Three-dimensional similar material model experimental device and method for simulating coal seam mining

Abstract

The invention discloses a three-dimensional similar material model experimental device and method for simulating coal seam mining. The device comprises a frame structure, a hydraulic loading control component and a monitoring component. The device uses a digital intelligent control uniform loading system to simulate a model space stress field, reduces the influence of a boundary effect, achieves areal stress loading boundary condition, uses a similar material space excavation simulation technology to simulate the similar material mining in a closed space working face, monitors a field space stress and overburden strata space movement law in real time in the mining process by a multi-monitoring system, solves the measurement problem of the three-dimensional similar material simulation experiment, controls data recording and storage by a computer, and reduces the workload of experimenters. The whole experimental device is easy and convenient to use, low in labor intensity and high in measurement precision, and greatly promotes the use of three-dimensional similar simulation experiments.

Description

technical field [0001] The invention belongs to the technical field of simulation experiments of coal seam similar materials, and in particular relates to a three-dimensional similar material model experiment device and method for simulating coal seam mining. Background technique [0002] Similar material simulation is the main test method of geotechnical engineering and mining engineering, and has become one of the indispensable methods for the feasibility study of major rock mass engineering at home and abroad in recent years. The similar material simulation experiment is to use similar materials in the laboratory, according to the field histogram and the physical and mechanical properties of coal and rock mass, according to the similarity theory and similarity criteria, to make a model similar to the field, and then simulate mining; in the process of simulated mining, through The detection instrument continuously monitors the movement of the roof and the distribution of t...

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Problems solved by technology

[0005] (1) Most of the models are small in size and mostly adopt rigid loading, which is difficult to achieve uniform loading, which is different from the actual engineering stress distribution, and some tests adopt the physical process of excavating first and then increasing confining pressure step by step to the design load. There are essential differences in the actual engineering process;

[0006] (2) During the experiment, it is necessary to manually excavate the coal seam with tools such as steel chisels, which is labor-intensive and disturbs the overlying strata greatly, making the excavation imprecise;

[0007] (3) The experimental excavation starts from a certain boundary, which is greatly affected by the boundary conditions and cannot realize the mining of confined spaces;

[0008] (4) In similar simulation experiments, the movement of rock strata occurs inside the model, and previous observation methods cannot directly obtain rock stratum change parameters

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