Soil mass shearing rupture failure testing device and method

Abstract

The invention discloses a soil mass shearing rupture failure testing device which comprises a base, a front baffle plate, a thrust providing device, a load sensor, a displacement sensor and a data acquirer. A soil mass shearing rupture failure testing method comprises the following steps of: (1) putting a test sample on a second slide track between the front baffle plate and the thrust plate; (2) starting the thrust providing device, applying a pressure to the test sample, and recording; and (3) generating a curve graph of the stress and the deformation of the test sample. The test sample is put on the base between the thrust plate and the front baffle plate, the front baffle plate and the thrust plate are arranged at the left and right sides of the crack of the test sample, the thrust plate applies thrust to one side of the test sample, opposite to the thrust plate; and the test sample is blocked by the front baffle plate so as to prevent the test sample from sliding. with the crack as a boundary, the left and right sides of the test sample takes are subjected to two forces in opposite directions till the test sample is damaged. The forces acting on the test sample in the test sample can be read through the load sensor, the deformation position can be read through the displacement sensor, the test process is simple, and the read test result is not influenced by the operation error and the friction and is high in accuracy.

Description

technical field [0001] The invention relates to the technical field of soil fracture tests, in particular to a test device and method for soil shear fracture damage. Background technique [0002] Cracked soil is a discontinuous medium, and its failure description and criterion should be established based on the discontinuous medium. In fracture mechanics, crack propagation can be divided into three basic types according to its stress state, namely: opening type (or tensile type), sliding type (or shearing type) and tearing type (or torsional shearing type). ). In soil fracture damage, two types of tensile type and shear type are mainly considered, and the present invention only relates to the shear type. [0003] In the shear fracture failure of soil, when the stress intensity factor K of the crack body II Reach the type II fracture toughness K of the material IIC , the crack will propagate forward. Therefore, to test the mode II fracture toughness K of the excavated bo...

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Problems solved by technology

but from attached figure 2 It can be seen that due to the influence of the self-weight of the soil above the crack surface, there is friction caused by the self-weight of the soil sample on the crack surface during the test, which may affect the test results, so this method also has shortcomings

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