Method for assessing the height and three-dimensional spatial development characteristics of water-conducting fissure zones in integrated medium-thickness coal seam mining

Abstract

It is of great significance to accurately grasp the development height of the water-conducting fissure zone (WCFZ) in the rock layer overlying mining airspace, which is of great importance for achieving safe mining of the working face in a mine. In this paper, data on the distribution characteristics of the WCFZs in 40 mines in China were collected, and multivariate linear fitting analysis of the data was carried out using the SPSS software to establish a prediction model for the height of a WCFZ in integrated medium-thickness coal seam mining. Taking working face 2108 in the Heilongguan Coal Mine in Shanxi as the research object, the quantitative interpretation of the development height and distribution characteristics of the WCFZ in the rock overlying the mining airspace was carried out using the method of actual measurement of the amount of leakage of water injected through the drilling holes and the fast Lagrangian code in 3 dimensions (FLAC3D) numerical simulation method to verify the validity of the prediction model for the height of the WCFZ in comprehensive medium-thickness coal seam mining. The study shows that A multivariate linear regression model for calculating the height of a WCFZ was established.The maximum vertical heights of the plastic deformation zones obtained from field tests of water injection leakage in actual engineering boreholes and numerical simulation methods are basically consistent with the results of the model proposed in this paper. the height and spatial development morphology of the WCFZ obtained using the three methods are in good agreement.