in the probe rod, be provided with the foil gage on the strain gauge, realize the physical characteristic analysis to the regional soil texture of detection through the pressure data that obtains the foil gage, realized the function of static cone penetration, realized the effect that a device played multiple functions, filled the slope soil body parameter and can't the in situ test's blank.
Further, through setting up annular end plate at the tip of shell body, when using, annular end plate is hugged closely with domatic, has guaranteed that the awl head is perpendicular to penetrate in the soil body.
The invention also provides a method for testing the in-situ shear strength, which can quickly and conveniently obtain the cohesive force c and the internal friction angle of the soil body on siteData of (2); the method effectively solves the problems that the traditional cross plate shearing test can only be used for measuring soft soil layers, only can measure a single value of the cohesive force c and has a narrow application range.
The invention also provides a static cone penetration test method, which utilizes the quasi-static force of the device to press the cone probe into the soil at a constant penetration rate, and indirectly judges the physical and mechanical properties of the soil according to the measured soil resistance and side friction resistance of the cone head, thereby realizing the purpose of static cone penetration; the invention is suitable for flat areas and slope surfaces.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a testing device according to the present invention;
FIG. 2 is a schematic diagram of a penetration system in a test apparatus according to the present invention;
FIG. 3 is a schematic view of the structure of an outer tube in the testing device according to the present invention;
FIG. 4 is a schematic view of a nut structure in the testing device according to the present invention;
FIG. 5 is a schematic diagram of a measurement system in a test apparatus according to the present invention;
FIG. 6 is a schematic view of a first conical head in the testing device according to the present invention;
FIG. 7 is a schematic diagram of a second conical head in the testing device according to the present invention;
FIG. 8 is a schematic view of a screw plug structure in the testing device according to the present invention;
FIG. 9 is a schematic view of the annular end plate structure in the testing device according to the present invention;
FIG. 10 is a schematic side view of a conical head in a testing device according to the present invention;
FIG. 11 is a graph of shear stress versus normal stress for a soil layer.
The device comprises a base 1, a shell 2, a penetrating system 3, a rotating system 4, a measuring system 5, an annular end plate 6, a first motor 31, a first gear 32, a second gear 33, a transmission screw 34, a nut 35, an outer tube 36, an inner tube 37, a first handle 38, a limit groove 351 and a limit boss 361; 41 second motor, 42 third gear, 43 fourth gear, 44 spindle, 45 drill chuck, 46 second grip; 51 probe rod, 52 conical head, 511 outer cylinder, 512 strain drum, 513 force guide rod, 514 strain gauge, 515 strain compensation gauge, 516 screw plug, 517 sphere, 5131 annular boss; 521 first conical head, 522 second conical head, 5211 annular manometer, 5221 conical head body, 5222 fan-shaped conical plate.
Detailed Description
The technical solutions of the embodiments of the present invention will be explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present invention.
In the following description, the terms "inner", "outer", "upper", "lower", etc. are used to indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description of the embodiments and to simplify the operation, and do not indicate or imply that the apparatus or elements in question must have a specific orientation, be constructed and operated in a specific range, and thus should not be construed as limiting the present invention.
Referring to fig. 1, the invention relates to a static cone penetration and shear strength testing device, which comprises a base 1, an outer shell 2, a penetration system 3, a rotating system 4 and a measuring system 5, wherein the base 1 is arranged at the upper end of the outer shell 2, and the outer shell 2 is of a cylindrical structure; the penetrating system 3, the rotating system 4 and the measuring system 5 are all arranged in the outer shell 2, the penetrating system 3 is arranged on the base 1, the rotating system 4 is connected with the penetrating system 3, and the measuring system 5 is connected with the rotating system; the penetration system 3 is used for pushing the rotating system 4 and the measuring system 5 to slowly move forwards, the rotating system 4 is used for driving the measuring system 5 to rotate, and the measuring system 5 is used for testing the in-situ static sounding and shear strength of the soil body.
Referring to fig. 1 to 4, the penetration system 3 includes a first motor 31, a first gear 32, a second gear 33, a driving screw 34, a nut 35, an outer tube 36, an inner tube 37 and a first grip 38, the first motor 31 is fixedly installed on the base 1, the first gear 32 is fixedly connected to an output shaft of the first motor 31, and the second gear 33 is engaged with the first gear 32; the first gear 32 is a driving gear, and the second gear 33 is a reduction gear; the second gear 33 is fixedly sleeved at the upper end of the transmission screw 34, and the lower end of the transmission screw 34 is a free end; the nut 35 is sleeved on the drive screw 34, and when the first motor 31 rotates, the drive screw 34 is driven to rotate, and the nut 35 moves reversely and relatively along the drive screw 34, so that the nut 35 reciprocates up and down along the drive screw 34; the outer tube 36 is of a cylindrical barrel structure, the upper end of the outer tube 36 is fixedly connected with the base 1, the outer tube 36 is sleeved on the outer side of the inner tube 37, a limiting boss 361 is arranged in the outer tube 36, a limiting groove 351 is arranged on the outer cylinder of the nut 35, the limiting boss 361 is connected with the limiting groove 351 in a matched mode, and relative rotation with the outer tube 36 in the moving process of the nut 35 is prevented; the inner tube 37 is arranged in the outer tube 36, and a gap is arranged between the inner tube 37 and the outer tube 36; the upper end of the inner tube 37 is fixedly connected with the lower end surface of the nut 35, and the lower end of the inner tube 37 is fixedly connected with the rotating system 4; the first handle 38 is disposed at one side of the base 1, and a start switch of the first motor 31 is disposed on the first handle 38 for controlling the first motor 31 to be turned on or off.
Referring to fig. 1, the rotation system 4 includes a second motor 41, a third gear 42, a fourth gear 43, a rotation shaft 44, a drill chuck 45, and a second grip 46; the second motor 41 is fixedly connected with the inner tube 37, a third gear 42 is sleeved on the output shaft of the second motor 41, and a fourth gear 43 is meshed with the third gear 42; the third gear 42 and the fourth gear 43 are helical gears, the third gear 42 is a driving gear, and the fourth gear 43 is a driven gear; the upper end of the rotating shaft 44 is fixedly connected with the fourth gear 43, the lower end of the rotating shaft 45 is connected with the drill chuck 45, and the drill chuck 45 is used for being connected with the measuring system 5; the second grip 46 is disposed at the middle part of the outer side of the outer casing 2, and an on-off switch of the second motor 41 is disposed on the second grip 46 for controlling the on-off of the second motor 41.
Referring to fig. 5-8, the measuring system 5 comprises a probe rod 51 and a conical head 52, wherein the upper end of the probe rod 51 is connected with the drill chuck 46, and the lower end of the probe rod 52 is connected with the conical head; the probe rod 51 comprises an outer barrel 511, a strain barrel 512, a force guide rod 513, a strain gauge 514, a strain compensation gauge 515, a plug screw 516 and a ball 517; the outer barrel 511 is of a cylindrical barrel structure with two open ends, the upper end and the lower end of the outer barrel 511 are both provided with internal threads, and the upper end of the outer barrel 511 is in threaded connection with the drill chuck 46; the strain tube 512 is coaxially arranged in the inner cavity of the outer tube 511, the strain tube 512 is a cylinder body with an upper end closed and a lower end opened, and the closed end of the strain tube 512 is arranged close to the rotating system; the outside of the open end of the strain barrel 512 is provided with threads, the open end of the strain barrel 512 is connected with the inner wall of the lower end of the outer barrel 511 through threads, and the closed end of the strain barrel 512 is arranged close to the lower end of the outer barrel 511; coaxially disposed within strain tube 512 is a force-guiding rod 513, the upper end of force-guiding rod 513 being connected to the closed end of strain tube 512 by a ball 517.
The lower end of the force guide rod 513 extends out of the lower end of the outer barrel 511, a screw plug 515 is sleeved outside the force guide rod 513, and a gap is arranged between the screw plug 515 and the force guide rod 513; the screw plug 515 is provided with threads on the outer circumference, the screw plug 515 is fixedly connected with the inner wall of the lower end of the outer barrel 511 through the threads, the force guide rod 513 is also provided with an annular boss 5131, the end face of the annular boss 5131 is in abutting contact with the upper end face of the screw plug 515, the annular boss of the force guide rod 513 is clamped above the screw plug 515, and the screw plug 515 can prevent the force guide rod 513 from falling off from the strain barrel 512.
The circumference of the lower end of the force guide rod 513 is provided with external threads, an inner stepped hole is formed in the conical head 52, the lower half section of the inner stepped hole is provided with internal threads, and the force guide rod 513 is fixedly connected with the conical head 52 through threads; the upper half section of the inner stepped hole is provided with a positioning groove, the lower end face of the screw plug 515 is provided with a positioning boss, and the positioning boss of the screw plug 515 is matched with the positioning groove of the conical head 52.
The cone head 52 comprises a first cone head 521 and a second cone head 522, and the first cone head 521 and the second cone head 522 are connected to the probe 51 in a replaceable manner; the first conical head 521 is of a conical structure, and an annular pressure gauge 5211 is arranged on the circumference of the middle part of the first conical head 521; the second conical head 522 includes a conical head body 5221 and four identical fan-shaped conical plates 5222, the conical head body 5211 is identical to the first conical head 521 in shape and size, and the four identical fan-shaped conical plates 5222 are uniformly and vertically arranged on the circumference of the conical head body 5211.
Further, the lower extreme of shell body 2 still is provided with annular end plate 6, annular end plate 6 and shell body 2 lower extreme parallel and level and fixed connection, and annular plate 6 sets up with shell body 2 is perpendicular, and during the use, hugs closely annular plate and slope and sets up, guarantees that the probe penetrates in the soil perpendicularly.
The invention also provides a shear strength testing method, which specifically comprises the following steps:
step 1, mounting a first cone head on a probe rod, starting a penetration system, closing a rotation system, pressing the first cone head into a soil layer with a preset depth through the penetration system, and measuring the normal stress sigma of the soil body with the depth by using an annular pressure gauge n ；
Step 2, closing the penetrating system, starting the rotating system, and using the rotating system when the measuring system is in a state of not loading vertical loadMeasuring maximum torque T for measuring system applied torque 0 ，T 0 For measuring the inherent friction generated between the system and the soil layer;
step 3, detaching the first cone head, mounting the second cone head on the probe rod, and pressing the second cone head into a preset soil layer at the same position or a position deviating from 5-10cm in the step 1, wherein the pressing depth of the second cone head is the same as that of the first cone head; then closing the penetrating system, starting the rotating system, applying torque to the measuring system by utilizing the rotating system, rotating the second conical head to shear and destroy the soil body to form a conical destroyed surface, and resisting the maximum torque T of the torque by the soil body N ；
Step 4, obtaining shearing torque T=T of shearing soil body of the second cone head according to the steps 2 and 3 N -T 0 ；
Step 5, repeating the test on the same soil layer or side slope for multiple times to obtain multiple groups of sigma n 、T N Values, using the formulaDetermining the value of an array tau; wherein H is the height of the soil layer shearing cone; θ is the angle corresponding to the axis of the cone tilt surface; τ is the shear stress;
step 6, utilizing coulomb formulaOr solving the cohesive force c and the internal friction angle of the soil body by an empirical method
The calculation principle is as follows:
referring to fig. 10 and 11, the height of the soil layer shearing cone is H, and the sector micro area from the cone tip of the cone head to the position with the height H is considered, wherein the angle of the cone tip of the cone head is theta, namely the angle corresponding to the axis of the cone inclined plane of the cone head is theta; the distance from the conical tip of the conical head to the fan-shaped micro area at the position h is l;
the mathematical expression of the distance l from the conical tip of the conical head to the fan-shaped micro area at the height h is as follows:
thus, the minor area of the cone tip shear surface of the cone is:
let the shear stress acting on the minute area be τ, the torque acting on the minute area be t,
therefore, the mathematical relationship of τ and t acting on a tiny area is:
the torque T in the micro area is calculated in an integral way, and the shearing torque T of the second conical head for shearing soil mass is calculated:
the soil layer position is changed, and repeated measurement is carried out according to the steps of the operation method, so that a plurality of groups of different sigma can be obtained n And T N According to T N The value and the calculation formula can calculate the array shear stress tau;
referring to the drawings11, according to the obtained array normal stress sigma n And shear stress τ, σ n The cross axis is drawn by tau as the vertical axis, the intercept and the slope on the slope can be calculated, the intercept is the cohesive force c of the soil body, and the slope is
It is also possible to use the molar-coulomb intensity formula:obtaining cohesive force c and internal friction angle +.>
The present invention will be described in further detail below.
The invention relates to a shear strength testing device which comprises a base 1, an outer shell 2, a penetration system 3, a rotation system 4, a measuring system 5 and an annular end plate 6, wherein the base is provided with a plurality of holes;
the penetrating system 3 is an electric push rod, the penetrating system 3 comprises a first motor 31, the first motor 31 is connected with a first gear 32, the first gear 32 is connected with a second gear 33, a transmission screw 34 is connected to the second gear 33, a nut 35 is connected to the transmission screw 34, the first motor 31 is arranged on the base 1, the base 1 is fixedly connected with the upper end of the outer shell 2, the nut 35 is fixedly connected with an inner tube 37, and when the first motor 31 drives the transmission screw 34 to rotate, the nut 35 and the transmission screw 34 relatively move, in particular, reciprocate between the upper position and the lower position of the transmission screw 34; for nut 35, it reciprocates between an initial position and an extreme position; for the whole penetration system 3, the inner tube 37 and the outer tube 36 are relatively moved, so that the rotation system 4 and the measuring system 5 are pushed to slowly move forward.
The limiting boss 361 of the outer tube 36, which is disposed along the axial direction of the outer tube 36, is cooperatively connected with the limiting groove 351 of the nut 35, preventing the nut 35 from rotating during the up-and-down movement of the drive screw 34.
The rotation system 4 mainly comprises a second motor 41, a third gear 42, a fourth gear 43, a rotating shaft 44 and a drill chuck 45; an output shaft of the second motor is connected with a third gear 42, the third gear 42 is a driving bevel gear, the third gear 42 is meshed with a fourth gear 43, the fourth gear 43 is a driven bevel gear, the fourth gear 43 is fixed on a rotating shaft 44, and the lower end part of the rotating shaft 44 is connected with a drill chuck 45.
The annular end plate 6 is arranged at the lower end of the outer shell 2, and when in use, the annular end plate 6 can be clung to the slope surface, so that the cone head 52 can vertically penetrate into the soil.
A first motor starting switch is arranged on the first grip 38, and controls the penetrating system 3 to enable an inner pipe 37 in the penetrating system to stretch up and down, so as to drive the cone head 52 to stretch up and down; the first grip 46 is provided with a second motor start switch, and the second motor start switch controls the rotating system 4, so that the rotating system 4 rotates to drive the cone 52 to rotate.
The measuring system 5 comprises a probe rod 51 and a cone 52; the probe rod 51 includes an outer barrel 511, a strain barrel 512, and a force guide rod 513; the outer cylinder 511 is a cylinder with two open ends, the upper and lower ends of the inner cylinder wall of the outer cylinder 511 are provided with internal threads, and the strain cylinder 513 is arranged in the inner cavity of the outer cylinder 511; the strain tube 512 is a cylindrical body with one end closed and the other end open, and an external thread matching with the internal thread of the inner tube wall of the outer tube 511 is provided on the outer circumferential surface of the open end of the strain tube 512; the wall of the strain drum 512 is provided with a strain gauge 514; the force guide rod 513 is a cylinder, external threads are arranged on the outer peripheral surface of the lower end of the force guide rod 513, and the thread section of the lower end of the force guide rod 513 extends out of the outer cylinder 511 and the strain cylinder 127; the conical head 52 is provided with an inner stepped hole, and the lower half part of the inner stepped hole is an inner threaded hole; the conical head 52 is arranged below the outer cylinder 511, and the conical head 511 is fixed at the lower end of the force guide rod 513 in a way that an internal threaded hole of the conical head 511 is matched with a threaded section at the lower end of the force guide rod 513; the lower end of the outer cylinder 511 is provided with a screw plug 516, and the lower surface of the annular boss 5131 of the force guide rod 513 abuts against the upper end surface of the screw plug 126.
The wall of the strain drum 512 is also provided with a strain compensation sheet 515; two strain gages and two strain compensators are provided on the wall of the strain tube 512. Strain gauge 514 is attached to the surface of strain drum 513, and strain gauge 514 is used to measure small changes in strain drum 512, calculate the drag and side friction of cone 52, and perform the function of static cone penetration.
The strain tube 512 is arranged in the outer tube 511 and is connected with the outer tube 511 in a matched manner through threads, the external threads at the lower end of the strain tube 512 are matched with the internal threads at the lower part of the outer tube 511, and the opening end of the strain tube 512 is downward; the upper half part of the force guide rod 513 extends into the inner cavity of the strain barrel 512, and one part of the lower half part is positioned in the inner cavity of the outer barrel and the other part extends out of the outer barrel; the part of the force guide rod 513 extending out of the outer cylinder is a threaded section of the force guide rod 513, and the threaded section of the force guide rod 513 is matched with the internal thread of the conical head 52, so that the conical head 52 can be fixed with the force guide rod 513.
The screw plug 516 is screwed into the lower end of the outer barrel 511, and the screw plug 516 is matched with the inner thread of the lowest end of the outer barrel 511. The force-guiding rod 513 also passes through the screw plug 516, the annular boss 5131 of the force-guiding rod 513 is just clamped on the upper end face of the screw plug 516, and the screw plug 516 can prevent the force-guiding rod 513 from falling out of the strain barrel 512. The lower half of the plug 516 is inserted into the larger diameter bore of the upper half of the inner stepped bore of the bit 52.
In the test, first, the first cone 521 is mounted on the lower end of the guide rod 513, the first motor start switch is started, the first probe 521 is slowly pressed into the soil body by the penetration system 3, and the pressing is stopped after the specified depth is reached.
When the first cone 521 enters the soil body and receives the thrust of the foundation soil, the thrust is transmitted to the force guide rod 513 through the first cone 521, the force guide rod 513 is transmitted to the strain barrel 512 through the ball 517, so that the thrust of the foundation soil received by the first cone 521 is changed into the tensile stress of the strain barrel 512, the barrel wall of the strain barrel 512 generates tiny strain under the action of the tensile stress, the tiny strain is in the elastic strain range of the strain barrel 512, the strain is changed into linear strain, and the strain gauge 514 converts the tiny strain into resistance transformation and transmits data to a computer; the computer analyzes the signals and converts the signals into data of soil pressure and frictional resistance, and staff can analyze the physical characteristics of the soil in the area through the data of the soil pressure.
At the same time, at the first conical headThe annular pressure gauge 5211 is arranged in the middle of the device, so that the average soil pressure of the soil body acting on the first cone 521, namely the normal stress of the soil body, can be obtained; at a specified depth below the slope table, the normal stress sigma of the soil body at the depth is recorded by an annular pressure gauge 5211 n 。
Then, the first motor starting switch is turned off, the second motor starting switch is turned on, the measuring system 5 slowly applies torque to the probe rod 51 by using the rotating system 4 under the condition of no vertical load, the probe rod 51 drives the first cone 521 to rotate, and the maximum torque T is measured by the rotating speed of the second motor 41 0 ，T 0 Is an inherent friction force generated between the first cone 521 and the soil layer;
next, the first cone head 521 is removed, the second cone head 522 is mounted on the lower end of the force guiding rod 513, the second cone head 522 is pressed into the soil layer at the same position or at a position deviated from 5 to 10cm in the previous step, the pressing in is stopped when the depth of the soil layer pressed in by the second cone head 522 is the same as the pressing in degree of the first cone head, torque is applied to the second cone head 522 by the rotation system 4, the second cone head is rotated to shear and destroy the soil body to form a cone-shaped destroy surface, and the maximum torque T of the soil body resisting torque is measured by the rotation speed of the second motor 41 N ；
Then, calculating the shearing torque T=T of the second shearing soil body of the sector conical plate probe N -T 0 ；
Secondly, repeating the steps, repeating the test for a plurality of times on the same soil layer or side slope to obtain a plurality of groups of sigma n 、T N Values, using the formulaDetermining the value of an array tau; wherein H is the height of the soil layer shearing cone; θ is the angle corresponding to the axis of the cone tilt surface; τ is the shear stress;
then, using coulomb formulaOr solving the cohesive force c and the internal friction angle of the soil body by an empirical method>
In the invention, the middle cone head 52 and the probe rod 51 are made of low-carbon alloy steel materials; the strain gage 514 is a BF350 strain gage, and the base 1 is made of modified phenolic aldehyde; the probe rod adopts a fully-closed structure, so that temperature self-compensation and creep self-compensation can be realized at the same time.
The strain gauge 514 and the strain compensation gauge 515 are of a four-bridge design, the strain gauge 514 is used for measuring small changes of the strain drum 512, and soil resistance and side friction resistance of the cone head 52 are calculated, so that a static cone penetration function is realized. The strain compensation sheet 515 is used for parameter compensation, the strain sheet 514 is a strain sensor, and the strain compensation sheet 515 is a parameter compensation sheet.
The miniaturized conical head of the invention eliminates the thick and bulky traditional probe, thus greatly improving the working efficiency. The whole weight of the cone head-formed sounding equipment can be controlled to be about 10kg, and the cone head-formed sounding equipment is far lighter than that of the existing 2T-3T portable static sounding machine and the existing manual small-thread drill, and is portable, rapid and index-weighted.
The invention provides a shear strength test method, which can be used for quickly and simply measuring the shear strength of a soil layer in situ, and effectively solves the problems that the traditional cross plate shear test can only be used for measuring a soft soil layer, and can only be used for measuring a single value of cohesive force c, so that the application range is narrow.
Meanwhile, in the test process, parameters such as side friction resistance of the soil body can be measured, and the function of static cone penetration test is realized. The invention also provides a static cone penetration test method, which specifically comprises the following steps:
step 1, mounting a first cone head on a probe rod, starting a penetration system, closing a rotation system, pressing the first cone head into a soil layer with a preset depth through the penetration system, and obtaining soil resistance and side friction force of the first cone head by utilizing strain data of a strain gauge on a strain cylinder;
and 2, analyzing the soil resistance and the side friction force received by the first cone head to obtain the physical and mechanical properties of the soil.
The device provided by the invention has multiple functions, is small in size, light in weight and convenient to carry, and is beneficial to testing on a slope surface. The invention has small volume and convenient operation, can simultaneously obtain the shear strength parameter of soil body and realize the function of static cone penetration, and fills the blank that the soil body parameter of the slope can not be tested in situ.
The static cone penetration test is a very important in-situ test for geotechnical engineering investigation, a cone probe is pressed into soil through a series of probe rods at a constant penetration rate by using quasi-static force, and the physical and mechanical properties of the soil are indirectly judged according to the measured resistance and side friction resistance of the soil body born by the cone head. Static sounding can divide soil layers, evaluate engineering characteristics of foundation soil, search and determine pile foundation bearing layers, estimate pile sinking possibility of driven piles and test the compactness of manual filling soil, foundation reinforcement effect and the like of single pile bearing capacity.
However, the existing static cone penetration test instrument has large volume and weight, can only perform the test in a relatively flat area, and cannot perform the static cone penetration test on the slope surface according to the existing equipment condition.
Most soil body failures are shear failures, and the shear failures basically obey Mohr-Coulomb, M-C criteria for short, such as the unsteady sliding of a side slope, which is represented by the fact that the self sliding force of the sliding body of the side slope is larger than the shear failures caused by the maximum sliding resistance exerted by the sliding surface of the side slope, and the maximum sliding resistance exerted by the sliding surface can be obtained by the M-C criteria according to the actual sliding condition.
In the M-C rule, two shear strength parameters, namely cohesive force and internal friction angle, are included, the magnitudes of the two parameters represent the shear capacity of the soil body and reflect the reliability of the shear failure of the soil body structure, so that the acquisition of the shear strength parameters is a basic condition for analyzing the shear damage of the soil body and provides a basis for accurately preventing the shear damage of the soil body and predicting the shear damage range of the soil body.
In order to obtain M-C shear strength parameters of soil, an original soil sample is usually collected from an actual engineering point on site, then the collected original soil sample is remolded indoors, a plurality of groups of standard soil samples capable of being subjected to direct shearing or triaxial shearing tests are prepared, shear strength when the soil is subjected to shearing damage under different normal stress states is obtained through the test by transforming the compression conditions of the soil samples, and then M-C strength curves are adopted for fitting test results in a Cartesian coordinate system of normal stress and shear strength, so that the M-C strength parameters are obtained.
However, in the process of preparing the remolded standard soil sample, disturbance is generated on the original state of the soil sample, so that certain differences exist between the original soil sample and the remolded standard soil sample in stress state, water content and self structure of soil body, and therefore the M-C shear strength parameter of the remolded standard soil sample obtained through indoor test is difficult to truly reflect the shear strength characteristic of the original soil sample. Meanwhile, because the standard soil sample needs to be prepared in the existing indoor test method, the test operation process is complicated, and the operation proficiency of the preparation personnel has a certain influence on the prepared soil sample performance. In addition, for the stability of the soil body under shear damage control, such as the anti-slip stability of a side slope, the main factor influencing the analysis result is often the accuracy of the selection of the shear strength parameter, if the shear strength parameter does not accord with the actual condition of the engineering, the calculated result may be exaggerated or conservatively estimated, thereby bringing adverse hidden trouble to the engineering or causing uneconomical engineering optimization design.
Claims (7)
1. The shear strength testing device is characterized by comprising a base (1), a penetration system (3), a rotating system (4) and a measuring system (5), wherein the penetration system (3) is arranged on the base (1), the rotating system (4) is connected with the penetration system (3), and the measuring system (5) is connected with the rotating system (4); the measuring system (5) comprises a probe rod (51) and a conical head (52), one end of the probe rod (51) is connected with the rotating system (4), and the other end of the probe rod (51) is connected with the conical head (52); the cone head (52) comprises a first cone head (521) and a second cone head (522), and the first cone head (521) and the second cone head (522) are connected to the probe rod (51) in a replaceable manner; the first conical head (521) is of a conical structure, and an annular pressure gauge (5211) is arranged on the circumference of the middle part of the first conical head (521); the second conical head (522) comprises a conical head body (5221) and four identical fan-shaped conical plates (5222), the shape and the size of the conical head body (5221) are identical to those of the first conical head (521), and the four identical fan-shaped conical plates (5222) are uniformly and vertically arranged on the circumference of the conical head body (5221);
the probe rod (51) comprises an outer cylinder (511), a strain cylinder (512), a force guide rod (513), a strain gauge (514), a screw plug (516) and a ball (517); the outer cylinder (511) is of a cylinder structure with two open ends, and one end of the outer cylinder (511) is fixedly connected with the rotating system (4); the strain cylinder (512) is coaxially arranged in the outer cylinder (511), the strain cylinder (512) is of a cylinder structure with one end closed and one end open, and the closed end of the strain cylinder (512) is arranged close to the rotating system (4); the opening end of the strain cylinder (512) is fixedly connected with the inner wall of the outer cylinder (511); the force guide rod (513) is coaxially arranged in the strain drum (512), one end of the force guide rod (513) is connected with the closed end of the strain drum (512) through a ball (517), and the other end of the force guide rod (513) extends out of the outer drum (511); the screw plug (516) is sleeved on the force guide rod (513), and the screw plug (516) is fixedly connected with the inner wall of the outer barrel (511); an annular boss (5131) is arranged on the force guide rod (513), the annular boss (5131) is propped against the end face of the screw plug (516), and the annular boss (5131) is arranged close to the strain barrel (512); the strain gauge (514) is arranged on the surface of the strain barrel (512), and the extending end of the force guide rod (513) is fixedly connected with the conical head (52);
the penetration system (3) comprises a first motor (31), a first gear (32), a second gear (33), a transmission screw (34), a nut (35), an outer tube (36) and an inner tube (37), wherein the first motor (31) is arranged on the base (1), an output shaft of the first motor (31) is connected with the first gear (32), and the second gear (33) is meshed with the first gear; one end of the transmission screw (34) is fixedly connected with the second gear (33), and the other end of the transmission screw (34) is a free end; the nut (35) is sleeved on the transmission screw (34), one end of the inner tube (37) is fixedly connected with the nut (35), and the other end of the inner tube (37) is connected with the rotating system (4); the outer tube (36) is sleeved on the outer side of the inner tube (37), one end of the outer tube (36) is fixedly connected with the base (1), and the other end of the outer tube (36) is a free end; a limiting boss (361) is arranged on the inner wall of the outer tube (36), the limiting boss (361) is parallel to the axis of the outer tube (36), a limiting groove (351) is arranged on the outer circumference of the nut (35), and the limiting groove (351) is connected with the limiting boss (361) in a matching way;
the rotation system (4) comprises a second motor (41), a third gear (42), a fourth gear (43), a rotating shaft (44) and a drill chuck (45), wherein the second motor (41) is fixedly connected with the penetration system (3), an output shaft of the second motor (41) is connected with the third gear (42), the fourth gear (43) is meshed with the third gear (42), one end of the rotating shaft (44) is connected with the fourth gear (43), and the other end of the rotating shaft (44) is fixedly connected with the drill chuck (45).
2. The shear strength testing device according to claim 1, further comprising a strain compensation plate (515), the strain compensation plate (515) being arranged on a wall of the strain barrel (512); the strain gauge (514) comprises two strain gauges which are symmetrically arranged, the strain compensation gauge (515) comprises two strain compensation gauges which are symmetrically arranged, and the strain gauge (514) and the strain compensation gauge (515) are connected through four bridges.
3. The shear strength testing device according to claim 1, wherein the outer shell (2) and the annular end plate (6) are of a cylindrical structure with two open ends, and the outer shell (2) is sleeved outside the penetration system (3), the rotation system (4) and the measurement system (5); one end of the outer shell (2) is fixedly connected with the base (1), and the other end of the outer shell (2) is a free end; the annular end plate (6) is flush with the free end of the outer shell (2) and fixedly connected, and the annular end plate (6) is perpendicular to the outer shell (2).
4. The shear strength testing device according to claim 1, wherein the conical body of the conical head (52) is provided with internal threads, and the conical head (52) is fixedly connected with the rotating system (4) by threads.
5. A shear strength testing device according to claim 1, wherein the strain gauge (514) is a BF350 type strain gauge.
6. A method of testing shear strength, characterized in that it comprises the following steps, by means of a shear strength testing device according to any one of claims 1-5:
step 1, mounting a first cone head on a probe rod, starting a penetration system, and closing rotationThe system presses the first cone head into a soil layer with a preset depth through the penetration system, and the normal stress sigma of the soil body with the preset depth is measured by using an annular pressure gauge n ；
Step 2, closing the penetrating system, starting the rotating system, applying torque to the measuring system by using the rotating system under the condition that the measuring system is not loaded with vertical load, and measuring the maximum torque T 0 ，T 0 For measuring the inherent friction generated between the system and the soil layer;
step 3, detaching the first cone head, mounting the second cone head on the probe rod, and pressing the second cone head into a preset soil layer at the same position or a position deviating from 5-10cm in the step 1, wherein the pressing depth of the second cone head is the same as that of the first cone head; then closing the penetrating system, starting the rotating system, applying torque to the measuring system by utilizing the rotating system, rotating the second conical head to shear and destroy the soil body to form a conical destroyed surface, and resisting the maximum torque T of the torque by the soil body N ；
Step 4, obtaining shearing torque T=T of shearing soil body of the second cone head according to the steps 2 and 3 N -T 0 ；
Step 5, repeating the test on the same soil layer or side slope for multiple times to obtain multiple groups of sigma n And T N Values, using the formulaDetermining the value of an array tau; wherein H is the height of the soil layer shearing cone; θ is the angle corresponding to the axis of the cone tilt surface; τ is the shear stress;
step 6, utilizing coulomb formulaOr solving the cohesive force c and the internal friction angle of the soil body by an empirical method>
7. A static cone penetration test method, characterized in that the shear strength test device according to any one of claims 1, 2 or 5 is used, comprising the following steps:
step 1, mounting a first cone head on a probe rod, starting a penetration system, closing a rotation system, pressing the first cone head into a soil layer with a preset depth through the penetration system, and obtaining soil resistance and side friction force of the first cone head by utilizing strain data of a strain gauge on a strain cylinder;
and 2, analyzing the soil resistance and the side friction force received by the first cone head to obtain the physical and mechanical properties of the soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910351683.8A CN109991103B (en) | 2019-04-28 | 2019-04-28 | Shear strength testing device and shear strength and static cone penetration test method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910351683.8A CN109991103B (en) | 2019-04-28 | 2019-04-28 | Shear strength testing device and shear strength and static cone penetration test method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109991103A CN109991103A (en) | 2019-07-09 |
| CN109991103B true CN109991103B (en) | 2024-04-12 |
Family
ID=67135419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910351683.8A Active CN109991103B (en) | 2019-04-28 | 2019-04-28 | Shear strength testing device and shear strength and static cone penetration test method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109991103B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111473769A (en) * | 2020-05-27 | 2020-07-31 | 中铁第四勘察设计院集团有限公司 | Rock-soil settlement measuring probe, probe assembly, device and measuring method |
| CN111829870B (en) * | 2020-07-09 | 2021-05-18 | 广州海洋地质调查局 | Static sounding testing device in sampling pipe |
| CN113702211B (en) * | 2021-10-27 | 2022-01-04 | 成都理工大学 | Hole wall lateral expansion rotary shearing device for drilling shearing test and testing method |
| CN115078129B (en) * | 2022-08-16 | 2022-11-11 | 成都理工大学 | Hole bottom shearing instrument and rock-soil body shear strength testing method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2931285B1 (en) * | 1998-02-03 | 1999-08-09 | 国際航業株式会社 | Penetration test method and device |
| JP2003149066A (en) * | 2001-11-12 | 2003-05-21 | Kajima Corp | Intrusion sensor for intrusion test |
| CN104535488A (en) * | 2014-12-24 | 2015-04-22 | 河南理工大学 | Device and method for in-situ measuring cohesive force and internal friction angle of slightly hard soil layer |
| CN105928803A (en) * | 2016-07-15 | 2016-09-07 | 中南大学 | Soil shear strength parameter in-situ test apparatus and test method thereof |
| CN209858359U (en) * | 2019-04-28 | 2019-12-27 | 长安大学 | Shear strength testing arrangement |
-
2019
- 2019-04-28 CN CN201910351683.8A patent/CN109991103B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2931285B1 (en) * | 1998-02-03 | 1999-08-09 | 国際航業株式会社 | Penetration test method and device |
| JP2003149066A (en) * | 2001-11-12 | 2003-05-21 | Kajima Corp | Intrusion sensor for intrusion test |
| CN104535488A (en) * | 2014-12-24 | 2015-04-22 | 河南理工大学 | Device and method for in-situ measuring cohesive force and internal friction angle of slightly hard soil layer |
| CN105928803A (en) * | 2016-07-15 | 2016-09-07 | 中南大学 | Soil shear strength parameter in-situ test apparatus and test method thereof |
| CN209858359U (en) * | 2019-04-28 | 2019-12-27 | 长安大学 | Shear strength testing arrangement |
Non-Patent Citations (1)
| Title |
|---|
| 应用静力触探技术分析土石坝软基抗滑稳定性;于沭;陈凯;陈祖煜;徐泽平;邓刚;;水利水电技术(第03期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109991103A (en) | 2019-07-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109991103B (en) | Shear strength testing device and shear strength and static cone penetration test method thereof | |
| WO2018006585A1 (en) | Multi-functional true triaxial rock drilling test system and method | |
| CN105938070B (en) | Multi-functional true triaxial rock drilling test macro and the test method for characterizing rock mass characteristic | |
| CN209858359U (en) | Shear strength testing arrangement | |
| CN108918819B (en) | Multi-parameter micro test device for simulating dry-wet cycle and use method thereof | |
| US20210396637A1 (en) | Portable soil mass in-situ shear test device and test method thereof | |
| WO2010072133A1 (en) | On-site detector for foundation bearing capacity and filling compactness | |
| CN202544844U (en) | Tester for determining rock drillability and drilling parameter sensitivity | |
| CN101250866A (en) | Method for rapidly testing in situ foundation bearing capacity and deformation modulus | |
| CN208239220U (en) | Shear tester in hole in situ | |
| CN112730231B (en) | Test device and determination method for measuring tangential adhesion of soil and solid interface | |
| CN111650085A (en) | Portable soil body normal position density tester | |
| CN105510163B (en) | A kind of soil penetration resistance measurement apparatus | |
| CN214224906U (en) | Test device for measuring tangential adhesion of soil and solid interface | |
| CN108519257B (en) | Method and device for preparing root-containing soil sample and detecting shear strength | |
| CN111139812B (en) | Static sounding device and method for geotechnical geological exploration | |
| CN117191601A (en) | Hole wall spinning shearing device for in-situ drilling shearing test and test method | |
| CN205062789U (en) | Portable T type sounding appearance | |
| WO2019240716A2 (en) | An apparatus and a method for soil survey involving continuity | |
| CN110186780A (en) | A kind of high-precision borehole shear test apparatus and method | |
| CN213689229U (en) | Metal plate anti-deformation performance testing device | |
| CN211735334U (en) | Intelligent miniature T-shaped sounding instrument | |
| JP4115216B2 (en) | In-hole vertical loading test method and apparatus | |
| CN210322636U (en) | High-precision drilling shearing testing device | |
| CN112924311A (en) | Method for detecting compressive strength of concrete by using electric energy consumed by drilling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |