Study on prediction of surface movement boundary in near horizontal coal seam mining

Abstract

Predicting the impact of mining subsidence on the surface is an important link in the planning of ecological restoration and governance, and the drawing of contour map is the prerequisite for this link. Taking the mining of near horizontal coal seams as an example, using FLAC3D for numerical simulation, the calculation results only have the subsidence value and horizontal movement value, and there is no inclination, horizontal deformation and curvature values, and the contour map cannot be generated, which can not directly reflect the scope and degree of surface impact. To solve this problem, the simulation results are processed by FISH language programming, and the contour map is drawn in Surfer software. The results show that the critical horizontal deformation value of surface tension failure in Huobaoganhe Coal Mine is 2.15 mm/m; FISH code can extract the characteristic value of coal mining subsidence, and predict the outermost boundary of surface movement basin, surface dangerous movement boundary, surface movement fracture boundary and the range of cracks; the different advancing direction and mining sequence of the working face will lead to the unequal distance between the boundary of the surface movement basin and the boundary of the goaf.

Keywords

• flac3d
• surfer
• fish language
• surface movement and deformation
• surface movement boundary