Overburden rock damage zoning and height determining method based on penetration-damage relation

Abstract

The invention provides an overlying strata damage zoning and height determining method based on a penetration-damage relation, and relates to the technical field of overlying strata damage zoning and height prediction of mine stopes. The overlying strata damage zoning and height determining method based on the permeation-damage relation comprises the following steps that 1, rock stratum distribution and ground stress environment investigation is conducted; 2, preparing a test piece; step 3, carrying out triaxial compression-seepage test on rocks at different rock layer positions; step 4, establishing a damage-permeation relationship; 5, overlying strata damage area division based on the damage-permeability relation; step 6, constructing a damage constitutive relation; step 7, embedding the damage constitutive relation into FLAC3D software; 8, establishing a numerical model; and 9, determining the height of each damage area through numerical simulation. According to the overlying strata damage zoning and height determining method based on the penetration-damage relation, damage area division and height determination can be carried out on a working face roof after working face mining.

Description

technical field [0001] The invention relates to the technical field of overlying rock damage division and height prediction in mine stope, in particular to a method for overlying rock damage division and height determination based on the seepage-damage relationship during water-retaining mining. Background technique [0002] After the coal seam working face is mined, the movement and deformation of the overlying rock will cause fracture damage, and the damage of the rock formation at different layers is also different. Subsidence and loss of aquifer water. Especially in the western mining area where the ecological environment is fragile in my country, the mining of shallow coal seams will lead to the loss of valuable surface water and endanger the ecological environment safety of the mining area. [0003] The loss of water above the working face is directly related to the damage degree of the water-resisting rock layer. When the cracks in the damaged rock layer are connecte...

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Problems solved by technology

[0005] The key to accurately judging the water-conducting range of the overlying rock by the numerical simulation method is based on the constitutive relationship that accurately describes the deformation and damage behavior of the rock mass. Since the theoretical model that comes with the current numerical simulation software has been simplified to a certain extent, although it has a certain degree of universality, However, to a certain extent, the accuracy of rock formation failure simulation is affected. Therefore, it is necessary to establish a constitutive relationship suitable for describing the mechanical behavior of soft rock in the western mining area and realize its secondary development in the simulation software, so as to accurately simulate the development degree of overlying rock damage. and range

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