Pile-soil interface shear strength testing device and method considering soil expansion and shrinkage behaviors

A technology of pile-soil interface and shear strength, which is applied in the direction of applying stable shear force to test the strength of materials, etc., can solve the problems of large shear strength error, inaccuracy, and failure to ensure the safety of pile-soil engineering, etc. To achieve the effect of small error and ensure safety

Active Publication Date: 2021-04-23
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the shear strength of the pile-soil interface measured by the prior art has a large error with the shear strength of the pile-soil interface in the actual project, which is inaccurate and cannot guarantee the safety of the pile-soil project.

Method used

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  • Pile-soil interface shear strength testing device and method considering soil expansion and shrinkage behaviors
  • Pile-soil interface shear strength testing device and method considering soil expansion and shrinkage behaviors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] figure 1 Shown, a kind of embodiment of the present invention is, a kind of pile-soil interface shear strength test device that considers soil expansion and contraction behavior, comprises lower shear box 1, the pile body material 2 in lower shear box 1, The upper shear box 3 directly above the lower shear box 1, the soil sample 4 in the upper shear box 3 and the tangential shearing device 5 are characterized in that:

[0047] The lower shear box 1 is placed on the rollers of the bottom plate 18, and the two sides of the bottom plate 18 are fixed with uprights 12, and the top of the uprights 12 passes through the connecting through hole on the side of the cross bar 11, and is above the cross bar 11. The vertical rod 12 is connected with a fixed nut 13a, and the vertical rod 12 below the cross bar 11 is connected with a support nut 13b;

[0048] The soil sample 4 in the upper shear box 3 is covered with a metal permeable stone 6, and the metal permeable stone 6 is cover...

Embodiment 2

[0062] figure 2 It is shown that the structure of the pile-soil interface shear strength test device of this example is basically the same as that of Example 1, the only difference is that the force transmission member of this example is a rigid force transmission frame 9″ composed of more than one rigid rod.

[0063] Using the pile-soil interface shear strength test device considering the expansion and contraction behavior of the soil in this example, the method for carrying out the pile-soil interface shear strength test is as follows:

[0064] A, before the test, measure and record the initial moisture content, initial dry density and initial mass of the soil sample 4 in the upper shear box 3;

[0065] B. Loosen the support nut 13b on the vertical bar 12 downwards, then apply downward normal loads to the set test load value on the cross bar 11 step by step, and then adjust the fixing nut 13a to keep the cross bar 11 to maintain the test load value; then, carry out the ope...

Embodiment 3

[0072] figure 1 It shows that the structure of the pile-soil interface shear strength test device of this example is exactly the same as that of Example 1.

[0073] Using the pile-soil interface shear strength test device considering the expansion and contraction behavior of the soil in this example, the method for carrying out the pile-soil interface shear strength test is as follows:

[0074] A, before the test, measure and record the initial moisture content, initial dry density and initial mass of the soil sample 4 in the upper shear box 3;

[0075] B. Loosen the support nut 13b on the vertical bar 12 downwards, then apply downward normal loads to the set test load value on the cross bar 11 step by step, and then adjust the fixing nut 13a to keep the cross bar 11 to maintain the test load value; then, carry out the operation of step C

[0076] C, open the water outlet device 16, water enters the soil sample 4 through the water inlet pipe 15 and the metal permeable stone ...

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Abstract

The invention discloses a pile-soil interface shear strength testing device and method considering soil expansion and shrinkage behaviors. The left side of a lower shear box is connected with tangential shear equipment, the bottom of the lower shear box is arranged on a bottom plate above an electronic balance, and a cross rod is fixed to the upper portions of vertical rods on the two sides of the bottom plate; the right side of an upper shear box is fixed on the vertical rods, and a soil sample, a metal permeable stone and a loading plate are sequentially arranged in the upper shear box from bottom to top; the loading plate is connected with the cross rod through a force transmission piece and a pressure gauge, and a displacement sensor is further arranged on the loading plate; the water inlet pipe of water outlet equipment is connected with the metal permeable stone; and the air inlet pipe and the air outlet pipe of a hot air generator are connected with the metal permeable stone. According to the testing device and method, the influence of soil expansion and shrinkage behaviors on the shear strength of the pile-soil interface is considered, the test environment better conforms to the actual environment, the measured shear strength error of the pile-soil interface is small and accurate, the safety of pile-soil engineering can be better guaranteed, and the anti-shear mechanism of the pile-soil interface is analyzed.

Description

technical field [0001] The invention relates to a pile-soil interface shear strength test device and a method thereof in geotechnical engineering. Background technique [0002] The pile-soil foundation structure is to press the prefabricated piles into the foundation soil. After the pile sinking, it works by relying on the supporting force of the soil around the pile (pile side friction resistance), thereby enhancing the strength of the foundation. As the pile-soil structure is more and more widely used in social production and practice, it is more and more important to measure the shear characteristics of the pile-soil structure and analyze its mechanism through experiments, which is of great significance to the safety of pile-soil engineering. [0003] The existing shear test method of the pile-soil interface is to place the pile body material in the lower shear box, and place prefabricated soil samples with different moisture contents in the upper shear box, and press the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24
Inventor 袁胜洋刘先峰潘高峰王一博何宗弈田茂成荆腾申郑亦轩徐子超
Owner SOUTHWEST JIAOTONG UNIV
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