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A device capable of real-time measurement of the change in the pressure and displacement of the limited backfill during translation of the retaining wall

A real-time measurement and displacement change technology, which is applied in the testing of infrastructure, water conservancy projects, artificial islands, etc. It can solve the problems of little model test research, and achieve the effect of simple structure, convenient operation and easy to master.

Inactive Publication Date: 2017-02-22
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few model test studies on the law of soil pressure and displacement variation of limited fill retaining walls during translational motion

Method used

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  • A device capable of real-time measurement of the change in the pressure and displacement of the limited backfill during translation of the retaining wall
  • A device capable of real-time measurement of the change in the pressure and displacement of the limited backfill during translation of the retaining wall
  • A device capable of real-time measurement of the change in the pressure and displacement of the limited backfill during translation of the retaining wall

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: its front and rear sides of transparent plexiglass model box 1 are 500mm long and 400mm wide, and the left side is 400mm long and 200mm wide, and the bottom surface is 500mm long and 200mm wide, and the plexiglass plate thickness is 10mm; L The glyph concrete pouring block 2 has a length of 530mm, a width of 200mm, a height of 380mm, and a thickness of 80mm; the zigzag groove 3 has a depth of 5mm, a length of 200mm, a width of 10mm, and an interval of 10mm; the height of the retaining wall 4 is 300mm, The upper bottom is 40mm, the lower bottom is 80mm, and the width is 200mm.

[0024] Using this embodiment, the model test device for real-time measurement of the limited fill pressure and deformation of the retaining wall during translation, the test method is as follows:

[0025] a. Install the test device according to the diagram, and calibrate the stress sensing film 6 and the axial force sensor 7;

[0026] b. Compacting the prefabricated soil body 12 ...

Embodiment 2

[0035] Embodiment 2: This embodiment is basically the same as Embodiment 1, the special point is that in this embodiment, the inclination angle of the steel plate 11 is changed, that is, the steel plate 11 is obliquely placed in different sawtooth grooves 3 . It can be used to study the influence of the inclination angle of different limited fill slopes on the soil pressure and displacement when the retaining wall moves in translation.

Embodiment 3

[0036] Embodiment 3: This embodiment is basically the same as the previous embodiment, and the special feature is that in this embodiment, the translation direction of the retaining wall 4 is changed, even if the SDJ-1 three-speed electric strain control shearing instrument has 8 directions The left translation can be used to study the change law of soil pressure and displacement when the limited fill soil is passively damaged.

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Abstract

The invention relates to a device capable of measuring limited filling pressure and displacement change in the translation process of a retaining wall in real time. The device comprises a limited filling model case system, a retaining wall translation system and a particle image velocimetry (PIV) testing system. According to a testing device, the natural stress state of the limited filling retaining wall in the translation process can be simulated really, that is to say, the stress state of the soil body in the test process is the same as that in practical engineering; high-precision soil pressure sensors are arranged on the retaining wall at equal height intervals, so that soil pressure of limited filling can be measured in real time; a high-precision camera is arranged right ahead a model case, and soil body displacement images in the whole translation process of the retaining wall can be measured in real time through the utilization of a PIV technology at the same time. According to the device, the model testing device is convenient to operate, and the related instruments are simple in structure and easy to control.

Description

technical field [0001] The invention relates to a geotechnical model test device for civil engineering, in particular to a device capable of real-time measurement of limited filling soil pressure and displacement changes during translational motion of a retaining wall, which is applied to geotechnical tests of geotechnical engineering. Background technique [0002] Calculation of earth pressure acting on structures is a key issue in engineering design of geotechnical engineering discipline. Classical Coulomb and Rankine earth pressure theories and their empirical formulas are used in the design of retaining walls and foundation pit support structures. Classical theory assumes that there is a semi-infinite soil mass behind the wall, and the deformation of the soil mass reaches the limit state. In actual engineering design, the displacement of the retaining wall is often limited by the allowable displacement. In many retaining projects, the width of the filling soil before an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D33/00E02D29/02
Inventor 姜彤张俊然李洪军王忠福张昕郭萌萌
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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