An experimental platform for three-dimensional simulation of coal mine roof fracture

Abstract

The invention discloses an experimental platform for three-dimensional simulation of coal mine roof breaking, relating to the field of mine ground pressure research. The experimental platform comprises a roof, a roof pressurizing device and a coal seam simulation control device, wherein the coal seam simulation control device controls a coal seam model to realize the simulation of up-and-down fluctuations of a coal seam in a coal mining process, the roof pressurizing device comprises a lower boundary frame, an upper boundary frame, a pressing component and a topless transparent cover, a roof placing area is located above the lower boundary frame, the topless transparent cover covers the upper boundary frame, the upper boundary frame is arranged above the roof, the pressing component presses and fixes the upper surface of the roof through the upper boundary frame, and the space of the topless transparent cover on the upper boundary frame is used for water injection. According to the scheme of the invention, similar materials can be laid according to the geological conditions, the actual geological conditions at the site can be restored to a maximum extent, the scheme is suitable forthe three-dimensional observation of roof breaking under various geological conditions, the experimental process is transparent and visible, and thus the scheme is conducive to the comprehensive summary and exploration of a roof breaking rule.

Description

technical field [0001] The invention relates to the field of mine pressure research, in particular to an experimental platform for three-dimensionally simulating coal mine roof breakage. Background technique [0002] Coal is the main energy source in our country. Safety, greenness and high efficiency are important indicators of coal mining. The research on mine pressure is the key to ensure high yield, high efficiency and safe production. The observation of the roof fracture law is to use similar materials to restore the mining process under a certain geological condition as much as possible, and to observe the roof collapse and deformation. The length of the working face model, observing the deformation of the roof, monitoring the stress and strain in the rock formation and the development of cracks, and then analyzing the relationship between the deformation of the roof, the basic roof thickness, and the length of the working face. [0003] At present, the research on min...

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Problems solved by technology

Among them, the on-site measurement environment is harsh, the data are highly discrete, and are seriously affected by the geological conditions of a certain area, making it difficult to obtain general laws; while the numerical analysis method requires an accurate understanding of the geological conditions, and is affected by the data, the calculation accuracy is difficult to determine; As for the similar simulation experiment, although the deformation of the roof can be observed more intuitively, this experimental method is difficult to achieve continuous and uniform loading due to the influence of the material, and it is difficult to observe the interior of the 3D model. Moreover, the model size is single and fixed, and the scope of application is limited, which is not conducive to the roof fracture. rule of thumb

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