Device for support side pressure testing model during stratified unloading and nonuniform lateral displacement and a method based on device

A test model, non-uniform technology, applied in the field of indoor model test system, can solve the problems of few layers, large one-time unloading depth, and rare experimental devices for earth pressure on support structures

Active Publication Date: 2017-11-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Up to now, there are not many test devices for studying the unloading soil pressure of excavation at home and abroad, and the number of layers is small, and the one-time unloading depth is too large, which makes it difficult to simulate the actual working conditions; Experimental setups for earth pressure are even rarer

Method used

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  • Device for support side pressure testing model during stratified unloading and nonuniform lateral displacement and a method based on device
  • Device for support side pressure testing model during stratified unloading and nonuniform lateral displacement and a method based on device
  • Device for support side pressure testing model during stratified unloading and nonuniform lateral displacement and a method based on device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Such as Figure 1-Figure 9 As shown, a model device for lateral pressure testing of layered unloading and non-uniform side shift support, including: spliced ​​retaining wall 1, loading unit 2, loading bend 3, rib ruler groove frame 4, loading frame 5, and loading frame reinforcement Part 6, return spring 7, triangular diagonal brace 8, model box 9, miniature earth pressure sensor 10, rubber film 11.

[0088] Such as figure 1 , figure 2 As shown, the model box 9 is a rectangular parallelepiped box with one end side wall missing, spliced ​​retaining wall 1, bolt loading part 2, rib ruler groove frame 4, loading frame 5, loading wedge ruler 15, return spring 7, triangular diagonal brace The frame 8 and the miniature earth pressure sensor 10 are all arranged on the missing end of the side wall of the model box; the model box bracket 22 is located below the model box 9, and is connected with the model box 9 bottom plate by bolts.

[0089] As a preferred embodiment, the n...

Embodiment 2

[0139] Based on the device structure of the above-mentioned embodiment 1, a kind of indoor simulated foundation pit layered excavation soil pressure test model test method is provided, such as Figure 10-16 shown. Including the following steps:

[0140] (1) According to the actual setting of the layered number n of foundation pit excavation and the depth hi of each excavation, according to the method in Example 1, determine the size of the ribbed wall unit, the size of the loading wedge and other experiments The parts of the device are constructed and assembled in place;

[0141] (2) Zero adjustment, filling the model box with sand: Manually twist the loading handles of each loading unit directly, so that the scale of each loading wedge is at the zero position, and then evenly fill the model box with sand to a predetermined height.

[0142] (3) Manually turn the loading handle corresponding to the ribbed wall unit of the first layer outward until the limit displacement Sa1=S...

Embodiment 3

[0147] Based on the device structure of the above-mentioned embodiment 1, a kind of indoor simulation non-uniform displacement working condition soil pressure test model test method is provided, such as Figure 10-16 shown. Including the following steps:

[0148] (1) According to the accuracy requirements of the simulation and the cumbersome shape of the fabrication and operation of the ribbed wall unit, loading wedge, loading bolt and other components, the number of sections of the spliced ​​retaining wall should be selected, at least not less than 10, and it is not suitable more than 20;

[0149] (2) According to the method calculation in embodiment 1, make, assemble each part of experimental device;

[0150] (3) Manually twist the loading handles of each loading unit so that the scales of each loading wedge are at the zero position, and then evenly fill the model box with sand and soil to a predetermined height in layers;

[0151] (4) According to the predetermined non-u...

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Abstract

The invention provides a device for a support side pressure testing model during stratified unloading and nonuniform lateral displacement and a method based on the device. The device comprises a triangular diagonal bracing rack, a loading frame, a rib slot rack, a loading unit, a loading crutch, a return spring, a spliced retaining wall, a micro-soil pressure sensor, a rubber film and a model box; and the method is based on the device. The device provided by the invention can simulate the lateral pressure of a support structure in a process of stratified excavation and unloading of a foundation pit, provide a basis for engineering design and support, research a distribution law of the lateral pressure of the support structure and a law of variation with displacement during nonuniform displacement, particularly, control the lateral displacement of the retaining wall at each depth accurately, and load the passive displacement of the retaining wall with relatively small loading thrust force.

Description

technical field [0001] The invention relates to an indoor model test system and test method of geotechnical engineering, in particular to a model device and method for testing lateral pressure of layered unloading and non-uniform lateral displacement support. Background technique [0002] The foundation pit is gradually excavated and unloaded. The distribution law of the earth pressure on the support structure is an important content of the foundation pit engineering research, and it is also the basis for the design of the foundation pit support. The change law of the earth pressure of the support structure with the excavation process is also a important scientific issues in soil engineering. [0003] There are many studies on the earth pressure of rigid retaining walls. In actual engineering, in addition to gravity retaining walls, other supporting structures will undergo deflection and deformation during use, reflecting the characteristics of flexible retaining walls. Non...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01L5/00
CPCG01L5/0028G01N3/08G01N2203/0676
Inventor 熊国军王建华廖晨聪
Owner SHANGHAI JIAO TONG UNIV
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