CN110017764B - Method for measuring lateral deformation under different confining pressure conditions - Google Patents
Method for measuring lateral deformation under different confining pressure conditions Download PDFInfo
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- CN110017764B CN110017764B CN201910342359.XA CN201910342359A CN110017764B CN 110017764 B CN110017764 B CN 110017764B CN 201910342359 A CN201910342359 A CN 201910342359A CN 110017764 B CN110017764 B CN 110017764B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
Abstract
The invention relates to a lateral deformation measuring method under different confining pressure conditions, belonging to the technical field of geotechnical models, wherein IPC classification numbers are E02B 1/02 and E02D 33/00. According to the measuring method, the left and right extension rods and other auxiliary devices are utilized, so that the measuring direction of the lateral deformation measuring system is orthogonal to the vertical loading direction, the influence between the vertical direction and the horizontal direction can be effectively eliminated, the measuring precision is improved, the measuring points of the sample are always the same in the compression deformation process no matter the sample is in the consolidation process or the vertical loading process, and the defects of the traditional measurement are overcome. The invention can directly measure the lateral deformation of the cylindrical sample and the rectangular sample, and overcomes the defect of indirectly obtaining the lateral deformation by the conventional method.
Description
Technical Field
The invention relates to a lateral deformation measuring method under different confining pressure conditions, belonging to the technical field of geotechnical models, wherein IPC classification numbers are E02B 1/02 and E02D 33/00.
Background
An indoor large triaxial test for testing the consolidation deformation characteristics of a soil body generally adopts a cylindrical sample, the diameter phi of the sample is 30cm, the height H of the sample is 60cm or 75cm, and confining pressure is applied to the periphery of the sample during the consolidation test. According to geotechnical test regulation (SL237-1999), the height, area and volume of the sample after solidification are respectively calculated by the formulas (1) to (3), the lateral deformation amount of the sample at different height positions in the solidification process is mainly assumed to be the same, and the assumption has certain difference with the actual situation, and the main reasons are as follows.
(1) Because the upper cap and the base on the indoor large triaxial device restrict the end parts at the two ends of the sample, the sample is in a dumbbell shape with two large ends and a small middle part when the sample is solidified, and the sample is not in a cylinder shape with the same size of reduction.
(2) The lateral deformation of the sample at different heights in the consolidation test process is different due to the unevenness of the soil body and the anisotropy caused by layered sample preparation.
Therefore, the actual area of the sample after consolidation has a certain deviation from the calculation result of the formula (2).
Height of sample
hc＝h0-Δhc (1)
Area of sample
Sample volume
Vc＝hcAc (3)
In the formula:
h0-the starting height of the sample, cm;
V0-sample starting volume, cm 3;
Δhcconsolidation sinkage, measured by an axial displacement meter, cm;
Δ V-consolidation displacement, cm 3.
In the large triaxial test process, the axial deformation of the sample is determined by measuring the relative position of the axial piston, and the area of the sample in the triaxial test process is obtained according to the formula (2), but the formula is established on the premise that the lateral deformation of the sample at different heights is the same, and the lateral deformation and the actual area of the sample in the test process have certain in and out, and the main reasons are as follows.
(1) No matter the sample is a cylindrical sample or a cuboid sample, in the process of a large triaxial test, the middle part of the sample appears a drum-shaped phenomenon under the action of axial compression.
(2) Due to the influence of end portion constraint, the size change of the interfaces at the two ends of the sample can be ignored in the shearing process, and the area of the cross section is calculated by adopting a formula (2) and the actual in-and-out is realized.
For a cylindrical sample, the annular deformation device is used for measuring the annular deformation of the cylindrical sample so as to obtain the area of the sample, mainly the annular deformation instrument is a flexible measuring device, the annular deformation instrument is tightly attached to the surface of a rubber film of the cylindrical sample through tensile force and deforms along with the sample in the large-scale triaxial test process, so that the annular deformation of the sample is measured, and the lateral average deformation of the sample is obtained. If the annular deformation device is used for measuring the lateral deformation of the cuboid sample, the annular deformation device cannot be tightly attached to the surface of the rubber film of the cuboid sample, so that the lateral deformation of the sample cannot be accurately measured.
Disclosure of Invention
The invention aims to overcome the defect that the lateral deformation of the existing indoor large-scale three-axis sample (cylindrical) can not be indirectly obtained or the lateral deformation of the cuboid three-axis sample can not be obtained under different confining pressure conditions, provides a method for measuring the lateral deformation of the cuboid sample, can also measure the lateral deformation of the conventional three-axis sample, overcomes the defects of the traditional measuring method, and provides a new and more reasonable deformation measuring means for a triaxial test of the soil engineering. The technical solution of the invention is as follows:
a method for measuring lateral deformation under different confining pressure conditions comprises the following steps:
first, preparation of test
(1) Checking all pipelines inside and outside a pressure chamber of the large triaxial test device, ensuring that the pipelines are smooth, freely closing a valve, and ensuring that a closed water and gas system has no water leakage or gas leakage under the condition of applying maximum confining pressure;
(2) the rubber film used in the test is ensured to be intact and not damaged;
(3) and a confining pressure gauge, an axial pressure sensor and an axial displacement sensor used in an inspection test are ensured to be in a normal working state.
Secondly, placing the sample
(1) Preparing a cuboid sample, wherein the appearance of four side surfaces of the sample is free of defects, the top surface and the bottom surface are flat, and the actual length, width and height of the sample are measured;
(2) mounting the rubber film on a sample by using a molding cylinder, and flattening the rubber film by using a brush;
(3) placing the sample sleeved with the rubber film on a rectangular platform of the base, and aligning the rectangular platform surface of the upper cap with the top surface of the sample; binding the rubber film to ensure that the upper end and the lower end of the rubber film are respectively tightly attached to the upper cap and the base so as to prevent air from permeating into the rubber film when confining pressure is applied; and vacuumizing the sample to enable the rubber film to be tightly attached to the surface of the sample, and checking whether air leaks from the binding position.
Thirdly, installing a lateral deformation measuring system
Lateral deformation measurement system comprises measuring device and auxiliary device, measuring device includes resistance strain type extensometer, right extension rod, left extension rod, gag lever post and guide bar, auxiliary device includes reference column, locating piece, oval rubber block, fixed plate, support column, hangs cantilever bar and lifting rope.
The right stretching rod and the left stretching rod are made of aluminum alloy materials, and the section of each stretching rod is L-shaped; the limiting rod, the guide rod and the positioning column are made of stainless steel; the fixing plate is made of alloy steel chromium plating;
the positioning block is a cylinder with the diameter of 25mm and the height of 5mm, a positioning hole with the depth of 3mm and the diameter of 2.5mm is arranged at the center of the upper surface of the cylinder, two screw holes with the depth of 5mm are arranged on the side surface of the cylinder, an included angle of 90 degrees is formed between the two screw holes, and a screw is fixed on each screw hole;
round holes with the diameter of 2.5mm and the depth of 30mm are arranged at different height positions of the support column; the diameter of the cantilever rod is 2mm, the length of the cantilever rod is 18cm, one end of the cantilever rod is inserted into the round hole of the support column to be fixed on the support column, and a groove is carved at the other end of the cantilever rod; the upper end of the lifting rope is tied in the groove, and the lower end of the lifting rope is tied in the middle of the limiting rod and used for suspending the measuring device.
The specific installation steps are as follows:
(1) determining two sticking positions on two opposite side surfaces of the sample respectively, sticking two oval rubber blocks to rubber films at the two sticking positions respectively by using a sticking agent, sticking two positioning blocks to the two oval rubber blocks respectively by using the sticking agent, and enabling positioning holes on the two positioning blocks to be in opposite positions; screws are respectively arranged in the two screw holes of the positioning block;
(2) the resistance strain type extensometer is connected with the rear end parts of the left extension rod and the right extension rod through guide rods, the front end parts of the left extension rod and the right extension rod are respectively fixedly connected with a fixed plate, and the limiting rods are arranged at the positions, close to the rear end parts, of the left extension rod and the right extension rod; the two fixing plates are respectively fixedly connected with a positioning column, the two positioning columns are respectively placed in positioning holes on two opposite side surfaces, and the two screws and the fixing plates are wound together and tightened by rubber bands, so that the fixing plates and the positioning blocks do not generate relative displacement;
(3) fixing the lower end of the supporting column on the base, and adjusting the length of the lifting rope to enable the left extension rod and the right extension rod to be in a horizontal state;
(4) repeating the above operation, respectively installing a measuring device at the upper, middle and lower positions of two opposite side surfaces, respectively installing a measuring device at the upper, middle and lower positions of the other two opposite side surfaces, and ensuring that the six measuring devices do not influence each other;
(5) and connecting a data line on the measuring device to a data acquisition system, checking whether the measuring device is in a normal state, and resetting the initial displacement value to zero.
Fourthly, applying confining pressure
And (4) installing a pressure cover, applying confining pressure, performing a large triaxial test, and measuring the lateral deformation of the sample.
Further, the sample is a cuboid sample with the length of 30cm, the width of 20cm and the height of 60 cm.
Furthermore, the resistance value of a strain gauge of the resistance strain type extensometer is 350 omega, the bridge voltage is less than or equal to 6V, the output sensitivity is 2mV/V, and the output end connector is four-core or five-core and can bear the gas pressure of 2 MPa.
The measuring method of the invention has the following advantages:
(1) the lateral deformation measuring system not only can directly measure the lateral deformation of the cylindrical sample, but also can directly measure the lateral deformation of the cuboid sample, and overcomes the defect that the lateral deformation is indirectly obtained by adopting a conventional method.
(2) The measuring method realizes that all measuring points are the same point all the time in the sample compression deformation process no matter the sample is in the consolidation process or the vertical loading process, and overcomes the defects of the traditional measurement.
(3) The device capable of laterally deforming can bear the confining pressure of 2MPa of the highest pressure, and can meet the requirements of conventional triaxial tests on the confining pressure and also can meet part of geotechnical tests with special requirements, such as large triaxial penetration shear tests.
(4) The measuring direction of the lateral deformation measuring system is orthogonal to the vertical loading direction, so that the influence between the vertical direction and the horizontal direction can be effectively eliminated, and the measuring precision is improved.
(5) Compared with the size (length 30cm, width 20cm and height 60cm) of a sample, the lateral deformation measurement system adopted by the invention has the advantages that the measurement precision can reach 0.05mm, the measuring range can reach 20% of the size of the sample, and the measurement data is stable.
(6) A single measuring device can be used independently, and each measuring device is independent from each other, does not influence each other, and repeatedly usable has reduced scientific research project's cost.
Drawings
FIG. 1 is a layout view of a lateral deformation measurement system of the present invention;
FIG. 2 is a top view of section A-A of FIG. 1 (excluding the base and lower portions);
FIG. 3 is an enlarged view of portion B of FIG. 2;
FIG. 4 is a side view of the extension rod of FIG. 2;
fig. 5 is an enlarged view of the portion C of fig. 4.
Wherein, 1 is the data line, 2 is resistance strain gauge, 3 is the right pole that stretches, 4 is the left pole that stretches, 5 is the gag lever post, 6 is the guide bar, 7 is the bolt, 8 is the reference column, 9 is the locating piece, 10 is the screw, 11 is oval rubber block A, 12 is the fixed plate, 13 is the rubber membrane, 14 is the support column, 15 is the pole of encorbelmenting, 16 is the lifting rope, 17 is the base, 18 is the upper cap, 19 is spherical pressure head and piston rod, 20 is the sample.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings.
The invention discloses a method for measuring lateral deformation under different confining pressure conditions, which comprises the following steps of:
first, preparation of test
(1) Checking all pipelines inside and outside a pressure chamber of a large triaxial test device, wherein the pipelines must be ensured to be smooth, a valve is closed freely, and a closed water and gas system has no water leakage and gas leakage under the condition of applying the maximum confining pressure (2.0 Mpa);
(2) the rubber membrane 13 used in the test should be ensured to be intact and not damaged;
(3) and a confining pressure gauge, an axial pressure sensor and an axial displacement sensor used in an inspection test are ensured to be in a normal working state.
Secondly, placing the sample
(1) Checking whether the appearance of four side surfaces of the test sample 20 is flawless and whether the top surface and the bottom surface are flat or not, and measuring the actual length, width and height of the cuboid test sample 20; the sample 20 adopted in the embodiment is a cuboid sample with the length of 30cm, the width of 20cm and the height of 60 cm;
(2) mounting the rubber film 13 on the sample 20 by using a molding cylinder, and flattening the rubber film 13 by using a brush to enable the rubber film to be tightly attached to the side surface of the sample 20;
(3) placing the sample 20 sleeved with the rubber film 13 on a rectangular platform of the base 17, aligning the rectangular platform surface of the upper cap 18 with the top surface of the sample 20, and adjusting the position of the sample 20 to ensure that the spherical pressure head is coincided with the centroid of the piston rod 19, the centroid of the upper cap 18, the centroid of the sample 20 and the centroid of the base 17; binding the rubber film 13 to ensure that the upper end and the lower end of the rubber film are respectively tightly attached to the upper cap 18 and the base 17 so as to prevent air from permeating into the rubber film 13 when confining pressure is applied; finally, the sample 20 is vacuumized, the rubber film 13 is tightly attached to the surface of the long sample 20, and whether air leaks from the binding position is checked.
Thirdly, installing a lateral deformation measuring system
The lateral deformation measuring system adopted by the invention comprises a measuring device and an auxiliary device, wherein the measuring device comprises a resistance strain type extensometer 2, a right extension rod 3, a left extension rod 4, a limiting rod 5 and a guide rod 6, and the auxiliary device comprises a positioning column 8, a positioning block 9, an oval rubber block 11, a fixing plate 12, a supporting column 14, a cantilever rod 15 and a lifting rope 16.
The resistance strain gauge extensometer 2: the resistance value of the strain gauge is 350 omega, the bridge voltage is less than or equal to 6V (both direct current and alternating current), the output sensitivity is 2mV/V, and the output end connector has four cores or five cores and can bear the gas pressure of 2 MPa.
The right extension rod 3 and the left extension rod 4 are made of aluminum alloy materials, the section of each of the right extension rod and the left extension rod is L-shaped, the aluminum alloy materials are selected for the main purpose of ensuring that the quality of the measuring device is light enough, and the L-shaped section of each of the right extension rod and the left extension rod is deformed to the greatest extent during the measurement process, so that measurement errors are avoided.
The limiting rod 5 is made of stainless steel, has the diameter of 4mm and is used for preventing the lateral deformation of the measuring device from being too large and exceeding the measuring range of the resistance strain type extensometer 2.
The guide rod 6 is made of stainless steel, has the diameter of 3mm, and is used for ensuring the deformation of the whole measuring device in one plane and ensuring the measuring precision.
The positioning column 8 is made of stainless steel, has a diameter of 5mm, and is used for fixing the left and right extension rods 3 and 4 to the positioning hole in the positioning block 9.
The fixing plate 12 is made of alloy steel chromium plating and is used for connecting the left and right extension rods 3 and 4 and the positioning column 8.
The positioning block 9 is a cylinder with the diameter of 25mm and the height of 5mm, the upper surface and the lower surface of the cylinder are smooth, a positioning hole with the depth of 3mm and the diameter of 2.5mm is formed in the center of one surface of the cylinder, two screw holes with the depth of 5mm are formed in the side face of the cylinder, a 90-degree included angle is formed between the two screw holes, and the screw 10 is fixed on each screw hole. The positioning block 9 is made of nylon, so that the drilling tool is firm, light in weight, convenient to drill and elastic to a certain degree.
The oval rubber block 11 is 3mm thick, slightly larger than the positioning block 9 in area, and is stuck between the rubber film 13 outside the sample 20 and the positioning block 9 to play a transition role so as to prevent the positioning block 9 from falling off from the rubber film 13 too early.
The support column 14 is preferably made of wood, and can also be made of other materials meeting the requirements, the diameter of the support column is 30mm, the length of the support column is 100cm, round holes with the diameter of 2.5mm and the depth of 30mm are arranged at different height positions on the support column, and the round holes are used for fixing the cantilever rods 15. The lower end of the supporting column 14 is fixed on the base, and the cantilever rods 15 are inserted into the round holes at different heights on the upper part.
The diameter of the cantilever rod 15 is 2mm, the length is 18cm, one end of the cantilever rod is inserted into the round hole of the support column 14, so that the cantilever rod is fixed on the support column 14, and a groove is carved at the other end of the cantilever rod. The upper end of the lifting rope 16 is tied in the groove, the lower end of the lifting rope is tied in the middle of the limiting rod 5 and used for suspending the measuring device, and the left extension rod 4 and the right extension rod 3 are kept horizontal.
The specific installation steps are as follows:
(1) determining two sticking positions on two opposite side surfaces of a sample 20 respectively, sticking two oval rubber blocks 11 to rubber films 13 at the two sticking positions respectively by using an adhesive, sticking two positioning blocks 9 to the two oval rubber blocks 11 respectively by using the adhesive, and enabling positioning holes on the two positioning blocks 9 to be in opposite positions (namely the connecting line of the two positioning holes is vertical to the two side surfaces of the sample 20); and screws 10 are respectively arranged in the two screw holes of the positioning block 9.
(2) The resistance strain type extensometer 2 is connected with the rear end parts of a left extension rod 4 and a right extension rod 3 through a guide rod 6, the front end parts of the left extension rod 4 and the right extension rod 3 are respectively fixedly connected with a fixed plate 12, and a limiting rod 5 is arranged at the position, close to the rear end part, of the left extension rod 4 and the right extension rod 3; the fixing plate 12 is fixedly connected with a positioning column 8, the two positioning columns 8 are respectively placed in positioning holes on two opposite side surfaces, and the two screws 10 and the fixing plate 12 are wound together and tightened by rubber bands, so that the fixing plate 12 and the positioning block 9 do not generate relative displacement, and the measured value is lateral deformation of the sample.
Adopt the rubber band to link together reference column 8, fixed plate 12 and locating piece 9, can provide sufficient fixed dynamics, prevent to take place relative displacement between the three, lead to measuring inaccurate, also avoided the measuring device deformation that other connection dynamics lead to too big.
(3) The lower end of a supporting column 14 is fixed on a base, a cantilever rod 15 is inserted into round holes at different heights on the upper portion of the supporting column, the upper end of a lifting rope 16 is tied in a groove on the cantilever rod 15, the lower end of the lifting rope is tied in the middle of a limiting rod 5 and used for suspending the measuring device, and the length of the lifting rope 16 is adjusted to enable the left extension rod 4 and the right extension rod 3 to be in a horizontal state.
(4) Repeating the above operation, respectively installing a measuring device at the upper, middle and lower positions of two opposite side surfaces, respectively installing a measuring device at the upper, middle and lower positions of the other two opposite side surfaces, and ensuring that the six measuring devices do not influence each other.
(5) The data line 1 on the measuring device is connected to a data acquisition system, the measuring device is checked whether it is in a normal state, and the initial displacement value is zeroed.
Fourthly, applying confining pressure
And (3) installing a pressure cover, applying confining pressure, performing a large triaxial test, and measuring the lateral deformation of the test sample 20.
Claims (3)
1. A method for measuring lateral deformation under different confining pressure conditions is characterized by comprising the following steps:
first, preparation of test
(1) Checking all pipelines inside and outside a pressure chamber of the large-scale triaxial device, ensuring that the pipelines are smooth, freely closing a valve, and ensuring that a closed water and gas system has no water leakage or gas leakage under the condition of applying maximum confining pressure;
(2) the rubber film (13) used in the test is ensured to be intact and not damaged;
(3) a confining pressure gauge, an axial pressure sensor and an axial displacement sensor used in a checking test are ensured to be in a normal working state;
secondly, placing the sample
(1) Preparing a cuboid sample (20), wherein the appearance of four side surfaces of the sample (20) is free of defects, the top surface and the bottom surface are flat, and the actual length, width and height of the sample (20) are measured;
(2) mounting the rubber film (13) on the sample (20) by using a molding cylinder, and flattening the rubber film (13) by using a hairbrush;
(3) placing the test sample (20) sleeved with the rubber film (13) on a rectangular platform of the base (17), and aligning the rectangular platform surface of the upper cap (18) with the top surface of the test sample (20); binding the rubber film (13) to ensure that the upper end and the lower end of the rubber film (13) are respectively tightly attached to the upper cap (18) and the base (17) so as to prevent air from permeating into the rubber film (13) when confining pressure is applied; vacuumizing the sample (20), enabling the rubber film (13) to cling to the surface of the sample (20), and checking whether air leaks from the binding position;
thirdly, installing a lateral deformation measuring system
The lateral deformation measuring system consists of a measuring device and an auxiliary device, wherein the measuring device comprises a resistance strain type extensometer (2), a right extension rod (3), a left extension rod (4), a limiting rod (5) and a guide rod (6), and the auxiliary device comprises a positioning column (8), a positioning block (9), an oval rubber block (11), a fixing plate (12), a supporting column (14), a cantilever rod (15) and a lifting rope (16);
the right stretching rod (3) and the left stretching rod (4) are made of aluminum alloy materials, and the section of each stretching rod is L-shaped; the limiting rod (5), the guide rod (6) and the positioning column (8) are made of stainless steel; the fixing plate (12) is made of alloy steel chromium plating;
the positioning block (9) is a cylinder with the diameter of 25mm and the height of 5mm, a positioning hole with the depth of 3mm and the diameter of 2.5mm is arranged at the center of the upper surface of the cylinder, two screw holes with the depth of 5mm are arranged on the side surface of the cylinder, an included angle of 90 degrees is formed between the two screw holes, and a screw (10) is fixed on each screw hole;
round holes with the diameter of 2.5mm and the depth of 30mm are arranged at different height positions of the supporting column (14); the diameter of the cantilever rod (15) is 2mm, the length of the cantilever rod is 18cm, one end of the cantilever rod is inserted into the round hole of the support column (14) to be fixed on the support column (14), and a groove is carved at the other end of the cantilever rod; the upper end of the lifting rope (16) is tied in the groove, and the lower end of the lifting rope is tied in the middle of the limiting rod (5) and used for suspending the measuring device;
the specific installation steps are as follows:
(1) determining two sticking positions on two opposite side surfaces of a sample (20), respectively sticking two oval rubber blocks (11) to rubber films (13) at the two sticking positions by using an adhesive, respectively sticking two positioning blocks (9) to the two oval rubber blocks (11) by using the adhesive, and enabling positioning holes on the two positioning blocks (9) to be in opposite positions; screws (10) are respectively installed in the two screw holes of the positioning block (9);
(2) the resistance strain type extensometer (2) is connected with the rear end parts of the left extension rod (4) and the right extension rod (3) through a guide rod (6), the front end parts of the left extension rod (4) and the right extension rod (3) are respectively fixedly connected with a fixed plate (12), and the limiting rods (5) are arranged at the positions, close to the rear end parts, of the left extension rod (4) and the right extension rod (3); the two fixing plates (12) are respectively fixedly connected with a positioning column (8), the two positioning columns (8) are respectively placed in positioning holes on two opposite side surfaces, and two screws (10) and the fixing plates (12) are wound together and tightened by rubber bands, so that the fixing plates (12) and the positioning blocks (9) do not generate relative displacement;
(3) fixing the lower end of a support column (14) on a base, and adjusting the length of a lifting rope (16) to enable the left extension rod (4) and the right extension rod (3) to be in a horizontal state;
(4) repeating the above operation, respectively installing a measuring device at the upper, middle and lower positions of two opposite side surfaces, respectively installing a measuring device at the upper, middle and lower positions of the other two opposite side surfaces, and ensuring that the six measuring devices do not influence each other;
(5) connecting a data line (1) on the measuring device to a data acquisition system, checking whether the measuring device is in a normal state, and enabling an initial displacement value to return to zero;
fourthly, applying confining pressure
And (3) installing a pressure cover, applying confining pressure, performing a large triaxial test, and measuring the lateral deformation of the test sample (20).
2. The method of claim 1, wherein the test specimen (20) has a length of 30cm, a width of 20cm and a height of 60 cm.
3. The method for measuring the lateral deformation under different confining pressure conditions as recited in claim 1, wherein the resistance value of the strain gauge of the resistance strain type extensometer (2) is 350 Ω, the bridge voltage is less than or equal to 6V, the output sensitivity is 2mV/V, and the output terminal is four-core or five-core and can bear the gas pressure of 2 MPa.
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