CN106226173B - Device and method for measuring shearing deformation of soil under vacuum preloading effect - Google Patents
Device and method for measuring shearing deformation of soil under vacuum preloading effect Download PDFInfo
- Publication number
- CN106226173B CN106226173B CN201610892221.3A CN201610892221A CN106226173B CN 106226173 B CN106226173 B CN 106226173B CN 201610892221 A CN201610892221 A CN 201610892221A CN 106226173 B CN106226173 B CN 106226173B
- Authority
- CN
- China
- Prior art keywords
- side plate
- annular side
- weight
- soil
- soil body
- 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
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0033—Weight
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
- G01N2203/0234—Low pressure; Vacuum
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0266—Cylindrical specimens
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0605—Mechanical indicating, recording or sensing means
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a device and a method for measuring shearing deformation of a soil body under the action of vacuum preloading, wherein the device comprises an air extractor, an upper annular side plate, a lower annular side plate, a water storage chamber, a pulley, a weight, a vertical rod and a plurality of drain pipes, wherein a soil sample chamber is formed between the upper annular side plate and the lower annular side plate; a guide pipe is communicated between the air pump and the upper annular side plate, water outlet pipe orifices at the lower ends of all the drain pipes sequentially penetrate through the upper annular side plate and the lower annular side plate and are arranged in the water storage chamber, and the drain pipes are provided with a plurality of drain holes; be connected with the rope between annular curb plate and the weight on going up, install the pulley on the rope, the weight below is equipped with the plummer, and the plummer makes the rope be in not stress state, is equipped with the scale that corresponds measurement weight height value on the montant. The device has the advantages of simple structure, convenient operation, simple processing technology and low processing cost, is easy to popularize and apply in production and teaching, and has certain theoretical significance and engineering significance for the research of the shear strength characteristics of the soil bodies with different densities.
Description
Technical Field
The invention relates to the technical field of geotechnical laboratory tests, in particular to a device and a method for measuring shearing deformation of soil under the action of vacuum preloading.
Background
When the research on the shear strength characteristics of the soil body is carried out, the measurement of the shear deformation of the soil body is the most important and direct. In the prior art, a plurality of measuring devices for shearing deformation of a soil body are used, generally, transverse shearing force is directly applied to the soil body, the shearing strength of the soil body is detected through a complex structure, the soil body is easily damaged by directly applying the transverse shearing force to the soil body, soil body collapse is caused, and a measuring result is influenced.
The vacuum preloading is to form air pressure difference inside and outside a sealing film covered on a soil body by vacuumizing the sealing film, so that the soil body generates consolidation pressure, namely, the effective stress is increased by reducing the pore water pressure under the condition that the total stress is not changed. Shear deformation is an important content of the research on the shear strength characteristics of the soil body, the vacuum preloading effect can accelerate drainage, improve the drainage quantity and increase the strength of the soil body, and the research on the shear deformation of the soil body under the action has important significance on the research on the shear strength characteristics of the soil body.
The device for measuring the shearing deformation of the soil body under the vacuum preloading effect is an instrument for measuring the shearing deformation of the soil body under the vacuum preloading condition, has certain significance for researching the shearing strength characteristic of the soil body, and the current device and method for measuring the shearing deformation can not realize the accurate measurement of the shearing deformation of the soil body under the certain vacuum preloading drainage condition.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a device and a method for measuring the shearing deformation of a soil body under the action of vacuum preloading.
The purpose of the invention is realized by the following technical scheme:
a soil body shearing deformation measuring device under the action of vacuum preloading comprises an air extractor, an upper annular side plate, a lower annular side plate, a water storage chamber, pulleys, weights, a vertical rod and a plurality of drain pipes, wherein an upper soil sample chamber with a downward opening is arranged at the lower part of the upper annular side plate, a lower soil sample chamber with an upward opening is arranged at the upper part of the lower annular side plate, and the upper soil sample chamber and the lower soil sample chamber form a cylindrical and closed soil sample chamber; a guide pipe is communicated between the air extractor and the upper annular side plate, a pipe orifice at one end of the guide pipe is communicated with the upper soil sample chamber of the upper annular side plate in a sealing way, and a pipe orifice at the other end of the guide pipe is communicated with an air inlet at the bottom of the air extractor in a sealing way; the water storage chamber is positioned below the lower annular side plate, water outlet pipe orifices at the lower ends of all the water discharge pipes sequentially penetrate through the upper annular side plate and the lower annular side plate and are arranged in the water storage chamber, and a plurality of water discharge holes communicated with the inner cavity of the soil sample chamber are distributed on the left side and the right side of each water discharge pipe; go up and be connected with the rope between annular curb plate and the weight, power fit installs the pulley on going up the rope between annular curb plate and the weight, and the weight below is equipped with the plummer, the plummer is used for bearing the weight and makes the rope be in the unstressed state, the montant is close to the vertical direction setting of weight position department, be equipped with the scale that corresponds measurement weight height value on the montant.
In order to better realize the invention, the rope is a thin iron wire or a steel wire rope; the one end tip and the last annular curb plate lateral wall center fixed connection of rope, the other end tip and the weight fixed connection of rope, the rope part between last annular curb plate and the pulley is the level unstressed state, the rope part between pulley and the weight is perpendicular unstressed state.
The preferable drainage pipe setting technical scheme of the invention is as follows: the number of the drain pipes is two, the two drain pipes sequentially penetrate through the upper annular side plate and the lower annular side plate and are arranged in the water storage chamber, the top end of each drain pipe penetrates through the top surface of the corresponding upper annular side plate and is at least 2.0cm, and the bottom end of each drain pipe penetrates through the top surface of the corresponding lower annular side plate and is at least 1.0 cm.
Preferably, the diameters of the drain pipes are all 0.7cm, the height of the top ends of the drain pipes penetrating through the top surface of the upper annular side plate is 2.4cm, and the height of the bottom ends of the drain pipes penetrating through the top surface of the lower annular side plate is 1.5 cm.
Preferably, each of the drain pipes is provided with six drain holes.
In order to facilitate the on-off control of the air suction of the guide pipe, a valve is arranged on the guide pipe.
The device for measuring the shearing deformation of the soil body further comprises a base and a bottom plate, wherein the water storage chamber is installed on the base, the vertical rod is fixedly installed on the bottom plate, and the bearing platform is horizontally arranged on the bottom plate.
Preferably, the scale has a division value of 1 mm.
Preferably, the bearing table comprises an upper flat plate and a support welded at the bottom of the upper flat plate, and the length of the upper flat plate is 7 cm; the height of the strut is 5.9cm, and the width of the strut is 1.2 cm; the upper annular side plate and the lower annular side plate are both in a cylindrical shape, the diameters of the upper annular side plate and the lower annular side plate are both 20cm, and the heights of the upper annular side plate and the lower annular side plate are both 5 cm; the water storage chamber is cylindrical, the diameter of the water storage chamber is 33.6cm, and the height of the water storage chamber is 4.2 cm; the diameter of the pulley is 4.8 cm.
A method for measuring shear deformation of a soil body under the action of vacuum preloading comprises the following steps:
A. before the test, filling soil materials in a soil sample chamber enclosed between an upper annular side plate and a lower annular side plate, and compacting the soil materials to form a cylindrical soil body with certain dry density; fixedly connecting one end part of the thin iron wire with the center of the side wall of the upper annular side plate, fixedly connecting the other end part of the thin iron wire with a weight by bypassing a pulley, bearing the weight of the weight by a bearing table, enabling the thin iron wire to be in an unstressed state, and measuring and recording the corresponding height value of the position of the weight by a graduated scale;
B. when the test is started, a valve on the guide pipe is opened, and the air extractor is started to extract air in the cylindrical soil body in the soil sample chamber until the cylindrical soil body is in a vacuum environment; when the air extractor works for air extraction, water in the cylindrical soil body is discharged into each drain pipe through the drain hole, and each drain pipe discharges the water into the water storage chamber; after the cylindrical soil body is solidified and drained for a certain time t, closing the air extractor and the valve; then the bearing table is taken off, the bottom of the weight is suspended, the thin iron wire can be in a stressed state, the thin iron wire is pulled by the weight to move downwards, the thin iron wire is pulled by a pulley to transversely shear the upper annular side plate, the height value of the weight is read and recorded at each time interval T through a graduated scale, and then the measurement of the shearing deformation of the soil body under the action of vacuum preloading can be completed;
C. and after the test is finished, taking off the weight, enabling the upper annular side plate to return to the original position, recording and counting the obtained data, and removing the residual soil in the soil sample chamber in the test for carrying out the next test.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) according to the invention, the upper annular side plate and the lower annular side plate jointly form a soil sample chamber for storing cylindrical soil, the soil sample chamber can be vacuumized by the air extractor, and the shear deformation measurement of the soil under the action of vacuum preloading can be realized; the shearing force of the cylindrical soil body is applied through the gravity provided by the weight, when the cylindrical soil body is installed, the weight is supported through the bearing table, and the rope is in an unstressed state; when the cylindrical soil body is subjected to a shear force test, the bearing table is removed, the weight pulls the rope to move under the action of gravity, and then the rope pulls the upper annular side plate and the cylindrical soil body is subjected to a shear deformation test; the graduated scale on the vertical rod can measure the height of the weight before and after the shear force test, so that the shear strength of the cylindrical soil body can be accurately reflected.
(2) The drainage pipes are arranged at different positions of the soil sample chamber, the drainage holes are arranged on the surfaces of the drainage pipes, consolidation drainage of the compacted soil in the cylindrical soil sample chamber is facilitated, real-time measurement of shear deformation under two working conditions of vacuum preloading and non-vacuum preloading of the soil with different densities can be realized through the arrangement of the air extractor, and certain theoretical significance and engineering significance are achieved for research on the shear strength characteristics of the soil with different densities.
(3) The invention can realize the rapid consolidation drainage of the soil body through the design of the drainage pipe and the drainage hole. The pulley is arranged on the rope between the upper annular side plate and the weight, and the shear test of the soil body under the action of certain tensile stress can be smoothly realized through the structural design of the thin iron wire and the pulley.
(4) The device has the advantages of simple structure, convenient operation, simple processing process flow and low processing cost, and is easy to popularize and apply in production and teaching.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, the names corresponding to the reference numbers in the drawings are:
1-air extractor, 2-valve, 3-conduit, 4-upper annular side plate, 5-lower annular side plate, 6-drain pipe, 7-cylindrical soil body, 8-drain hole, 9-thin iron wire, 10-water storage chamber, 11-base, 12-pulley, 13-weight, 14-bearing table, 15-bottom plate, 16-scale and 17-vertical rod.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
examples
As shown in fig. 1, a soil body shearing deformation measuring device under vacuum preloading effect, including air extractor 1, go up annular curb plate 4, annular curb plate 5 down, reservoir chamber 10, pulley 12, weight 13, montant 17 and a plurality of drain pipe 6, it is equipped with the last soil sample room that the opening is down to go up annular curb plate 4 lower part, it is equipped with the lower soil sample room that the opening faces upward to go up annular curb plate 5 upper portion down, it constitutes cylinder shape and inclosed soil sample room with lower soil sample room to go up soil sample room, it constitutes soil sample room with lower soil sample room symmetrical arrangement to go up soil sample room, soil sample room is used for fixed and shearing cylindrical soil body 7. A guide pipe 3 is communicated between the air extractor 1 and the upper annular side plate 4, a pipe orifice at one end of the guide pipe 3 is communicated with the soil sample feeding chamber of the upper annular side plate 4 in a sealing mode, and a pipe orifice at the other end of the guide pipe 3 is communicated with an air inlet at the bottom of the air extractor 1 in a sealing mode. The conduit 3 is provided with a valve 2, and the valve 2 controls the on-off operation of the air suction of the conduit 3. The model of the air extractor 1 is XD-40, and the air extractor 1 is used for carrying out air extraction operation on the soil sample chamber, so that the cylindrical soil body 7 is in a vacuum environment.
The water storage chamber 10 is positioned below the lower annular side plate 5, water outlet pipe openings at the lower ends of all the water discharge pipes 6 sequentially penetrate through the upper annular side plate 4 and the lower annular side plate 5 and are arranged inside the water storage chamber 10, and the water storage chamber 10 is used for storing water discharged in consolidation of the cylindrical soil body 7. The left side and the right side of the drain pipe 6 are distributed with a plurality of drain holes 8 communicated with the inner cavity of the soil sample chamber; the quantity of drain pipe 6 of this embodiment is two, and it has six wash ports 8 to open on every drain pipe 6, and two drain pipes 6 run through annular curb plate 4, lower annular curb plate 5 in proper order and place in the reservoir chamber 10 inside, and the height that exceeds the top surface of annular curb plate 4 on the drain pipe 6 top is 2.0cm at least, and the height that exceeds the top surface of lower annular curb plate 5 is 1.0cm at least in the run-through of drain pipe 6 bottom. The diameter of the drain pipe 6 is preferably 0.7cm, the height of the top end of the drain pipe 6 penetrating through and exceeding the top surface of the upper annular side plate 4 is 2.4cm, and the height of the bottom end of the drain pipe 6 penetrating through and exceeding the top surface of the lower annular side plate 5 is 1.5 cm.
Go up and be connected with the rope between annular curb plate 4 and the weight 13, power fit installs pulley 12 on the rope between annular curb plate 4 and the weight 13 on, weight 13 below is equipped with plummer 14, plummer 14 is used for bearing weight 13 and makes the rope be in unstressed state, montant 17 is close to the vertical direction setting of weight 13 position department, be equipped with the scale 16 that corresponds measurement weight 13 height value on montant 17, scale 16's division value is 1mm, scale 16's precision is higher, scale 16 is used for measuring the descending distance of weight 13, this descending distance is cylindrical soil body 7's shear deformation volume promptly. The preferable rope of the invention is a thin iron wire 9 or a steel wire rope; the thin iron wire 9 or the steel wire rope has high strength and rigidity and is not easy to deform, and the test precision is ensured. The one end tip of rope and 4 lateral wall center fixed connection on the annular curb plate of last, the other end tip and the weight 13 fixed connection of rope, the rope part between annular curb plate 4 and the pulley 12 of going up is the level and does not receive the force state, and the rope part between pulley 12 and the weight 13 is perpendicular unstressed state.
The device for measuring the shearing deformation of the soil body further comprises a base 11 and a bottom plate 15, wherein the water storage chamber 10 is installed on the base 11, the vertical rod 17 is fixedly installed on the bottom plate 15, and the bearing platform 14 is horizontally placed on the bottom plate 15. The plummer 14 includes the upper flat plate and welds the pillar in the upper flat plate bottom, and upper flat plate length is 7cm, and plummer 14 intensity is all higher and difficult deformation. The height of the pillars was 5.9cm and the width was 1.2 cm. The upper annular side plate 4 and the lower annular side plate 5 are both in a cylinder shape, the diameter of each upper annular side plate is 20cm, and the height of each upper annular side plate is 5 cm. The water storage chamber 10 is cylindrical, the diameter of the water storage chamber 10 is 33.6cm, and the height of the water storage chamber 10 is 4.2 cm. The preferred diameter of the pulley 12 in this embodiment is 4.8 cm.
The device for measuring the shearing deformation of the soil body is characterized in that the drain pipes 6 are arranged at different positions of the soil sample chamber, the drain holes 8 are arranged on the surface of the drain pipes 6, consolidation drainage of a compacted cylindrical soil body 7 in the cylindrical soil sample chamber is facilitated, the air extractor 1 is arranged, real-time measurement of the shearing deformation under two working conditions of vacuum preloading and non-vacuum preloading of soil bodies with different densities can be realized, and certain theoretical significance and engineering significance are achieved for research on the shearing strength characteristics of the soil bodies with different densities.
A method for measuring shear deformation of a soil body under the action of vacuum preloading comprises the following steps:
A. before the test, filling soil materials in a soil sample chamber enclosed between an upper annular side plate 4 and a lower annular side plate 5, and compacting the soil materials to form a cylindrical soil body 7 with certain dry density; with thin iron wire 9 one end tip and 4 lateral walls center fixed connection of last annular curb plate, walk around pulley 12 and weight 13 fixed connection with the other end tip of thin iron wire 9, plummer 14 bears the weight of weight 13 for thin iron wire 9 is in the not stress state, measures and records the corresponding height value h0 of weight 13 position through scale 16.
B. When the test is started, the valve 2 on the conduit 3 is opened, and the air extractor 1 is started to extract air in the cylindrical soil body 7 in the soil sample chamber until the cylindrical soil body 7 is in a vacuum environment; while the air extractor 1 operates to extract air, water in the cylindrical soil body 7 is discharged to each drain pipe 6 through the drain hole 8, and each drain pipe 6 discharges the water into the water storage chamber 10; after the cylindrical soil body 7 is solidified and drained for a certain time t, closing the air extractor 1 and the valve 2; then the plummer 14 is got off, 13 bottoms of weight are unsettled this moment, and thin iron wire 9 can be in the stress state, and thin iron wire 9 of the gravity pulling of weight 13 downstream, and horizontal shearing movement of annular curb plate 4 is gone up in thin iron wire 9 through the pulling of pulley 12, reads the height value and the record of weight 13 through scale 16 in every time interval T department, can accomplish the measurement of soil body shearing deformation under the vacuum preloading effect. If the time interval T is 2s (i.e., 2 seconds), the weight height value change amount from the first time interval 2s after the plummer 14 is removed is H1, and the scale 16 reads that the height value of the weight 13 is H1, then H1 is H1-H0; when the weight height value variation amount of the second time interval 2s after the plummer 14 is taken off is H2 and the graduated scale 16 reads that the height value of the weight 13 is H2, H2 is H2-H1; and by analogy, the weight height value change value H of each time interval T can be calculated, and the measurement of the shearing deformation of the soil body under the action of vacuum preloading can be realized through the weight height value change value H.
C. After the test is finished, the weight 13 is taken off, so that the upper annular side plate 4 returns to the original position, all the obtained data are recorded and counted, and the residual soil in the soil sample chamber in the test is removed for carrying out the next test.
The above-mentioned embodiments are only a preferred embodiment of the present invention, and are not intended to limit the scope of the invention, and all equivalent changes and similar substitutions made according to the contents of the claims of the present invention should fall within the scope of the present invention.
Claims (6)
1. The utility model provides a soil body shearing deformation measuring device under vacuum preloading effect which characterized in that: the device comprises an air extractor (1), an upper annular side plate (4), a lower annular side plate (5), a water storage chamber (10), a pulley (12), weights (13), vertical rods (17) and a plurality of drain pipes (6), wherein an upper soil sample chamber with a downward opening is arranged at the lower part of the upper annular side plate (4), a lower soil sample chamber with an upward opening is arranged at the upper part of the lower annular side plate (5), and the upper soil sample chamber and the lower soil sample chamber form a cylindrical and closed soil sample chamber; the closed soil sample chamber in the cylindrical shape is used for fixing and shearing a cylindrical soil body (7); the air extractor (1) is used for extracting air from a cylindrical and closed soil sample chamber, and the cylindrical soil body (7) is in a vacuum environment; a guide pipe (3) is communicated between the air extractor (1) and the upper annular side plate (4), a pipe orifice at one end of the guide pipe (3) is communicated with the soil sample loading chamber of the upper annular side plate (4) in a sealing manner, a pipe orifice at the other end of the guide pipe (3) is communicated with an air inlet at the bottom of the air extractor (1) in a sealing manner, and a valve (2) is installed on the guide pipe (3); the water storage chamber (10) is positioned below the lower annular side plate (5), water outlet pipe orifices at the lower ends of all the water drainage pipes (6) sequentially penetrate through the upper annular side plate (4) and the lower annular side plate (5) and are arranged in the water storage chamber (10), and a plurality of water drainage holes (8) communicated with a cavity in the soil sample chamber are distributed on the left side and the right side of each water drainage pipe (6); a rope is connected between the upper annular side plate (4) and the weight (13), a pulley (12) is installed on the rope between the upper annular side plate (4) and the weight (13) in a power fit mode, a bearing table (14) is arranged below the weight (13), the bearing table (14) is used for bearing the weight (13) and enabling the rope to be in a stress-free state, the vertical rod (17) is arranged in the vertical direction at a position close to the weight (13), and a graduated scale (16) corresponding to the height value of the weight (13) is arranged on the vertical rod (17); the number of the drain pipes (6) is two, the two drain pipes (6) sequentially penetrate through the upper annular side plate (4) and the lower annular side plate (5) and are arranged in the water storage chamber (10), the height of the top end of each drain pipe (6) penetrating through the top surface of the upper annular side plate (4) is at least 2.0cm, and the height of the bottom end of each drain pipe (6) penetrating through the bottom surface of the lower annular side plate (5) is at least 1.0 cm; six drain holes (8) are formed in each drain pipe (6); the rope is a thin iron wire (9) or a steel wire rope; the one end tip and the last annular curb plate (4) lateral wall center fixed connection of rope, the other end tip and weight (13) fixed connection of rope, it is the level not stress state to go up the rope part between annular curb plate (4) and pulley (12), the rope part between pulley (12) and weight (13) is perpendicular not stress state.
2. The device for measuring the shearing deformation of the soil body under the vacuum preloading according to claim 1, wherein: the diameter of the drain pipe (6) is 0.7cm, the height of the top end of the drain pipe (6) penetrating beyond the top surface of the upper annular side plate (4) is 2.4cm, and the height of the bottom end of the drain pipe (6) penetrating beyond the top surface of the lower annular side plate (5) is 1.5 cm.
3. The device for measuring the shearing deformation of the soil body under the vacuum preloading according to claim 1, wherein: still include base (11) and bottom plate (15), install on base (11) reservoir chamber (10), montant (17) fixed mounting is on bottom plate (15), plummer (14) are kept flat on bottom plate (15).
4. The device for measuring the shearing deformation of the soil body under the vacuum preloading according to claim 1, wherein: the division value of the graduated scale (16) is 1 mm.
5. The device for measuring the shearing deformation of the soil body under the vacuum preloading according to claim 1, wherein: the bearing table (14) comprises an upper flat plate and a support welded to the bottom of the upper flat plate, and the length of the upper flat plate is 7 cm; the height of the strut is 5.9cm, and the width of the strut is 1.2 cm; the upper annular side plate (4) and the lower annular side plate (5) are both in a cylindrical shape, the diameters of the upper annular side plate and the lower annular side plate are both 20cm, and the heights of the upper annular side plate and the lower annular side plate are both 5 cm; the water storage chamber (10) is cylindrical, the diameter of the water storage chamber (10) is 33.6cm, and the height of the water storage chamber (10) is 4.2 cm; the diameter of the pulley (12) is 4.8 cm.
6. A method for measuring shear deformation of a soil body under the action of vacuum preloading is characterized by comprising the following steps: the method comprises the following steps:
A. before the test, filling soil materials in a soil sample chamber enclosed between an upper annular side plate (4) and a lower annular side plate (5), and compacting the soil materials to form a cylindrical soil body (7) with a certain dry density; fixedly connecting one end part of a thin iron wire (9) with the center of the side wall of the upper annular side plate (4), enabling the other end part of the thin iron wire (9) to bypass a pulley (12) and be fixedly connected with a weight (13), bearing a weight of the weight (13) by a bearing table (14), enabling the thin iron wire (9) to be in an unstressed state, and measuring and recording a corresponding height value of the position of the weight (13) by a graduated scale (16);
B. when the test is started, a valve (2) on a guide pipe (3) is opened, and an air extractor (1) is started to extract air in a cylindrical soil body (7) in a soil sample chamber until the cylindrical soil body (7) is in a vacuum environment; while the air extractor (1) works for air extraction, water in the cylindrical soil body (7) is discharged into each drain pipe (6) through the drain hole (8), and each drain pipe (6) discharges the water into the water storage chamber (10); after the cylindrical soil body (7) is solidified and drained for a certain time t, closing the air extractor (1) and the valve (2); then the bearing table (14) is taken off, the bottom of the weight (13) is suspended at the moment, the thin iron wire (9) can be in a stressed state, the thin iron wire (9) is pulled by the gravity of the weight (13) to move downwards, the thin iron wire (9) is pulled by the pulley (12) to transversely shear the annular side plate (4), the height value of the weight (13) is read and recorded at each time interval T through the graduated scale (16), and the measurement of the shearing deformation of the soil body under the action of vacuum preloading can be completed;
C. and after the test is finished, the weight (13) is taken off, so that the upper annular side plate (4) returns to the original position, all the obtained data are recorded and counted, and the residual soil in the soil sample chamber in the test is removed for the next test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610892221.3A CN106226173B (en) | 2016-10-12 | 2016-10-12 | Device and method for measuring shearing deformation of soil under vacuum preloading effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610892221.3A CN106226173B (en) | 2016-10-12 | 2016-10-12 | Device and method for measuring shearing deformation of soil under vacuum preloading effect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106226173A CN106226173A (en) | 2016-12-14 |
| CN106226173B true CN106226173B (en) | 2020-09-15 |
Family
ID=58076869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610892221.3A Active CN106226173B (en) | 2016-10-12 | 2016-10-12 | Device and method for measuring shearing deformation of soil under vacuum preloading effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106226173B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303329A (en) * | 2018-02-02 | 2018-07-20 | 山西省交通科学研究院 | A kind of humidification soil sample torsional strength test device and test method |
| CN117191599B (en) * | 2023-09-08 | 2024-03-29 | 山东时代应力工程技术有限公司 | Bridge pavement anti-damage force test equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101105432A (en) * | 2007-06-13 | 2008-01-16 | 长安大学 | Cutting creep instrument |
| CN101148873A (en) * | 2007-10-25 | 2008-03-26 | 郁玫 | Method for reinforcing composite vacuum prepressing soft soil foundation |
| CN101413261A (en) * | 2008-11-28 | 2009-04-22 | 天津市水利科学研究所 | Double-layer low-position vacuum preload consolidation device and soft soil foundation reinforcing method |
| CN101560762A (en) * | 2009-05-13 | 2009-10-21 | 天津城市建设学院 | Vacuum prepressing improved technical method |
| CN102393354A (en) * | 2011-10-20 | 2012-03-28 | 上海交通大学 | Intelligent soil engineering shear rheometer |
| CN103134729A (en) * | 2013-02-18 | 2013-06-05 | 长安大学 | Stress-strain control type direct shear apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105714761B (en) * | 2016-03-11 | 2019-01-25 | 绍兴文理学院 | A kind of vertical layered weak soil quick consolidation method and device of drawing water |
-
2016
- 2016-10-12 CN CN201610892221.3A patent/CN106226173B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101105432A (en) * | 2007-06-13 | 2008-01-16 | 长安大学 | Cutting creep instrument |
| CN101148873A (en) * | 2007-10-25 | 2008-03-26 | 郁玫 | Method for reinforcing composite vacuum prepressing soft soil foundation |
| CN101413261A (en) * | 2008-11-28 | 2009-04-22 | 天津市水利科学研究所 | Double-layer low-position vacuum preload consolidation device and soft soil foundation reinforcing method |
| CN101560762A (en) * | 2009-05-13 | 2009-10-21 | 天津城市建设学院 | Vacuum prepressing improved technical method |
| CN102393354A (en) * | 2011-10-20 | 2012-03-28 | 上海交通大学 | Intelligent soil engineering shear rheometer |
| CN103134729A (en) * | 2013-02-18 | 2013-06-05 | 长安大学 | Stress-strain control type direct shear apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106226173A (en) | 2016-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201378166Y (en) | Test device for studying permeable destruction phenomenon | |
| CN105203410B (en) | A kind of experimental rig for being used to measure rock shearing creep properties | |
| CN109459367B (en) | Infiltration method for realizing multi-field coupling and in-situ dry-wet circulation | |
| CN102749276B (en) | Device and method for determining permeation coefficient of unsaturated soil | |
| US10823720B2 (en) | Deep soil water percolation monitor and monitoring method therefor | |
| CN108344676B (en) | The testing permeability experimental system of hyposmosis clay | |
| CN102706728A (en) | Multifunctional unsaturated soil triaxial test device capable of circularly applying suction and method thereof | |
| CN109459368B (en) | Osmotic instrument for realizing multi-field coupling and in-situ dry-wet circulation | |
| CN103472206B (en) | Dual-layer pressure plate instrument for measuring soil-water characteristic curve | |
| CN103076230A (en) | Test method and test device of mechanical properties of soil-structure contact surface | |
| CN106226173B (en) | Device and method for measuring shearing deformation of soil under vacuum preloading effect | |
| CN104914029B (en) | Large scale city solid waste skeleton and pore water Volume Changes coefficient measuring device | |
| CN110160929A (en) | Realize the flexible wall permeameter and application method that two kinds of solution continuously permeate | |
| CN202216789U (en) | Test stand of adsorption force of bottom of pile shoe of self-elevating platform | |
| CN111622277A (en) | Test device and test method for simulating influence of pile end cavities on bearing performance of pile foundation | |
| CN101514978B (en) | Test method for studying phenomenon of permeable damage on soil body and test device thereof | |
| CN111707556A (en) | Indoor simulation test method for seepage and settlement deformation of filled foundation | |
| CN106908357B (en) | Textile drip diffusion and water evaporation test integrated test equipment | |
| CN106769517A (en) | The experimental technique of Fracture Toughness of Rocks is tested under the conditions of a kind of pore pressure | |
| CN105259088A (en) | Method and device for quickly determining permeability functions of unsaturated soil | |
| CN208459168U (en) | It is a kind of simulation soil body load-bearing under the conditions of drying and watering cycle stability experimental rig | |
| CN102967695A (en) | Soil body water saturation-drainage circulation compression test method and device | |
| CN110082499A (en) | A kind of soil body character test device and its test method | |
| CN112763401A (en) | Rockfill material humidifying deformation test device and method for simulating rainfall infiltration through servo control | |
| CN112033863A (en) | Device and method for measuring uranium migration in small column simulation soil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |