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Small hole expansion test device and test method

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

Active Publication Date: 2020-04-28
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
  • Small hole expansion test device and test method
  • Small hole expansion test device and test method

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 2-1 into one of the positioning holes, and then snap the first end cap 23 Insert another described positioning hole of the model box 1, to keep the cylindrical dilator 2-1 placed horizontally and firmly 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 21-1 of the cylindrical dilator 2-1 with water until the elastic membrane 21-1 keeps the surface even (the elastic membrane in this state The outer diameter of 21-1 is the above-mentioned initial outer diameter), and after the gas in the closed space 20-1 is exhausted from the outlet pipe 7, close the water inlet control valve 61, stop water injection and...

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 2-1 into a positioning hole, and snap the first end cover 23 into the Another positioning hole of the model box 1 is used to keep the cylindrical dilator 2-1 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 21-1 of the cylindrical dilator 2-1 with water until the elastic membrane 21-1 keeps the surface even, and make the closed space 20 After the gas of -1 is exhausted from the water outlet pipe 7, close the water inlet control valve 61, stop water injection and check whether the closed space 20-1 leaks, if there is no water leakage, then close the ...

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 2-2, place the spherical expander 2-2 in the small groove, and keep The spherical dilator 2-2 is placed horizontally and the water injection pipe 6 faces upward;

[0080] B. Open the water inlet control valve 61 of the spherical dilator 2-2, and open the water outlet control valve 71 at the same time, so that the rubber membrane of the spherical dilator 2-2 is filled with water until the elastic rubber membrane is kept close to a perfect circle, and the closed space After the gas in 20-2 is exhausted from the water outlet pipe 7, close the water inlet control valve 61 and check whether there is water leakage. -2 Inject water and pressurize to maintain a certain initial internal pressure inside the sp...

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Abstract

The invention discloses a pinhole expansion test device and method. The method comprises the steps: burying an expander in saturated soft clay, and arranging a plurality of soil pressure boxes and pore water pressure sensors on a plane where the cross section of an elastic membrane of the expander is located at intervals in the radial direction; realizing the radial expansion of the elastic membrane by controlling the internal pressure of the closed space, and simulating the mechanical behavior of pore expansion; acquiring the data of a hydraulic sensor, a pore water pressure sensor and a soilpressure box through a monitoring device, and obtaining the internal pressure change of the closed space before and after expansion of the elastic membrane, the change of the pore pressure around theelastic membrane and the change of the radial stress; obtaining the displacement change condition of the top of the saturated soft clay before and after expansion of the elastic membrane through auxiliary measurement of ground surface displacement measurement auxiliary reference; and finally, analyzing and calculating data such as pore pressure, radial stress, surface displacement and the like obtained by the test so as to assist in obtaining a constitutive model capable of accurately explaining pore expansion in the saturated soft clay.

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 Patents(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