KR20150100275A - Unsaturated triaxial specimen composition system using multiple unsaturated triaxial cells - Google Patents

Unsaturated triaxial specimen composition system using multiple unsaturated triaxial cells Download PDF

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KR20150100275A
KR20150100275A KR1020140021871A KR20140021871A KR20150100275A KR 20150100275 A KR20150100275 A KR 20150100275A KR 1020140021871 A KR1020140021871 A KR 1020140021871A KR 20140021871 A KR20140021871 A KR 20140021871A KR 20150100275 A KR20150100275 A KR 20150100275A
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unsaturated
pressure
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pneumatic
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김윤태
강효섭
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부경대학교 산학협력단
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    • G—PHYSICS
    • G01—MEASURING; TESTING
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    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G—PHYSICS
    • G01—MEASURING; TESTING
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    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24—Earth materials
    • 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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Abstract

The present invention relates to an unsaturated specimen composition system using a multifunctional unsaturated triaxial cell by a simple method of performing an unsaturated triaxial compression test using a multifunctional unsaturated triaxial cell. More specifically, The present invention relates to an unsaturated specimen composition system using a multifunctional unsaturated triaxial cell characterized by simultaneously forming an unsaturated stress state and a constrained pressure state with respect to a material and using an unsaturated triaxial test method using the same.

Description

[0002] Unsaturated triaxial specimen composition system using multiple unsaturated triaxial cells [

The present invention relates to an unsaturated specimen composition system using a multifunctional unsaturated triaxial cell by a simple method of performing an unsaturated triaxial compression test using a multifunctional unsaturated triaxial cell. More specifically, The present invention relates to an unsaturated specimen composition system using a multifunctional unsaturated triaxial cell by simultaneously forming an unsaturated stress state and a constrained pressure state with respect to a material.

The triaxial compression test is a test to obtain the shear strength of the soil. The stress condition and the drainage condition can be adjusted to reproduce the stress, constraint pressure and consolidation pressure of the on-site ground, so that reliable test results can be obtained.

The specimen is wrapped with a rubber film and installed in the pressure chamber to apply the confining pressure. The shear strength of the specimen is measured by shearing the specimen by differentiating the pressure between the specimen and the cell. And determines the internal friction angle and adhesion of soil.

As shown in FIG. 1, the general triaxial compression test method is a test method in which a side pressure is changed through a side pressure supply pipe, and a triaxial compression test according to a change in side pressure is performed.

Figure pat00001
) And internal friction angle
Figure pat00002
).

In the case of saturated soil, the pore water pressure in the equilibrium state corresponds to the external load, and the pore water pressure has a value of zero or more, which has an adverse effect on the effective stress. However, the unsaturated soil has a negative pore water pressure in the equilibrium state, .

Therefore, in the unsaturated triaxial compression test, an unsaturated stress state is created through the difference between the pore water pressure and the air pressure in the specimen 111, and the test is performed according to the change of the unsaturated stress state and the confining pressure in the specimen 111, Characteristic

Figure pat00003
,
Figure pat00004
,
Figure pat00005
Value.

An axis translation technique is used to induce a capillary absorption force on a specimen and to form an unsaturated stress state. 1, a positive pore water pressure is applied through the water pressure supply pipe 109 at the lower end of the specimen 111, and at the same time, an air pressure is applied to the upper end of the specimen through the pneumatic supply pipe to create an unsaturated stress state through the difference between the air pressure and the pore water pressure Perform post unsaturated triaxial compression tests. In this step, it takes a lot of time and effort until the desired state of unsaturated stress is established and the parallel state is reached in the specimen.

In this way, the unsaturated triaxial compression test is carried out through the saturation step, the consolidation step, the unsaturated stress state forming step of the specimen, and the shearing step. Also, the unsaturated shear strength is calculated from experimental results obtained at the stage of changing the constraint pressure and the unsaturated stress state about three or four times in order to obtain the constant. Therefore, it takes much time and manpower to obtain the unsaturated shear strength constant of a ground material.

Korean Patent Registration No. 10-0490886 (Triaxial Compression Tester) relates to a triaxial compression tester, which comprises a base having a sample table on which a specimen of a soil sample can be placed, and a pressure chamber A cylindrical rubber film accommodated in a sample chamber of the base so as to be placed on a specimen table of the base, and an upper and a lower perforated plate disposed above and below the specimen, . An annular fluid passage communicating with the discharge hole and guiding the discharge of air is provided on the lower surface of the casing. The discharge passage is formed to be capable of opening and closing the pressure chamber of the casing and capable of discharging water and air from the pressure chamber of the casing A water supply device for supplying water to the pressure chamber of the casing for generating water pressure and a loading device having a ram for applying a load to the specimen enclosed in the enclosing means, The present invention relates to a triaxial compression tester capable of improving the reliability of a triaxial compression test by preventing the residual of bubbles by smoothly and completely discharging air from a pressure chamber by a simple structure capable of smoothly maintaining the flow of discharged air. ,

Korean Patent Laid-Open Publication No. 10-2012-0066464 (triaxial compression test apparatus and triaxial compression test apparatus triaxial chamber) is capable of performing triaxial compression test on unsaturated soil, A technique relating to a compression test apparatus has been practiced.

However, in order to compensate for these disadvantages, a multi-step test method for testing several unsaturated stress states for one specimen has been used. However, there is a difficulty in changing the results depending on the state or property of the specimen. That is, the consolidation of the specimen occurs in the process of repeatedly applying the load, and even if the load is removed, the deformed shape is maintained.

The present invention has been developed in order to overcome the limitations of the prior art as described above, and ultimately, various unsaturated triaxial cells are used to simultaneously form unsaturated stress states and constrained pressure states for respective specimens, and an unsaturated triaxial compression test method The purpose of this study is to reduce the time and manpower consumption of unsaturated triaxial compression tests carried out through saturation, consolidation, unsaturated stress state, and shear stages.

The objective of this study is to estimate the maximum shear stress through the continuous stress - strain curves obtained from individual tests under the confining pressure and unsaturated stress conditions, not the continuous strain - strain curve obtained by the existing multistage test method.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a specimen assembly for fabricating a test piece for triaxial compression test, comprising a membrane wrapping an inner surface of a cylindrical- And a lower cap which closes a lower end of the membrane, wherein the upper cap has a concave portion for transmitting a uniform load, A pneumatic hose is provided between the lower cap and the specimen to form a ceramic disk that can create an unsaturated stress state. The pneumatic hose and the lower cap transmit pneumatic pressure through the specimen upper cap. By controlling the pneumatic pressure, the state of unsaturated stress in the specimen can be artificially adjusted.

2 shows the overall flow chart according to the difference of the unsaturated triaxial compression test method. In the case of the general unsaturated triaxial compression test (401), the specimen (111) is prepared for one disclosure, the specimen (111) is set in the unconfined triaxial cell (S), the specimen is saturated, the unsaturated stress state composition, . In order to obtain the unsaturated shear strength constant, the test is carried out six times with a total of six specimens (111) each three times depending on the change of the unsaturated stress state and the restrained pressure.

In the case of the unsaturated triaxial compression test (402) using the multistage method, tests of changes in the unsaturated stress state and the restraint pressure were repeated by repeating Loading and Reloading in the unsaturated triaxial compression test for one specimen (111) in total of two specimens 111). The test is carried out six times.

In the case of the triaxial compression test (403) using the multifunctional unsaturated triaxial cell of the present invention, as shown in FIG. 5, a plurality of unsaturated triaxial cells (S) and pneumatic pressure regulating devices (R1 to R5) The pore water pressure and the pneumatic pressure can be adjusted differently with respect to the respective specimens 111 so that the plurality of specimens 111 can be made into various unsaturated stress states at the same time to perform the triaxial compression test on each specimen 111. Compared to the multilevel test method which tests several unsaturated stress stages for one specimen 111 by performing unsaturated triaxial compression test on various specimens 111 in various unsaturated stress states to obtain the maximum shear stress, It is possible to solve the reliability problem of the test results due to damage or deformation of the specimen 111 due to the load of the load and to simultaneously set the desirably stressed state of the plurality of specimens 111 to the desired size, Lt; / RTI >

As described above, when the triaxial compression test is carried out using the multifunctional unsaturated triaxial cell according to the present invention, it is possible to simultaneously produce different unsaturated stress states of the multiple specimens and to obtain the unsaturated shear strength Triple compression test time and manpower consumption can be reduced.

Particularly, in the present invention, it is difficult to accurately calculate the maximum shear stress value by repeating Loading and Reloading for one specimen 111 by performing triaxial compression tests on the specimens. In the present invention, It is possible not only to obtain respective unsaturated strain stress-strain curves, but also to obtain an accurate estimation of the maximum shear stress value through the unsaturated triaxial compression test.

In Fig. 1, an unconfined triaxial cell perspective view in which confinement pressure, air pressure and pore water pressure are applied to a specimen
2, the overall flow chart according to the difference of the unsaturated triaxial compression test method
3 shows an example of unsaturated triaxial compression test result according to the multistage test method
4 shows an example of a triaxial compression test result using a multi-unit unsaturated triaxial cell
FIG. 5 is a schematic cross-sectional view of an unsaturated specimen composition system capable of forming various unsaturated stress state compositions and various constrained pressure states by using multi-unsaturated triaxial cells

The embodiments of the present invention may be modified into various other forms, and the scope of the present invention should not be construed as being limited by the above-described embodiments.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 shows a schematic perspective view of an unsaturated triaxial cell to which confinement pressure, air pressure and pore water pressure are applied to a specimen. FIG. 2 shows an overall flow chart according to the difference of the unsaturated triaxial compression test method. FIGS. 3 and 4 An unsaturated triaxial compression test according to the multistage test method and a triaxial compression test result using the multicyclic unsaturated triaxial cell are shown.

FIG. 5 is a schematic cross-sectional view of an unsaturated specimen composition system 300 capable of forming various unsaturated stress state compositions 201 and various constrained pressure states 202 using multi-unsaturated pre-triaxial cells.

1, the unsaturated triaxial compression test is carried out by using an unsaturated triaxial cell (S). The unsaturated triaxial cell (S) has a structure in which a side surface of a ground material specimen (111) And a lower cap 110 for supporting a lower portion of the specimen 111. The upper cap 100 and the upper cap 100 support the lower portion of the specimen 111, The lower cap 110 is composed of a water supply pipe 109 and a lower water pipe 108 for supplying pore water pressure to the specimen 111. The pneumatic pressure supply pipe 101 and the upper water pipe 102, .

A porous slab 103 is formed between the upper cap 100 and the specimen 111. A ceramic disk 106 is sandwiched between the lower cap 110 and the ground material so that gap air in the specimen does not pass therethrough. And is constituted by a side pressure supply pipe 107 for applying a restraining pressure in the unsaturated triaxial cell (S).

A positive pore water pressure is made to act on the lower end portion of the specimen 111 through the water pressure supply pipe 109 to cause the ground material specimen 111 to form an unsaturated stress composition and a pneumatic pressure is applied to the upper end portion through the pneumatic pressure supply pipe 101, The size of the difference is defined as the capillary absorption force, which allows the formation of an unsaturated stress state in the specimen.

In order to obtain unsaturated shear strength through ordinary unsaturated triaxial compression test, three different different unsaturated stress states are tested under the same confining pressure condition, and three different confining pressures different from each other under the same unsaturated stress condition are applied to the specimen The test is performed.

FIG. 2 shows an overall flow chart of the test procedure according to the difference of the unsaturated triaxial compression test method.

In the case of the general unsaturated triaxial compression test (401)

The test is performed on one specimen 111 through a process such as specimen preparation, specimen 111 setting in an unsaturated triaxial cell S, specimen saturation, unsaturated stress condition composition, triaxial compression test, and unsaturated shear strength It is a test to perform 6 tests with 6 specimens (111) each 3 times according to change of stress state and confining pressure.

In the case of the unsaturated triaxial compression test (402) using the multistage method,

The specimen was prepared for one specimen (111), the specimen setting for the unconfined triaxial cell (S), the specimen saturation, the unsaturated stress state composition and the triaxial compression test were performed and the loading and reloading were repeated in the unsaturated triaxial compression test The test is carried out six times with two specimens for the change of the unsaturated stress state and the change of the confining pressure.

However, in the case of the triaxial compression test (403) using the multifunctional unsaturated triaxial cell of the present invention,

Unlike the process of the unsaturated triaxial compression test 401 and the unsaturated triaxial compression test 402 in which the multi-stage method is applied, a multi-unsaturated triaxial cell is applied to multiple specimens 111 to be tested to saturate the specimen, And the unsaturated stress state composition process are simultaneously carried out to perform six tests with a total of six specimens through a single saturation process and an unsaturated stress state composition process. The time for the saturation process and the unsaturated stress state composition process of the specimen can be reduced.

Table 1 shows the number of days on the basis of the unsaturated triaxial compression test method. The number of days for the saturation, unsaturated stress state composition, and triaxial compression test was calculated.

Comparison of number of days by unsaturated triaxial compression test method Test Methods Number of Wednesdays Total number of days Specimen saturation Unsaturated stress state
Furtherance Triaxial compression test
(Loading) Triaxial compression test
(Reloading) General unsaturation
Triaxial Compression Test (401) 3day
(1day

Figure pat00006
3) 6day
(2day
Figure pat00007
3) 1.5day
(0.5day
Figure pat00008
3) - 10.5day Multi-step method
Unsaturated used
Triaxial compression test (402) 1day 6day
(2day
Figure pat00009
3) 1.5day
(0.5day
Figure pat00010
3) 0.3day
(0.1day
Figure pat00011
3) 8.5day Using multi-unit unsaturated triaxial cells
Triaxial Compression Test (403) 1day 2day 1.5day
(0.5day
Figure pat00012
3) - 4.5day Remarks · Saturation Saturate Saturdays - 1day
· Unsaturated stress state composition - 2day
· Triaxial Compression Test (Loading) - 0.5day
· Triaxial Compression Test (Reloading) - 0.1day

In the case of the general unsaturated triaxial compression test (401), the total number of days is 10.5 days. In the case of the unsaturated triaxial compression test (402) using the multistage method, the total number of days is 8.5 days. In the case of the triaxial compression test (403) using an unsaturated triaxial cell, it can be confirmed that the total number of days is 4.5 days.

FIGS. 3 and 4 illustrate examples of the resultant strain-strain curves obtained in the unsaturated triaxial compression test (402) using the multistage method and the triaxial compression test (403) using the multicyclic unsaturated triaxial cell,

The result obtained through the unsaturated triaxial compression test (402) using the multistage method of FIG. 3 is difficult to accurately calculate the maximum shear stress by repeating Loading and Reloading for one specimen.

The results obtained through the triaxial compression test (403) using the multifunctional unsaturated triaxial cell of FIG. 4 can be obtained by performing individual triaxial compression tests under the respective stress conditions, and the overall shear stress-strain curve can be obtained. There is an effect that can be accurately calculated.

5 is a cross-sectional view of an unsaturated specimen composition system 300 using a multifunctional unsaturated triaxial cell. The unsaturated triaxial cell S, the pressure supply device 200, the pneumatic regulating devices R1 to R5, Devices W1 to W4 and valves B1 to B7 capable of opening and closing the pneumatic and hydraulic pressures.

The pneumatic pressures generated in the pressure supply device 200 are transmitted to the respective pneumatic control devices R1 to R5 and the pneumatic pressure is controlled through the pneumatic control devices R1 to R5, 101 to the water pressure supply pipe 109 or the side pressure supply pipe 107 of the unsaturated triaxial cell S through the water pressure devices W1 to W4 connected through the pneumatic control devices R1 to R5, . The water pressure and the air pressure generated from the air pressure regulating devices R1 to R5 can be controlled by opening and closing the valves B1 to B7, if necessary.

5, the same pore water pressure is applied to the lower end of each specimen 111 through the water pressure supply pipe 109 for various unsaturated stress state compositions 201, and the pore water pressure is applied to the pressure supply device 200 The generated pneumatic pressure is adjusted to the desired pressure via the pneumatic regulator R1 and then transmitted to each cell through the hydraulic pressure device W1. The air pressure generated in the pressure supply device 200 is applied to the side pressure supply pipe 107 via the pressure application device W2 after adjusting the desired pressure through the air pressure adjustment device R2 so as to apply the same constriction pressure in the unsaturated triaxial cell S. [ The same water pressure is applied.

In order to form an unsaturated stress state of the specimen in each unsaturated triaxial cell S, air pressure is applied through the pneumatic supply pipe 101, and different air pressures are applied to the respective cells to form respective different unsaturated stress states. At this time, the air pressure generated in the pressure supply device 200 is transferred to the respective air pressure regulating devices R3 to R5, adjusted to a desired pressure state, and then acted on the pneumatic supply pipe 101 of each of the unsaturated triaxial cells S.

In order to construct the specimens with various constrained pressures in the same unsaturated stress state (202), the pore pressure and the air pressure applied to the specimen are applied to each specimen in the same manner, and only the confining pressure is changed.

The pore water pressure acting on the lower end of each specimen 111 is adjusted by the pneumatic pressure generated by the pressure supply device 200 through the pneumatic pressure regulator R1 to a desired pressure and then supplied to each cell through the hydraulic pressure device W1 .

Air pressure is applied through the pneumatic supply pipe 101 in order to form an unsaturated stress state of the specimen 111 in each unsaturated triaxial cell S to thereby form an unsaturated stress state. At this time, the air pressure Is supplied to the air pressure regulating device (R5), adjusted to a desired pressure state, and then applied to the pneumatic supply pipe (101) of each unsaturated triaxial cell (S). The air pressure generated in the pressure supply device 200 is adjusted through the pneumatic pressure regulating devices R2 to R4 so as to apply different confining pressures in the respective unsaturated triaxial cells S, W4 to the side pressure supply pipe 107. [

The pneumatic regulators (R1 to R5) and the hydrostatic pressure devices (W1 to W4) of the unsaturated specimen composition system using multifunctional unsaturated triaxial cells depend on the number of unsaturated triaxial cells (S).

As described above, by using the unsaturated specimen composition system using multifunctional unsaturated triaxial cells, various unsaturated stress states and constrained pressure states are simultaneously formed for several specimens, thereby obtaining the triaxial compression test time required to obtain the unsaturated shear strength It is possible not only to reduce the manpower consumption but also to obtain the individual strain stress-strain curve for each specimen, so that the maximum shear stress value can be accurately calculated.

S: Unsaturated triaxial cell
100: upper cap 101: pneumatic supply pipe
102: upper drain pipe 103: porous slab
104: Membrane 105: Pressure chamber
106: Ceramic disk 107: Side pressure supply pipe
108: Lower drain pipe 109: Hydraulic supply pipe
110: Lower cap 111: Specimen
200: Pressure supply
201: Various unsaturated stress phase composition system
202: Various confining pressure forming system
401: General Unsaturated Triaxial Compression Test
402; Unsaturated triaxial compression test using multi-stage method
403: Triaxial Compression Test Using Multifunctional Unsaturated Triaxial Cells
R1 to R5: Pneumatic regulator W1 to W4: Hydraulic pressure regulator B1 to B7: Valve

Claims (3)

A membrane 104 which is cylindrically wound on a side surface of a ground material specimen 111 made in a cylindrical shape, an upper cap 100 to which a load is applied from a load device having a load placed on the upper end of the specimen, The upper cap 100 includes a pneumatic supply pipe 101 and an upper drain pipe 102 for supplying pneumatic pressure and a lower cap 110 is connected to a water pressure supply pipe 109 for supplying pore water pressure to the specimen, And a porous slab 103 is provided between the upper cap 100 and the specimen 111,
A ceramic disk 106 is sandwiched between the lower cap 110 and the ground material so as to prevent gap air in the specimen from passing therethrough and an unsaturated triaxial cell composed of a side pressure supply pipe 107 for applying a confining pressure in the unsaturated triaxial cell S, (S)

Forming a specimen (201) of various unsaturated stress states for testing of different unsaturated stress states at the same confining pressure to obtain an unsaturated shear strength;

(202) by simultaneously applying different confining pressures on the specimen by applying different confining pressure to the specimen under the same unsaturated stress condition. Unsaturated Specimen Composition System
The method according to claim 1,
The various unsaturated stress state compositions 201 in the same confining pressure state,
The same pore water pressure is applied to the lower ends of the respective specimens 111 through the water pressure supply pipe 109,
The pore water pressure is adjusted by the pneumatic pressure generated by the pressure supply device 200 to the desired pressure via the pneumatic pressure regulator R1 and then transmitted to the respective cells through the hydraulic pressure device W1,
The air pressure generated in the pressure supply device 200 is applied to the side pressure supply pipe 107 via the pressure application device W2 after adjusting the desired pressure through the air pressure adjustment device R2 so as to apply the same constriction pressure in the unsaturated triaxial cell S. [ The same water pressure is applied,
In order to form an unsaturated stress state of the specimen in each unsaturated triaxial cell S, different air pressures are applied to the respective cells through the pneumatic supply pipe 101 to form respective different unsaturated stress states. At this time, 200 are delivered to the respective air pressure regulating devices R3 to R5, adjusted to a desired pressure state, and then acted on the pneumatic supply pipe 101 of each of the unsaturated exudates to form an unsaturated specimen. Unsaturated Specimen Composition System Using Multireformed Unsaturated Triaxial Cells
The method according to claim 1,
The compositions 202 of various constrained pressure states in the same unsaturated stress state,
The pore pressure and the air pressure applied to the specimen are applied to each specimen in the same way,
The pore water pressure acting on the lower end of each specimen 111 is adjusted by the pneumatic pressure generated by the pressure supply device 200 to a desired pressure via the pneumatic pressure regulator R1 and then transmitted to each cell through the hydraulic pressure device W1 And,
In order to form an unsaturated stress state of the specimen in each unsaturated triaxial cell S, an air pressure is applied through the pneumatic supply pipe 101 to form an unsaturated stress state. At this time, the air pressure generated in the pressure supply device 200 is regulated by pneumatic To the apparatus R5 to adjust the pressure to a desired pressure state, and to apply the same air pressure to the pneumatic supply pipe 101 of each of the unsaturated triaxial cells S,
The air pressure generated in the pressure supply device 200 is adjusted through the pneumatic pressure regulating devices R2 to R4 so as to apply different confining pressures in the respective unsaturated triaxial cells S, W4) to the side pressure supply pipe (107) to form an unsaturated specimen. The unsaturated specimen composition system using the multi-unsaturated triaxial cell
KR1020140021871A 2014-02-25 2014-02-25 Unsaturated triaxial specimen composition system using multiple unsaturated triaxial cells KR20150100275A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107478513A (en) * 2017-08-14 2017-12-15 西安理工大学 Test method based on the axle bursting stress path of the soil body under the conditions of negative confined pressure three
CN107505201A (en) * 2017-09-22 2017-12-22 上海申元岩土工程有限公司 A kind of test device of effective static lateral pressure coefficient of ess-strain formula
CN110320075A (en) * 2019-06-28 2019-10-11 同济大学 The device and method of low disturbance dry sand sample is prepared on triaxial test platform

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107478513A (en) * 2017-08-14 2017-12-15 西安理工大学 Test method based on the axle bursting stress path of the soil body under the conditions of negative confined pressure three
CN107478513B (en) * 2017-08-14 2020-04-10 西安理工大学 Test method based on triaxial failure stress path of soil body under negative confining pressure condition
CN107505201A (en) * 2017-09-22 2017-12-22 上海申元岩土工程有限公司 A kind of test device of effective static lateral pressure coefficient of ess-strain formula
CN107505201B (en) * 2017-09-22 2024-04-09 上海申元岩土工程有限公司 Device for testing effective static side pressure coefficient of stress strain type
CN110320075A (en) * 2019-06-28 2019-10-11 同济大学 The device and method of low disturbance dry sand sample is prepared on triaxial test platform

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