Mechanical test instrument for surfaces of soil and structure and test method thereof

Abstract

The invention discloses a mechanical test instrument for surfaces of soil and a structure. The mechanical test instrument comprises a bracket, a control switch arranged on the bracket, a lifting mechanism fixed on the bottom plate of the bracket, a force measurement ring pressed at the top of the lifting mechanism, a container fixed at the top plate of the bracket, a lever pressed at the upper part of the container through a pressure transmission screw, a balance weight fixed at the rear end of the lever through a balance rod, and a weight hung at the front end of the lever. A strain measurement system is connected with a push rod in the container. According to the mechanical test instrument, the contact area of the soil and the structure within a measurement range in a test process can be guaranteed to be constant; the strain measurement system is used for measuring deformations of strain pieces in a strain piece group, so that real normal stress and shear stress on the interface of the soil and the cylindrical structure can be measured.

Description

technical field [0001] The invention relates to the field of mechanical stress testing, in particular to a mechanical testing instrument for soil and structural surfaces and a testing method thereof. Background technique [0002] At present, there are two main types of commonly used techniques for the mechanical properties of soil-structure contact surfaces: direct shear type and simple shear type. The direct shear type usually uses a soil body direct shear instrument to replace the rigid lower box of the soil body with a structural block , the rigid upper box contains the soil, and the shear strength between the soil and the structural surface is measured by conducting direct shear tests under different normal stresses, so as to calculate the friction angle and cohesion between the soil and the structural contact surface force parameter. The test method of the single shear type is similar to that of the direct shear type, but the rigid upper box is replaced by a stacked ri...

AI Technical Summary

Problems solved by technology

The direct shear type instrument system and test operation are relatively simple, but there are problems such as the gradual reduction of the contact surface area between the soil and the structure during the test process; the single shear type can ensure that the contact area remains unchanged during the test process, but the soil mass is prone to appear at the corners. Stress concentration, leading to inaccurate final conclusions

In addition, both direct shear and single shear measuring instruments can only measure the mechanical properties between the soil body and the planar structure

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