Overburden strata mining-induced fracture network model construction method

Abstract

The invention discloses an overburden strata mining-induced fracture network model construction method. The method comprises the following steps of: constructing a working surface mining model throughgrain flow numerical simulation software, and simulating a real working surface mining process by adoption of a distributed mining method; obtaining a collapse form and a porosity spatial-temporal distribution evolution law in the model in each mining period; and obtaining a porosity result by combining an image processing technology, real investigation of porosity in gobs in local point positionareas and PFC3D simulation, extracting rocks and fracture spaces of a two-dimensional image, and extracting gob fracture network distribution information on the basis of a three-dimensional reconstruction technology so as to establish an overburden strata mining-induced fracture network model. Through the method, dynamic representation of distribution processes of real fracture networks in miningprocesses can be rapidly realized on the basis of quantitative representation of macro-micro parameters of coal and rock masses.

Description

technical field [0001] The invention relates to the field of numerical simulation and image processing of mines in the field of mining safety, in particular to a method for constructing a network model of overburden mining fractures. Background technique [0002] The goaf is one of the important places where all kinds of disasters and accidents such as disaster prevention occur underground. In recent years, with the gradual reduction of shallow mine resources in my country, the depth of mine mining has increased year by year, and the mining intensity has gradually increased. Explosion accidents, roof water inrush, etc. have significantly increased the frequency of accidents and damage procedures in goafs, threatening the safe and efficient production of mines. [0003] The occurrence of the above-mentioned disasters is closely related to the formation and distribution process of the goaf fracture network, especially its three-dimensional space characteristics. In recent years...

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Problems solved by technology

[0003] The occurrence of the above disasters is closely related to the formation and distribution process of the goaf fracture network, especially its three-dimensional space characteristics. In recent years, scholars at home and abroad have adopted various methods for the goaf fracture network, mainly focusing on theoretical analysis, Similar material simulation experiments and other methods, but the above methods are more affected by human factors, and cannot truly characterize the spatial development process of overlying rock mining fractures. Therefore, the existing technology needs further improvement and development

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