Small hole expansion test device and test method thereof

A test device, expander technology, applied in the direction of measuring device, using stable tension/pressure test material strength, soil test, etc., can solve the expensive centrifuge test, cylindrical hole and spherical hole expansion and contraction test research Few, no model test design and other issues

Active Publication Date: 2019-09-06
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the simulation methods for the expansion of small holes include: centrifugal model test method, which can be combined with the test of hole expansion, but the centrifuge test is relatively expensive; in addition, some researchers use other materials such as rocks, rubber, etc. to simulate small hole expansion mechanical behavior
In general, there are few experimental studies on the expansion and contraction of cylindrical and spherical pores in saturated soft clay, and there is no similar model test design

Method used

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  • Small hole expansion test device and test method thereof
  • Small hole expansion test device and test method thereof
  • Small hole expansion test device and test method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The present invention carries out the process of cylindrical small hole expansion simulation test, comprises the steps:

[0065] 1) Fill the lower layer of soil (saturated soft clay) into the model box 1 as required, insert the second end cap 24 of the cylindrical expander 2 into one of the positioning holes, and snap the first end cap 23 into the model The other positioning hole of the box 1 is used to keep the cylindrical dilator 2 placed horizontally and securely and sealed;

[0066] 2) Open the water inlet control valve 61, and open the water outlet control valve 71 at the same time, fill the elastic membrane 21 of the dilator 2 with water until the elastic membrane 21 keeps the surface even (the outer diameter of the elastic membrane in this state is its initial outer diameter). diameter), and after the gas in the closed space 20 is exhausted from the water outlet pipe 7, close the water inlet control valve 61, stop water injection and check whether the closed spac...

Embodiment 2

[0071] The present invention carries out the process of cylindrical aperture shrinkage simulation test, comprises the following steps:

[0072] (1) After filling the lower layer of soil (saturated soft clay) into the model box 1 as required, insert the second end cover 24 of the cylindrical expander 2 into a positioning hole, and snap the first end cover 23 into the model box 1 to keep the cylindrical dilator 2 placed horizontally and securely and sealed;

[0073] (2) Open the water inlet control valve 61, and open the water outlet control valve 71 at the same time, fill the elastic membrane 21 of the dilator 2 with water until the elastic membrane 21 keeps the surface even, and exhaust the gas in the closed space 20 from the water outlet pipe 7 Finally, close the water inlet control valve 61, stop water injection and check whether the closed space 20 leaks, if there is no water leakage, then close the water outlet control valve 71, and open the water inlet control valve 61 to...

Embodiment 3

[0078] The present invention carries out the process of spherical small hole expansion simulation test, comprises the steps:

[0079] A. After filling the lower layer of soil (saturated soft clay) into the model box 1 as required, reserve a small groove for the spherical expander, place the spherical expander in the small groove, and keep the spherical expander placed horizontally and The water injection pipe 6 faces upwards;

[0080] B. Open the water inlet control valve 61 of the spherical expander, and open the water outlet control valve 71 at the same time, so that the rubber membrane of the expander 2 is filled with water until the elastic rubber membrane is kept close to a perfect circle, and the gas in the closed space 20 flows from the water outlet pipe 7 After draining, close the water inlet control valve 61 and check whether there is water leakage. If there is no water leakage, then after closing the water outlet control valve 71, open the water inlet control valve 6...

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Abstract

The invention discloses a small hole expansion test device and a test method thereof. An expander is buried in saturated soft clay; and a plurality of earth pressure boxes and pore water pressure sensors are arranged in the plane on which the cross section of an elastic film of the expander is located at intervals in a radial direction. The radial expansion of the elastic film is realized by controlling the internal pressure of the closed space, so that the mechanical behavior of the small hole expansion is simulated. Meanwhile, a monitoring device obtains data of a hydraulic sensor, a pore water pressure sensor and an earth pressure box to obtain the internal pressure change of the closed space before and after the elastic film expansion, changes of pore pressures around the elastic filmand the changing condition of the radial stress; auxiliary measurement assisted by surface displacement measurement for reference is performed to obtain the displacement changing condition of the topof the saturated soft clay before and after the elastic film expansion; and then data that are obtained by testing and include the pore pressure, radial stress and surface displacement are analyzed and calculated to obtain a constitutive model being capable of explaining small hole expansion in saturated soft clay accurately in an assisted manner.

Description

technical field [0001] The invention relates to the technical field of small hole expansion test, in particular to a small hole expansion test device and a test method thereof. Background technique [0002] When external objects (such as pile foundations, penetrating rods, etc.) are "pressed" into the rock-soil medium by force, the rock-soil medium at the original position will be "squeezed" away and cause displacement. Therefore, the deformed rock and soil mass produces pressure on the incoming object, and the stress field and displacement field of the rock and soil mass around the object will change. In order to explore the stress, displacement, pore water pressure and other changes of the rock-soil medium around the object due to the "squeeze" of external objects, the interaction between the end of the object and the rock-soil mass is simplified as the expansion of a spherical small hole, not the end. The interaction with the rock and soil mass is simplified to the expan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
CPCG01B21/02G01N1/286G01N3/12G01N15/0806G01N33/24G01N2203/0048
Inventor 马建军黄林冲梁禹赖正首
Owner SUN YAT SEN UNIV
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