Apparatus and method for soil arch test

Abstract

The invention discloses an apparatus for a soil arch test under multiple test conditions. The apparatus comprises a test model case, a displacement plate control device and a movable base plate angle control device. The displacement plate control device adjusts a displacement plate drive screw to control the unloading level of soil. The movable base plate angle control device adjusts a movable base plate drive screw to control the positions of a pi-shaped plate and an L- shaped plate and can adjust the inclination angle of a movable base plate so as to change the initial stress state of a soil sample (wherein the direction of initial principal stress of the soil sample differs as the angle of the base plate changes.) The apparatus provided by the invention is convenient to dismount and assemble and can use displacement plates with different widths to realize soil arch tests with different unloading scales. The apparatus has a simple structure and good operation repeatability, can be used for research on soil arching internal stress and displacement distribution under a plurality of test conditions and provides accurate analysis data for theoretical and practical engineering research.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, in particular to a soil arch test research instrument. Background technique [0002] Soil arching is common in geotechnical engineering, such as tunnel excavation, foundation pit engineering, and pile network foundations. The Platts theory for calculating the surrounding rock pressure is based on the soil arch effect theory, which is also used in the research of the soil pressure of the retaining wall, the bearing capacity of pile-supported embankments, and the spacing of anti-slide piles. Due to the importance of the soil arch effect theory, scholars have conducted a large number of experimental studies on the soil arch phenomenon, the most classic of which is the movable door test conducted by Terzaghi. The rigid baffles at both ends of the experimental device have no displacement, angle variable, and the soil in the test did not form a free free surface. Based on this test, many soil ...

AI Technical Summary

Problems solved by technology

It can be found that the condition of the soil arch effect indoor test is often a single change to the displacement plate, but in actual engineering, the load transfer effect of the soil arch will often increase the support pressure at the foot of the arch, and the increase in local pressure will cause Supporting structure tilted

Therefore, it is necessary to provide a new soil arch tester, which can simulate as many soil arch phenomena as possible in actual engineering, so as to solve the problem of single test conditions in the existing soil arch laboratory test

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