CN113702211A - Hole wall lateral expansion rotary shearing device for drilling shearing test and testing method - Google Patents
Hole wall lateral expansion rotary shearing device for drilling shearing test and testing method Download PDFInfo
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- 238000010008 shearing Methods 0.000 title claims abstract description 167
- 238000012360 testing method Methods 0.000 title claims abstract description 65
- 238000005553 drilling Methods 0.000 title claims abstract description 30
- 238000010998 test method Methods 0.000 title claims abstract description 9
- 239000000523 sample Substances 0.000 claims abstract description 99
- 238000009434 installation Methods 0.000 claims abstract description 12
- 239000002689 soil Substances 0.000 claims description 92
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 45
- 238000000034 method Methods 0.000 claims description 23
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- 230000005540 biological transmission Effects 0.000 claims description 19
- 230000002706 hydrostatic effect Effects 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 9
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- G—PHYSICS
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- 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
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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Abstract
The hole wall lateral expansion rotary shearing device for the drilling shearing test and the test method comprise an installation assembly, a lifting assembly and a shearing assembly for a supporting device; the lifting assembly is used for driving the shearing assembly to lift; the shearing assembly comprises a drill rod and a power device which is used for driving the drill rod to rotate and is detachably connected with one end of the drill rod; the shearing unit comprises a first probe head part and a second probe head part which is arranged below the first probe head part and connected with the first probe head part; the expansion pipe penetrates through the first probe part and extends into the second probe part; the expansion pipe is connected with a normal force providing device; the surface of the second probe part is provided with a plurality of shear slices arranged along the radial direction of the second probe part; the shearing sheets are arranged in an array, and the shearing sheets on the same straight line along the radial direction of the second probe part form a group; the positions of the shearing sheets in the two adjacent groups of shearing sheets are arranged in a staggered way; the surface of the second probe part between the two adjacent groups of the shearing sheets is provided with opening positions distributed along the radial direction of the second probe part; the invention can realize the side pressure test and the shear test, and has good stress performance.
Description
Technical Field
The invention relates to the technical field of drilling shearing test devices, in particular to a hole wall lateral expansion rotary shearing device and a hole wall lateral expansion rotary shearing method for a drilling shearing test.
Background
The shear strength index of rock-soil mass is an important parameter for researching mechanical property of soil mass and carrying out engineering design. The index can be measured by a laboratory test or an in-situ test method. The traditional indoor test comprises means such as direct shear test, triaxial test and the like, but the sample size of the indoor test has limitation, and the representativeness is poor due to disturbance and strict limitation of boundary conditions in the transportation process; although the in-situ test does not need sampling, the shear strength index of the rock-soil body can be directly measured in the original stress environment, but the in-situ test also has a plurality of limiting factors, such as a large-scale direct shear test on site, the measured result is more accurate, but the test time is long, and the cost is high; the cross plate shearing experiment has larger error for uneven soil layers, particularly for soft clay with thin fine silt or silt; the accuracy of soil body strength parameters obtained by a standard penetration experiment and a static sounding experiment is difficult to ensure; the drilling shearing test has short period and relatively low cost, but the current common equipment comes from abroad, the purchase cost is high, the experimental effect of the drilling shearing test in homogeneous soil is good, and the experimental effect of the drilling shearing test in heterogeneous soil is poor.
The borehole shear test (RBST) is one of various in-situ test methods for field investigation, and provides a direct measurement method for the shear strength parameters of rock and soil mass. The experimental principle is that the shearing tool bit in the equipment under the hole is pressed into the soil body on the wall of the hole, the pressure is normal stress, the normal stress is regarded as effective positive stress, and then the shearing tool bit is provided with uplifting force, so that the soil body is sheared. The shear stress corresponding to the shearing damage of the soil body corresponding to different normal stresses can be obtained by changing the normal stress applied to the rock-soil body, and the shear strength index of the rock-soil body at a specific depth can be obtained according to the molar-coulomb strength criterion. The drilling shearing instrument used at present is a Phytometre drilling shearing instrument developed by French APAGEO company, and needs to work in drilling holes with small diameters (60-66 mm), but the hole opening aperture commonly seen in China is more than 90mm, in order to meet the working conditions of the drilling shearing instrument abroad, extra holes are often needed, and the cost is increased; the borehole shearing instrument can only test the shear strength parameter of the soil body, but cannot obtain other parameters such as elastic deformation parameter and the like; the instrument has good test effect in homogeneous soil and soft rock, and has poor test effect in soil with complex conditions such as gravel soil and the like.
The cross plate shear test (VST) is to measure the resistance moment of soil when it is damaged by twisting at a certain speed with a standard cross plate probe inserted into soil, and to measure the shear strength and residual shear strength of the non-drainage shear of soil. The cross plate shear test can be used for measuring saturated soft cohesive soilφ0) non-draining shear strength and sensitivity. The measured shear strength value is equivalent to the non-drainage shear strength of the natural soil layer solidified under the in-situ pressure at the test depth. The cross plate shear test does not need to adopt a soil sample, avoids the disturbance of the soil sample and the change of the natural stress state, and is an effective test method for measuring the non-drainage strength of the soil on site. In the existing cross plate shearing test, a relatively accurate soil body shear strength value can be obtained only by shearing a soil body at a uniform speed by the cross plate, so that a rotary turntable needs to be manually rotated at a uniform speed on the ground surface, and the precision of a test result is greatly influenced by subjectivity and operation factors; due to the design limitation of the cross plate when the cross plate participates in shearing, the result obtained by testing in homogeneous soil is relatively accurate.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a hole wall lateral expansion rotary shearing device and a hole wall lateral expansion rotary shearing method for simultaneously carrying out a shearing test and a lateral pressure test.
The technical scheme adopted by the invention is as follows:
a hole wall lateral expansion rotary shearing device for a drilling shearing test comprises a shearing assembly, a pressure and volume control device and a motion control device, wherein the pressure and volume control device is used for controlling and measuring the pressure of an expansion pipe and the volume of liquid in the expansion pipe; the shearing assembly comprises a connecting rod and a shearing unit, one end of the connecting rod is connected with the motion control device, and the other end of the connecting rod is connected with the shearing unit;
the shearing unit comprises a first probe head part and a second probe head part which is arranged below the first probe head part and connected with the first probe head part; the upper part of the first probe part is connected with a connecting rod; the expansion pipe penetrates through the first probe part and extends into the second probe part;
the surface of the second probe part is provided with a plurality of shear slices distributed along the radial direction of the second probe part; the shearing sheets are arranged in an array, and the shearing sheets on the same straight line along the radial direction of the second probe part form a group; the positions of the shearing sheets in the two adjacent groups of shearing sheets are arranged in a staggered way; and opening positions distributed along the radial direction of the second probe part are arranged on the surface of the second probe part between the two adjacent groups of shear slices.
Further, the motion control device comprises a hydraulic jack connected with the connecting rod; the hydraulic motor is connected with the output end of the hydraulic motor, and the first gear is meshed with the second gear; the second gear is arranged on the connecting rod.
Further, the pressure and volume control device comprises a gas cylinder provided with a pressure reducing valve; the measuring cylinder is connected with the expansion pipe and used for containing and measuring the volume of the liquid; a liquid valve is arranged between the measuring cylinder and the expansion pipe, and an air valve is arranged between the measuring cylinder and the air bottle; and the gas pressure meter is used for measuring the pressure in the expansion pipe.
Further, the motion control device comprises a mounting assembly for supporting the device, a lifting assembly and a rotating assembly for driving the shearing assembly to rotate; the lifting assembly comprises a motor and a driving rod driven by the motor; the lifting part is in transmission connection with the driving rod; the lifting part is driven by the driving rod to lift; the power device is arranged in the lifting part and moves up and down along with the lifting part so as to drive the connecting rod to lift; a limiting block is arranged at one end of the driving rod, which is far away from the second belt pulley; the outer surface of the driving rod is provided with an external thread, and an internal thread matched with the external thread is arranged in the transmission seat; the outer surface of the handle is provided with an anti-slip sleeve; the installation box is provided with an access cover, and the access cover is provided with a handle.
Furthermore, the mounting assembly comprises a support frame and a mounting box which is arranged at the upper part of the support frame and is detachably connected with the support frame; a handle is detachably connected to one side of the mounting box, which is far away from the support frame; the lifting part is connected with the fixed sleeve in a sliding manner;
the motor is arranged in the installation box; the output end of the motor is connected with the first belt pulley and also comprises two second belt pulleys; the two second belt pulleys are both in transmission connection with the first belt pulley; each second belt pulley is connected with a driving rod; the fixed sleeve is arranged between the two driving rods; the lifting part comprises a lifting block sliding along the fixed sleeve; the lifting part also comprises a lifting sleeve sleeved outside the fixed sleeve; the lifting sleeve is connected with the lifting block through a sliding rod; a through groove is formed in the corresponding position of the fixed sleeve, and the sliding rod slides in the through groove; the lifting part also comprises two transmission seats fixedly connected to two sides of the lifting sleeve, and the two transmission seats are respectively in transmission connection with the two driving rods.
Furthermore, the power device comprises a gyrator for driving the connecting rod to rotate and a hydraulic chuck rotationally connected with the gyrator; the gyrator is connected with the output end of the second motor, and the hydraulic chuck is detachably connected with the connecting rod; the power device is arranged in the installation shell, and the installation shell is arranged on the lifting sleeve.
Further, the cutting piece comprises a cutting part, a first connecting part and a second connecting part which are connected in sequence; the shearing part is of a wedge-shaped structure; the second connecting part is connected with the surface of the second probe part, and the outer side of the second connecting part is of an arc structure; the shearing edge angle was 60 °.
Further, the projections of the two adjacent groups of shear slices on the central shaft of the second probe part are overlapped; first probe portion and second probe portion are hollow cylindrical structure, and first probe portion external diameter is greater than second probe portion external diameter, and first probe portion and the slow transition of second probe portion junction diameter.
The test method of the hole wall lateral expansion rotary shearing device for the drilling shearing test comprises the following steps:
step 1: drilling and checking an instrument; calibrating the shearing unit to obtain the water injection amount in the expansion pipe (360)VAnd standard pressurePThe relationship betweenP=f(V)；
Step 2: placing the shear module in the borehole at a predetermined test position z, opening a fluid valve in the pressure and volume control device, whereupon hydrostatic pressure is built up in the shear unitP w Recording the water level drop value in the measuring cylinder until the expansion pipe is filled with water, and reading the measuring cylinder asV 1The water level drop value is the inherent volume of the expansion pipeV c ；
And step 3: opening the air valve, and pressurizing step by step through a pressure reducing valve; reading corresponding pressure value under each stage of pressure to obtain increment delta of water pressure in the expansion pipepRecording the height of change of water level in the measuring cylinder under the corresponding set pressure, i.e. the volume increment delta in the expansion pipeV(ii) a Recording the value of the measuring cylinder at the moment of initiationV 2And the value of the cylinder at the moment of terminationV 3；
And 4, step 4: starting the motion control device to drive the connecting rod to rotate; recording the torque of the shearing unit from the beginning of rotation to the shearing of the damaged soilM i ；
And 5: calculating the side compression mold amount of rock and soil massG M ：
In the formula:V c the inherent volume of the expansion tube is expanded for the shear unit,V m is the average volume of the shear cell expansion tube;
step 6: calculating the normal stress of the soil shear surfaceσ i ：
In the formula:pin order to achieve the corrected pressure, the pressure is,p m the reading of the pressure gauge when the shearing unit rotates,p w the pressure is the hydrostatic pressure, and the pressure is the hydrostatic pressure,p i is the elastic membrane restraining force;
the hydrostatic pressure calculation method is as follows:
when no underground water exists:
when underground water exists:
wherein,P w the pressure is the hydrostatic pressure, and the pressure is the hydrostatic pressure,h 0the height of the water surface of the burette from the hole opening,zthe depth from the ground to the side pressure test point,H w the burial depth of the underground water level to the orifice,γ w is the severity of the water;
and 7: calculation and Normal stressσ i Corresponding shear stressτ i ：
In the formula:Din order to be the diameter of the shearing face of the shearing unit,hin order to cut the height of the unit,M i in order to be the torque, the torque is,πis the circumferential ratio;
and 8: repeating the steps 2-7 for 4-6 times at different positions of the same soil layer; according to the normal stress and the shear stress of the soil shear surface obtained by the test, the internal friction angle and the cohesion of the soil can be calculated by adopting a least square method;
and step 9: and after the test is finished, closing the device, and cleaning to finish the test.
Further, the torque in the step 4M i The calculation method is as follows:
in the formula:P an inletIn order to provide the inlet pressure of the hydraulic motor,P an outletIn order to control the outlet pressure of the hydraulic motor,V d in order to rotate the displacement of the hydraulic motor,ηthe working efficiency of the hydraulic motor is improved.
The invention has the beneficial effects that:
(1) according to the rock-soil mass shearing device, the shearing unit is pressed into soil by using the expansion pipe, and then the shearing unit is rotated to shear the rock-soil mass; measuring corresponding data in the lateral pressing and rotating processes to obtain a shear strength parameter and an elastic deformation parameter;
(2) the invention drives the shearing assembly to move up and down through the lifting assembly; the hydraulic chuck is driven to rotate through the gyrator, and the connecting rod is further driven to rotate; thereby driving the shearing unit to carry out shearing operation in the soil layer and realizing the shearing operation in the coarse-grained soil;
(3) according to the invention, the second connecting part at the bottom of the shear slice enables the stress performance of the shear slice during soil shearing to be better, and the shear slice is more difficult to damage;
(4) according to the invention, the shear slices are regularly arranged, and the projections of two adjacent groups of shear slices on the central shaft of the second probe part are overlapped, so that the shearing process is carried out, and the overall mechanical property of the shear slices is better;
(5) the structure of the shearing unit can enable the shearing sheet to be fully embedded into the soil body under the action of the expansion pipe, and the stress performance of the joint of the first probe head and the second probe head can be better due to the design of the first probe head and the second probe head.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic structural diagram of a pressure and volume control device according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a motion control device according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a mounting assembly according to an embodiment of the invention.
FIG. 7 is a cross-sectional view of an embodiment of the present invention.
Fig. 8 is a schematic diagram of a partial explosion structure in an embodiment of the present invention.
FIG. 9 is a schematic view of the shear assembly of the present invention.
Fig. 10 is an exploded view of a connecting member according to an embodiment of the present invention.
Fig. 11 is a schematic cross-sectional view of a connecting member according to an embodiment of the invention.
Fig. 12 is a front view of a shearing unit in the present invention.
Fig. 13 is a top view of a shearing unit of the present invention.
FIG. 14 is a schematic view of the structure of a shear slice according to the present invention.
In the figure: 100-mounting component, 110-supporting frame, 120-mounting box, 121-access cover, 1211-handle, 130-handle, 131-anti-slip sleeve, 140-fixing sleeve, 141-through groove, 200-lifting component, 210-motor, 220-first belt pulley, 230-second belt pulley, 240-driving rod, 241-external thread, 242-limiting block, 250-lifting part, 251-lifting block, 2511-sliding rod, 252-lifting sleeve, 253-driving seat, 2531-internal thread, 260-mounting shell, 300-shearing component, 310-rotator, 320-hydraulic chuck, 330-connecting rod, 340-first probe part, 341-hollow female head, 350-second probe part, 351-shearing piece, 3511-a shearing part, 3512-a first connecting part, 3513-a second connecting part, 352-an opening position, 360-an expansion pipe, 400-a connecting component, 410-a first connecting head, 411-a clamping groove, 412-a rotating groove, 420-a fixed seat, 430-a gear, 440-a rack, 450-a rotating sleeve, 451-a rotating block, 460-a threaded rod, 470-a second connecting head, 471-a clamping strip, 500-a pressure and volume control device, 510-an air bottle, 520-a pressure reducing valve, 530-a measuring cylinder, 540-an air pressure gauge, 550-an air valve, 560-a liquid valve, 570-a water injection pipe, 600-a motion control device, 610-a bracket, 620-a hydraulic jack, 630-a hydraulic motor, 640-a rotary encoder and 650-a first gear, 660-second gear, 670-hydraulic pipe, 680-hydraulic oil pump.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in fig. 1, the hole wall lateral expansion rotary shearing device for the borehole shear test comprises a shearing assembly 300, a pressure and volume control device 500 for controlling and measuring the pressure of an expansion pipe 360 and the volume of liquid in the expansion pipe 360, and a motion control device 600 for controlling and measuring the motion of the shearing assembly 300; the cutting assembly 300 includes a connecting rod 330 and a cutting unit, and one end of the connecting rod 330 is connected to the motion control device 600 and the other end is connected to the cutting unit. The shearing unit and the connecting rod 330 adopt a mode of threaded connection of a male head and a female head, and are convenient to disassemble. The upper part of the shearing unit is a female head, and one end of the connecting rod 330 is a male head.
The cutting unit includes a first probe portion 340 and a second probe portion 350 disposed thereunder to be connected thereto; the upper part of the first probe part 340 is connected with the connecting rod 330; further comprising an expansion tube 360 extending through the first probe portion 340 and into the second probe portion 350; the surface of the second probe part 350 is provided with a plurality of shear slices 351 distributed along the radial direction; the shear slices 351 are arranged in an array, and the shear slices 351 on the same straight line along the radial direction of the second probe part 350 form a group; the positions of the shearing sheets 351 in the two adjacent groups of shearing sheets 351 are arranged in a staggered manner; between two adjacent groups of the cutting sheets 351, the surface of the second probe part 350 is provided with opening positions 352 distributed along the radial direction. A hollow female head 341 is arranged in the first probe part 340, and the hollow female head 341 is detachably mounted on the male head of the connecting rod 330. The hollow female head 341 and the male head of the connecting rod 330 can be quickly installed and connected, and then the shearing operation can be performed.
The normal force in this device is provided by a pressure and volume control device 500, the shear unit being hollow inside. The force to rotate the sheared soil is provided by the motion control apparatus 600.
Before lowering the shearing unit to the depth to be measured, the expansion pipe 360 is placed in the shearing unit on the ground surface, then the connecting rods 330 are added section by section along the drilled hole, and the connecting rods 330 at the top are connected with the motion control device 600 after the depth to be measured is reached. And then normal pressure is provided for the shearing unit by the pressure and volume control device to cut the shear slice into the soil body. The soil is rotationally sheared under the action of the motion control device 600. After the test is finished, the normal force and the spinning pressure loaded on the shearing unit are completely relieved, and then the connecting rod 330 is lifted section by section through the motion control device 600.
The pressure and volume control device 500 as shown in fig. 2 comprises a gas cylinder 510 provided with a pressure reducing valve 520; a measuring cylinder 530 connected with the expansion tube 360 and used for containing and measuring the liquid volume; a liquid valve 560 is arranged between the measuring cylinder 530 and the expansion pipe 360, and a gas valve 550 is arranged between the measuring cylinder and the gas cylinder 510; a barometer 540 is also included for measuring the pressure within the inflation tube 360. The device mainly participates in the process of cutting the shearing unit into the soil body, when a test is started, the liquid valve 560 is opened, water in the measuring cylinder 530 flows into the expansion pipe 360 along the water injection pipe 570, the expansion pipe 360 is filled with water, no pressure difference is generated in the measuring cylinder 530 and the expansion pipe 360 at the moment, and no force for extruding the shearing unit is generated in the expansion pipe 360 at the moment. The gas valve 550 is then opened, the pressure relief valve 520 on the gas cylinder 510 is opened, and gas pressure is applied to the cylinder 530, which "squeezes" the water in the cylinder 530 through the fill tube 570 and into the expansion tube 360. The expansion tube 360 is gradually expanded and the corresponding portion of the shear blade 351 is expanded until cutting into the soil. After the soil mass is cut by rotation, the pressure reducing valve 520 is closed to stop providing air pressure, the air valve 550 is closed, and the normal force applied to the cutting unit is completely relieved. Under the action of atmospheric pressure, the water in the expansion pipe 360 returns to the measuring cylinder 530 through the water injection pipe 570. After stabilization, the liquid valve 560 is closed, the shear unit is pulled to the ground, and the expansion tube 360 is removed to complete the test.
As shown in fig. 3, the motion control means 600 includes a hydraulic jack 620 connected to the connecting rod 330; the hydraulic motor 630 is further included, the output end of the hydraulic motor 630 is connected with the first gear 650, and the first gear 650 is meshed with the second gear 660; the second gear 660 is provided on the connecting rod 330. The hydraulic jack 620 and the hydraulic motor 630 are connected to a hydraulic oil pump 680 through a hydraulic pipe 670. The hydraulic jack 620 is arranged on the support 610, the hydraulic motor 630 is arranged on the connecting rod, and the support is arranged below the hydraulic motor 630 and used for arranging the rotary encoder 640. The part participates in the process of cutting the shear blade 351 on the shearing assembly 300 into the soil body and then rotating and shearing the soil body, and the process of placing the shearing assembly 300 to the part to be tested and lifting the shearing assembly 300 out of the hole after the test.
The rotation speed can be obtained by monitoring the real-time rotation speed by a rotary encoder 640 fixed to a first gear 650 coupled to the hydraulic motor 630 at one side of the hydraulic motor 630. The hydraulic motor 630 drives the second gear 660 to rotate through the first gear 650, so as to drive the connecting rod 330 to rotate, and further drive the shearing unit to rotate; the bracket 610 may be fixed with the hydraulic jack 620, and the hydraulic motor 630 may be fixed on the connecting rod 330 through the bracket, or may be fixed separately by the bracket. The hydraulic motor 630 drives the first gear 650 and simultaneously drives the rotary encoder 640 to synchronously rotate, so that the rotating speed can be measured through the rotary encoder 640, and the rotating speed can be controlled through the output power of the hydraulic motor 630. In this embodiment, the connecting rod 330 may be multi-sectioned, and the connecting rods may be lengthened by screwing, until the depth to be measured, and the inside of the connecting rod is hollow, so as to ensure that the water injection pipe 570 is connected to the expansion pipe 360. At the end of the test, the connecting rod 330 can be lifted up section by applying an upward lifting force to the shearing unit through the connecting rod 330. The rod lifting process is similar to the process of lifting the drill rod after the program control is drilled in the engineering. Where hydraulic jack 620 is controlled by a valve provided on hydraulic oil pump 680 and hydraulic motor 630 is controlled by a valve provided on hydraulic oil pump 680. The motion control device 600 described above is only one way to achieve the object of the present invention, and other ways may be adopted.
As shown in fig. 4 to 11, the motion control device 600 includes a mounting assembly 100 for supporting the device, a lifting assembly 200, and a rotating assembly for rotating the shearing assembly 300; the lifting assembly 200 comprises a motor 210 and a driving rod 240 driven by the motor 210; the lifting part 250 is in transmission connection with the driving rod 240; the lifting part 250 is driven by the driving rod 240 to lift; the power device is disposed inside the elevating part 250 and moves up and down along with the elevating part 250, thereby driving the connecting rod 330 to ascend and descend. The speed and depth of penetration of the shearing unit into the earth is controlled by motor 210.
The motor 210 is arranged in the installation box 120; the output end of the motor 210 is connected with the first belt pulley 220 and also comprises two second belt pulleys 230; the two second belt pulleys 230 are both in transmission connection with the first belt pulley 220; each second pulley 230 is connected with a driving rod 240; the fixed sleeve 140 is disposed between the two drive rods 240; the elevating part 250 includes an elevating block 251 sliding along the fixing sleeve 140; the lifting part 250 further comprises a lifting sleeve 252 sleeved outside the fixed sleeve 140; the lifting sleeve 252 is connected with the lifting block 251 through a sliding rod 2511; a through groove 141 is formed in the corresponding position of the fixing sleeve 140, and the sliding rod 2511 slides in the through groove 141; the lifting part 250 further comprises two transmission seats 253 fixedly connected to two sides of the lifting sleeve 252, and the two transmission seats 253 are respectively in transmission connection with the two driving rods 240. A stop block 242 is disposed at an end of the driving rod 240 away from the second pulley 230. The stopper 242 prevents the elevating portion 250 from being separated from the driving rod 240, thereby causing unnecessary loss. The outer surface of the driving rod 240 is provided with an external thread 241, and the interior of the driving seat 253 is provided with an internal thread 2531 matched with the external thread 241. This structure may allow the elevating part 250 to move up and down on the fixing sleeve 140 by the driving rod 240. And then the transmission seat 253 can drive the lifting sleeve 252 to move while moving up and down, and drive the lifting block 251 to move. The sliding rod 2511 slides on the through groove 141 of the fixing bushing 140.
The mounting assembly 100 comprises a support frame 110 and a mounting box 120 which is arranged at the upper part of the support frame 110 and is detachably connected with the support frame; a handle 130 is detachably connected to one side of the installation box 120 away from the support frame 110; the lifting part 250 is slidably connected with the fixed sleeve 140, and the fixed sleeve 140 is fixedly connected with the bottom of the installation box 120 (which can be fixedly connected by welding or connected by other methods). The outer surface of the handle 130 is provided with an anti-slip sleeve 131; an access cover 121 is provided on the installation case 120, and a handle 1211 is provided on the access cover 121. The anti-slip sleeve 131 is used for increasing the friction force between the handle 130 and the hand, and preventing the handle 130 from being manually grabbed due to vibration generated when the device works. A handle 1211 on the access cover 121 is secured by welding, the handle 1211 facilitating easy removal of the access cover 121. The provision of the access cover 121 facilitates maintenance of the internal components, and when maintenance is required, the handle 1211 is pulled to detach the access cover 121 from the mounting box 120, thereby allowing direct maintenance work.
In order to facilitate the disassembly and assembly of the mounting assembly, a connection assembly 400 is provided. The connecting assembly 400 includes a first connector 410, a holder 420, a gear 430, a rack 440, a rotary sleeve 450, a threaded rod 460, and a second connector 470. The first connector 410 is fixedly connected to one side of the mounting box 120 close to the support bracket 110 by welding. The fixing base 420 is fixedly connected to the first connector 410, the gear 430 is rotatably connected to the fixing base 420, and the rack 440 is engaged with and driven by the first connector 410. The threaded rod 460 is in transmission connection with the gear 430, and one end of the second connector 470 is fixedly connected with the threaded rod 460. The other end of the second connector 470 is fixedly connected to the support bracket 110 by welding. Further, the device can be controlled manually and stably, and the shearing operation is more smooth.
The first connector 410 is provided with a clamping groove 411, the second connector 470 is fixedly connected with a clamping strip 471, the clamping strip 471 can be clamped in the clamping groove 411, and the rotating sleeve 450 is fixedly connected with a rotating block 451. The first connector 410 is provided with a rotating groove 412, the rotating block 451 is rotatably connected in the rotating groove 412, and when the second connector 470 is close to the first connector 410, the clamping strip 471 of the second connector 470 is tightly clamped in the clamping groove 411 of the first connector 410, so as to achieve quick installation and further connection and fixation.
The power device comprises a gyrator 310 for driving the connecting rod 330 to rotate and a hydraulic chuck 320 rotationally connected with the gyrator 310; the gyrator 310 is connected with the output end of a second motor (the second motor can be adopted here or can be directly connected with the output end of the motor), and the hydraulic chuck 320 is detachably connected with the connecting rod 330; the power device is arranged in the mounting shell 260, and the mounting shell 260 is arranged on the lifting sleeve 252.
As shown in fig. 12 to 14, the cutting blade 351 includes a cutting portion 3511, a first connecting portion 3512, and a second connecting portion 3513 connected in this order; the shearing part 3511 is of a wedge-shaped structure; the second connecting part 3513 is connected with the surface of the second probe part 350, and the outer side of the second connecting part is of an arc structure; the cutting edge angle of the cutting portion 3511 was 60 °. The height of the shear slice 351 is 18.5mm along the direction vertical to the surface of the second probe part 350; wherein the cut portion 3511 is 3.5mm, the first connecting portion 3512 is 10mm, and the second connecting portion 3513 is 5 mm. Each of the shear blades 351 resembles the shape of a "tooth bite". That is, the cutting portion 3511 is wedge-shaped, the cutting blade 351 is edged at the top end, and the cutting edge angle is 60 °. The second connecting portion 3513 is similar to a 'wall of a photovoltaic' structure, the shearing sheet 351 can be fully embedded into a soil body under the action of the expansion tube in the probe, the stress performance is better when the soil body is sheared, and the shearing sheet 351 is more difficult to damage. While also facilitating the transfer of force between adjacent sets of shear blades 351.
The projections of the two adjacent groups of shear slices 351 on the central axis of the second probe part 350 are overlapped; the width of the overlapped part is 1mm in the embodiment, the design is favorable for the shearing process, and the shearing performance of the two adjacent groups of shearing sheets 351 in the spinning shearing process is improved.
The first probe part 340 and the second probe part 350 are both hollow cylindrical structures, the outer diameter of the first probe part 340 is larger than that of the second probe part 350, and the diameter of the joint of the first probe part 340 and the second probe part 350 is in slow transition. The first probe portion 340 has an outer diameter of 70mm and an inner diameter of 54 mm; the second probe portion 350 has an outer diameter of 61mm and an inner diameter of 45 mm; the opening position 352 has an opening width of 2mm, a thickness of 8mm and a length of 440 mm. The design is beneficial to the stress performance of the position. The first probe part 340 and the second probe part 350 are hollow inside, so that on one hand, the connecting rod is convenient to connect, and on the other hand, the expansion pipe 5 can be placed in the shearing unit. The distance between the end of the opening 352 and the lower end of the first probe portion 340 is 50 mm. Stress concentrations are most likely to occur at the beginning of the vertical opening, so the diameter of the probe head is designed.
The shearing sheets 351 are six groups, the interval between the shearing sheets 351 in the same group is 25mm, and the distance between the shearing sheets 351 corresponding to the adjacent two groups of the shearing sheets 351 is 33 mm. The corresponding opening positions 352 correspond to 6, and the vertical opening, namely the opening positions 352 divide the main body of the cutting unit 6 into 6 vertical curved pieces with equal size. The vertical opening enables the vertical curved piece to expand downwards under the action of the expansion pipe, and the upper part of the vertical opening is close to the lower part of the first probe part 340. The shearing unit is a middle-section slotted pipe body with blades vertically and uniformly distributed, and the shearing blade 351 is arranged in the middle of the second probe head part 350. The shear blade 351 can be ensured to be fully embedded into the soil body after being expanded.
The test method of the hole wall lateral expansion rotary shearing device for the drilling shearing test comprises the following steps:
step 1: drilling and inspectingChecking an instrument; calibrating the shearing unit to obtain the water injection amount in the expansion pipe 360VAnd standard pressurePThe relationship betweenP=f(V) (ii) a During the drilling process, attention is paid to the fact that the hole wall cannot be disturbed or disturbance is reduced as much as possible, whether instruments, water pipes and the like are connected correctly is checked, and the shearing unit is calibrated after all the instruments, the water pipes and the like are checked to be normal.
Step 2: the shear module 300 is placed in the borehole at the predetermined test position z by the motion control device 600, and the fluid valve 560 in the pressure and volume control device 500 is opened, at which time hydrostatic pressure is generated in the shear cellp w The drop in water level in the measuring cylinder 530 is recorded until the expansion tube 360 is filled with water, the reading of the measuring cylinder beingV 1The water level drop value is the inherent volume of the expansion pipeV c ；
And step 3: opening the gas valve 550, and pressurizing step by step through the pressure reducing valve 520; reading corresponding pressure value under each stage of pressure to obtain increment delta of water pressure in the expansion pipepRecording the height of change in water level in the measuring cylinder 530 at the corresponding set pressure, i.e. the increase in volume Δ in the expansion tubeV(ii) a Record the value of the measuring cylinder 530 at the start timeV 2And the value of the cylinder 530 at the end of the timeV 3。
The process requires control of the stabilization time under each stage of pressure to ensure that the shear blade 351 can cut into the soil completely and the cut soil has sufficient time to solidify. For soft rock, weathered rock, gravel soil and the like, 1min is preferably adopted, and for unsaturated cohesive soil, silt soil, sandy soil and the like, 2min is preferably adopted. When the relative stability time standard of 1min is adopted for the gravel soil, the readings of the water level of the measuring cylinder 530 of 15s, 30s and 60s are measured and read under each stage of pressure, and the next stage of pressure is applied after the reading of 60s is finished until the shear blade 351 completely cuts into the soil body. When the relative stability time standard of 2min is adopted, the water level drop values of the measuring cylinders 530 of 15s, 30s, 60s and 120s are measured and read under each stage of pressure, and the next stage of pressure is applied after the reading of 2min is finished until the shear blade 351 completely cuts into the soil body.
And 4, step 4: starting the motion control device 600 to drive the connecting rod 330 to rotate; thereby driving the shearing unit embedded in the soil body to rotate slowly. In the process canThe rotation speed thereof is reduced by a reduction gear provided on the hydraulic motor 630. The shearing unit rotates and shears the soil body at a relatively slow rotating speed. The torque of the shearing unit from the beginning of rotating to the shearing of the damaged soil body can be recorded in real time through the rotary encoder and the pressure sensorM i 。
And 5: calculating the side compression mold amount of rock and soil massG M ：
In the formula:V c the inherent volume of the expansion tube is expanded for the shear unit,V m the average volume of the shear cell expansion tube is,V 0 the volume of the expanded tube at the start of step 3,V f the tube volume is expanded for the termination time in step 3.
Step 6: calculating the normal stress of the soil shear surfaceσ i ：
In the formula:pin order to achieve the corrected pressure, the pressure is,p m the reading of the pressure gauge when the shearing unit rotates,p w the pressure is the hydrostatic pressure, and the pressure is the hydrostatic pressure,p i is the elastic membrane restraining force; forming an elastic membrane restraining force correction curve according to the elastic membrane restraining force correction curve in the step 1 (taking different points for testing), namelyVAndPcurve of relationship between)P=f(V) And (4) determining.
The hydrostatic pressure calculation method is as follows:
when no underground water exists:
when underground water exists:
wherein,p w is the hydrostatic pressure, in kPa,h 0the height of the water surface of the burette from the hole opening is m,zis the depth from the ground to the side pressure test point, and the unit is m,H w the buried depth from the underground water level to the orifice is m,γ w is the water gravity with the unit of kN/m3；
And 7: calculation and Normal stressσ i Corresponding shear stressτ i ：
In the formula:Din order to be the diameter of the shearing face of the shearing unit,hin order to cut the height of the unit,M i in order to be the torque, the torque is,πis the circumferential ratio;
and 8: repeating the steps 2-7 for 4-6 times at different positions of the same soil layer; according to the normal stress and the shear stress of the soil shear surface obtained by the test, the internal friction angle and the cohesion of the soil can be calculated by adopting a least square method;
and 7: and after the test is finished, closing the device, and cleaning to finish the test.
Torque ofM i The calculation method is as follows:
in the formula:P an inletIn order to provide the inlet pressure of the hydraulic motor,P an outletIn order to control the outlet pressure of the hydraulic motor,V d in order to rotate the displacement of the hydraulic motor,ηthe working efficiency of the hydraulic motor is improved.
When the device structure of another embodiment of the invention is used, a connecting rod 330 with a proper type is firstly installed on the hydraulic chuck 320, and then the support frame 110 is fixed at a designated position. The handle 130 is manually held, the motor 210 is then started, the first pulley 220 rotates along with the motor 210, and the second pulley 230 is driven to rotate by the first pulley 220. Further, the elevating unit 250 moves up and down along the driving rod 240, and the mounting case 260 moves up and down. Thereby driving the gyrator 310 and the hydraulic chuck 320 to move up and down. The connecting rod 330, the first probe part 340 and the second probe part 350 are driven to be pressed into the soil. When shearing operation is carried out, the second motor provides power for the gyrator 310, the hydraulic chuck 320 rotates under the driving of the gyrator 310, and then the first probe part 340, the second probe part 350 and the expansion pipe 360 are enabled to carry out shearing operation in a soil layer, and the shearing operation in coarse soil is achieved. The second motor can be set up alone or can share a motor, and specific model can according to needs actual selection.
The shearing unit is a core component of the drilling shearing device. The pressure and volume control device 500 provides a normal force to the expansion tube within the shear unit by controlling the pressure therein. The shearing unit is pressed into the soil through the expansion pipe 360 and then is driven to twist at a certain uniform speed through the motion control device 600; after the shearing unit is pressed into the soil body, the soil body is radially deformed, and the elastic modulus of the soil body of the drilled hole can be tested by measuring data in the process by a sensor; the rotation of the shearing unit can measure the resisting moment when the soil is damaged in the process through a sensor, and the shearing strength parameter of the soil is obtained through conversion. The second connecting portion of shear blade bottom makes the atress performance of shear blade when shearing the soil body better, and shear blade self is more difficult to damaged. The shearing sheets are regularly arranged, and the projections of two adjacent groups of shearing sheets on the central shaft of the second probe part are overlapped, so that the shearing process is carried out, and the overall rational performance of the shearing sheets is better. The structure of the shearing unit can enable the shearing sheet to be fully embedded into the soil body under the action of the expansion pipe, and the stress performance of the joint of the first probe head and the second probe head can be better due to the design of the first probe head and the second probe head.
In addition, when the existing shearing device shears coarse soil, operation and control are generally carried out manually, and after a descending probe drills into a coating, manual control force is not enough to control a drilling machine, so that the accuracy of monitoring data and the depth of a soil body to be measured are limited. The device is required to be installed on the drilling machine to assist the manual work to control and stabilize the drilling machine, but the device is relatively complex when the drilling machine is installed, and the overall working efficiency can be affected when the device is installed. The present invention solves this problem.
The practical use proves that the device can work in the common drilling holes with the hole diameter of 90 mm-95 mm in China, and the cost of drilling is reduced. Besides the shear strength parameter of the soil body can be calculated after measurement, the lateral pressure modulus of the soil body can also be obtained. The shearing unit part can be tested in coarse-grained soil, particularly in gravel soil through design, and the conditions that the instrument is possibly clamped and cannot be sheared and the like are fully considered, and the conditions are all reflected in the design. The test has higher automation degree, and particularly, the motion control device can replace manpower to control the shearing unit to rotate and shear, thereby reducing the influence of subjective factors of manual operation.
Claims (10)
1. A hole wall lateral expansion rotary shearing device for a drilling shearing test is characterized by comprising a shearing assembly (300), a pressure and volume control device (500) for controlling and measuring the pressure of an expansion pipe (360) and the volume of liquid in the expansion pipe (360), and a motion control device (600) for controlling and measuring the motion of the shearing assembly (300); the shearing assembly (300) comprises a connecting rod (330) and a shearing unit, one end of the connecting rod (330) is connected with the motion control device (600), and the other end of the connecting rod is connected with the shearing unit;
the shearing unit comprises a first probe head part (340) and a second probe head part (350) which is arranged below the first probe head part and connected with the first probe head part; the upper part of the first probe part (340) is connected with a connecting rod (330); the expansion pipe (360) penetrates through the first probe head part (340) and extends into the second probe head part (350);
the surface of the second probe part (350) is provided with a plurality of shearing sheets (351) distributed along the radial direction of the second probe part; the shear slices (351) are arranged in an array mode, and the shear slices (351) on the same radial straight line of the second probe part (350) form a group; the positions of the shear slices (351) in the two adjacent groups of shear slices (351) are arranged in a staggered manner; and opening positions (352) distributed along the radial direction of the second probe part (350) are arranged on the surface of the second probe part between two adjacent groups of the shearing sheets (351).
2. The hole wall bulging rotary shearing device for the borehole shear test as recited in claim 1, wherein said motion control means (600) comprises a hydraulic jack (620) connected to a connecting rod (330); the hydraulic motor (630) is further included, the output end of the hydraulic motor (630) is connected with the first gear (650), and the first gear (650) is meshed with the second gear (660); the second gear (660) is disposed on the connecting rod (330).
3. A hole wall swelling rotary shearing device for borehole shear testing according to claim 2, wherein said pressure and volume control means (550) comprises a gas cylinder (510) provided with a pressure relief valve (520); a measuring cylinder (530) connected with the expansion pipe (360) and used for containing and measuring the liquid volume; a liquid valve (560) is arranged between the measuring cylinder (530) and the expansion pipe (360), and a gas valve (550) is arranged between the measuring cylinder and the gas cylinder (510); also included is a barometer (540) for measuring pressure within the expansion tube (360).
4. The hole wall lateral expansion rotary shearing device for the drilling shear test is characterized in that the motion control device (600) comprises a mounting assembly (100) for a supporting device, a lifting assembly (200) and a rotating assembly for driving the shearing assembly (300) to rotate; the lifting assembly (200) comprises a motor (210) and a driving rod (240) driven by the motor (210); the lifting part (250) is in transmission connection with the driving rod (240); the lifting part (250) is driven by the driving rod (240) to lift; the power device is arranged in the lifting part (250) and moves up and down along with the lifting part (250) so as to drive the connecting rod (330) to lift; a limiting block (242) is arranged at one end of the driving rod (240) far away from the second belt pulley (230); the outer surface of the driving rod (240) is provided with an external thread (241), and an internal thread (2531) matched with the external thread (241) is arranged in the transmission seat (253); the outer surface of the handle (130) is provided with an anti-slip sleeve (131); an access cover (121) is arranged on the mounting box (120), and a handle (1211) is arranged on the access cover (121).
5. The hole wall lateral expansion rotary shearing device for the drilling shear test is characterized in that the mounting assembly (100) comprises a support frame (110), a mounting box (120) which is arranged at the upper part of the support frame (110) and is detachably connected with the support frame (110); a handle (130) is detachably connected to one side, far away from the support frame (110), of the installation box (120); the lifting part (250) is connected with the fixed sleeve (140) in a sliding manner;
the motor (210) is arranged in the installation box (120); the output end of the motor (210) is connected with the first belt pulley (220) and also comprises two second belt pulleys (230); the two second belt pulleys (230) are in transmission connection with the first belt pulley (220); each second belt pulley (230) is connected with a driving rod (240); the fixed sleeve (140) is arranged between the two driving rods (240); the lifting part (250) comprises a lifting block (251) sliding along the fixed sleeve (140); the lifting part (250) also comprises a lifting sleeve (252) sleeved outside the fixed sleeve (140); the lifting sleeve (252) is connected with the lifting block (251) through a sliding rod (2511); a through groove (141) is formed in the corresponding position of the fixed sleeve (140), and the sliding rod (2511) slides in the through groove (141); the lifting part (250) further comprises two transmission seats (253) fixedly connected to two sides of the lifting sleeve (252), and the two transmission seats (253) are in transmission connection with the two driving rods (240) respectively.
6. The hole wall bulging rotary shearing device for the drilling shearing test is characterized in that the power device comprises a gyrator (310) for driving a connecting rod (330) to rotate and a hydraulic chuck (320) in rotary connection with the gyrator (310); the gyrator (310) is connected with the output end of the second motor, and the hydraulic chuck (320) is detachably connected with the connecting rod (330); the power device is arranged in the mounting shell (260), and the mounting shell (260) is arranged on the lifting sleeve (252).
7. The hole wall bulging rotary shearing device for the borehole shear test as recited in claim 1, wherein the shear blade (351) comprises a shear portion (3511), a first connecting portion (3512) and a second connecting portion (3513) which are connected in sequence; the shearing part (3511) is of a wedge-shaped structure; the second connecting part (3513) is connected with the surface of the second probe part (350), and the outer side of the second connecting part is of an arc structure; the cutting edge angle of the cutting part (3511) is 60 degrees.
8. The hole wall lateral expansion rotary shearing device for the borehole shear test is characterized in that projections of two adjacent groups of shear slices (351) on the central axis of the second probe part (350) are overlapped; the first probe head part (340) and the second probe head part (350) are both hollow cylindrical structures, the outer diameter of the first probe head part (340) is larger than that of the second probe head part (350), and the diameter of the joint of the first probe head part (340) and the second probe head part (350) is in slow transition.
9. The method of claim 3, comprising the steps of:
step 1: drilling and checking an instrument; calibrating the shearing unit to obtain the water injection amount in the expansion pipe (360)VAnd standard pressurePThe relationship betweenP=f(V)；
Step 2: placing the shear module (300) in the borehole at a predetermined test position z, opening a fluid valve (560) in the pressure and volume control device (500), whereupon hydrostatic pressure is generated in the shear unitP w Recording the water level drop in the measuring cylinder (530) until the expansion tube (360) is filled with water, the reading of the measuring cylinder beingV 1The water level drop value is the inherent volume of the expansion pipeV c ；
And step 3: opening the air valve (550) and pressurizing step by step through the pressure reducing valve (520); reading corresponding pressure value under each stage of pressure to obtain increment delta of water pressure in the expansion pipepRecording the height of the change in water level in the measuring cylinder (530) at the corresponding set pressure, i.e. the increase in volume Δ in the expansion tubeV(ii) a Recording the value of the measuring cylinder (530) at the start timeV 2And the value of the measuring cylinder (530) at the moment of terminationV 3；
And 4, step 4: starting the motion control device (600) to drive the connecting rod (330) to rotate; recording the torque of the shearing unit from the beginning of rotation to the shearing of the damaged soilM i ；
And 5: calculating the side compression mold amount of rock and soil massG M ：
In the formula:V c the inherent volume of the expansion tube is expanded for the shear unit,V m is the average volume of the shear cell expansion tube;
step 6: calculating the normal stress of the soil shear surfaceσ i ：
In the formula:pin order to achieve the corrected pressure, the pressure is,p m the reading of the pressure gauge when the shearing unit rotates,p w the pressure is the hydrostatic pressure, and the pressure is the hydrostatic pressure,p i is the elastic membrane restraining force;
the hydrostatic pressure calculation method is as follows:
when no underground water exists:
when underground water exists:
wherein,P w the pressure is the hydrostatic pressure, and the pressure is the hydrostatic pressure,h 0the height of the water surface of the burette from the hole opening,zthe depth from the ground to the side pressure test point,H w the burial depth of the underground water level to the orifice,γ w is the severity of the water;
and 7: calculation and Normal stressσ i Corresponding shear stressτ i ：
In the formula:Din order to be the diameter of the shearing face of the shearing unit,hin order to cut the height of the unit,M i in order to be the torque, the torque is,πis the circumferential ratio;
and 8: repeating the steps 2-7 for 4-6 times at different positions of the same soil layer; according to the normal stress and the shear stress of the soil shear surface obtained by the test, the internal friction angle and the cohesion of the soil can be calculated by adopting a least square method;
and step 9: and after the test is finished, closing the device, and cleaning to finish the test.
10. The test method according to claim 9, wherein the torque in step 4 isM i The calculation method is as follows:
in the formula:P an inletIn order to provide the inlet pressure of the hydraulic motor,P an outletIn order to control the outlet pressure of the hydraulic motor,V d in order to rotate the displacement of the hydraulic motor,ηthe working efficiency of the hydraulic motor is improved.
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| CN114878362A (en) * | 2022-06-01 | 2022-08-09 | 中核勘察设计研究有限公司 | Portable hole wall side expansion lifting shearing device for drilling shearing test |
| CN115165617A (en) * | 2022-09-08 | 2022-10-11 | 深圳市勘察研究院有限公司 | Self-drilling type hole bottom spinning shearing instrument |
| CN117191601A (en) * | 2023-11-08 | 2023-12-08 | 成都理工大学 | Hole wall spinning shearing device for in-situ drilling shearing test and test method |
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