Fractal research method for evolution of overlaying strata fracture based on two-dimensional simulation test stand

Abstract

The present invention discloses a fractal research method for evolution of an overlaying strata fracture based on a two-dimensional simulation test stand, comprising the following steps: (1) establishing a similar simulation test stand and setting a high-definition camera; (2) acquiring extension and development characteristics digital images of the overlaying strata fracture on the similar simulation test stand at different stages in the process of excavation; (3) processing the digital images acquired at each stage to obtain extension and development characteristics binary images of the upper overlaying strata fracture; (4) processing the obtained extension and development characteristics binary images of the upper overlaying strata fracture to obtain fractal dimension values of the extension and development characteristics of the upper overlaying strata fracture; (5) using a least square fitting in the fractal dimension to obtain a development characteristics fractal dimension fitting curve of the overlaying strata fracture; and (6) obtaining a relation curve between the fractal dimension and the extension and development characteristics of the overlaying strata fracture at eachstage. The invention achieves quantitative description on the morphological development of the fracture network field caused by migration of the overlaying strata, and finally provides the managementbasis for the morphological development of the overlaying strata fracture network under high-intensive mining.

Description

technical field [0001] The invention relates to a fractal research method for crack evolution of overlying rock based on a two-dimensional simulation experiment platform, and mainly relates to a fractal research method for crack evolution of overlying rock after simulated excavation by laboratory tests. Background technique [0002] With the development of science and technology, the mining process, technology, and equipment have been significantly improved, and the mining volume of coal mines has continued to increase. Many mines have begun to increase mining heights and rapidly promote coal mining, resulting in increased damage to the overlying strata and cracks. Completely or the overlying thin bedrock layer is completely cut off along the roof, and the break directly penetrates to the surface, forming obvious mining subsidence subsidence pits and cracks, and some cracks and cracks penetrate the aquifer or surface water system, causing mine water inrush and sand collapse d...

AI Technical Summary

Problems solved by technology

[0002] With the development of science and technology, the mining process, technology, and equipment have been significantly improved, and the mining volume of coal mines has continued to increase. Many mines have begun to increase mining heights and rapidly promote coal mining, resulting in increased damage to the overlying strata and cracks. Completely or the overlying thin bedrock layer is completely cut off along the roof, and the break directly penetrates to the surface, forming obvious mining subsidence subsidence pits and cracks, and some cracks and cracks penetrate the aquifer or surface water system, causing mine water inrush and sand collapse disasters Because some cracks and fissures directly penetrate the goaf, the surface air enters the goaf, which eventually leads to an increase in the concentration of carbon monoxide or a spontaneous combustion disaster in the goaf, which seriously affects the normal mining of the entire coal mine safety.

At the same time, it will cause varying degrees of damage to the ecological environment and surface buildings in the local area.

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