Similar simulation experiment platform and method for butterfly-shaped damage zone in roadway

Abstract

Disclosed are a similar simulation experiment platform and method for a butterfly-shaped damage zone in a roadway. The experiment platform includes a main frame, four pressing plates and four sets ofjacks; the four jack sets comprise a plurality of jacks which are equidistantly arranged, and the jacks are controlled uniformly or separately; the center of a similar model is provided with a prefabricated hole for simulating the roadway, and the prefabricated hole is formed through a mold. The method comprises the steps of constructing the experiment platform and preparing the similar model; applying vertical load to the similar model for simulating the maximum or minimum principal stress of the roadway, and applying horizontal load to the similar model for simulating the minimum or maximumprincipal stress of the roadway; adjusting the ratio of the maximum principal stress to the minimum principal stress, and observing the shape of the damage zone around the prefabricated hole; changingthe direction of the maximum or minimum principal stress to enable the damage zone around the prefabricated hole to rotate. Before the similar model is prepared, a small-sized sample is prepared in advance, and the uniaxial compressive strength of the similar model is obtained and serves as a reference safety limit value for similar simulation experiments.

Description

technical field [0001] The invention belongs to the technical field of physical similar simulation experiments, and in particular relates to a similar simulation test platform and an experimental method for a butterfly-shaped damage zone in a roadway. Background technique [0002] The roadway plays a vital role in coal mines, and it is of great significance to study the damage shape of the roadway surrounding rock damage zone and take reasonable support measures for the roadway. Through physical similar simulation experiments, the surrounding rock properties, initial stress state and boundary conditions of the roadway can be simulated. By simulating the on-site stress environment and applying stress to deform the roadway surrounding rock, the broken ring shape of the roadway surrounding rock damage zone can be observed. . [0003] For the failure form of the surrounding rock of the roadway, it is essentially an elastic-plastic problem of the surrounding rock of the roadway ...

AI Technical Summary

Problems solved by technology

However, there are still some deficiencies in the three-dimensional geomechanics test rig. Due to the large size of the test rig, it is difficult to operate during the experiment, and the test rig cannot be easily moved, resulting in extremely poor flexibility of the test rig, and the size of similar models is relatively small. Large, resulting in a large amount of similar materials used, and at the same time, the 3D geomechanics test bench needs a long time to build, and the curing time of similar models in the test bench is also long, resulting in a long test cycle

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