Research on the fracture and mine pressure law of the overlying thick gravel rock in asymmetric fully mechanized longwall face
YANG Weili
HAN Enkui
LOU Zhishuai
Abstract：Based on the engineering background of the MZ21010 working face in the Yima Changcun Coal Mine,this paper studies the evolution of the overlying strata structure and the mine pressure laws by combining theoretical analysis,FLAC3 D numerical simulation and mine pressure monitoring methods.The research results show that the initial fracture step distance of the high-position and thick conglomerate rock is 592.08 m,indicating that the mine pressure of the working face before this was mainly affected by the movement and collapse of the low-position mudstone.The caving zone of the unsymmetrical working face shows an obvious ladder shape,and the height of the regional caving zone subjected to secondary disturbance is higher than that of other regular caving faces.The working resistance of the support curve is M shape in the early stage of the working face.As the working face continues to advance,its working resistance transforms into a single-peak shape and shows an asym-metric distribution.Outside the vertical mining influence zone,the average step of the first pressure on the working face is 53.15 m and the average step of the periodic pressure on the working face is 14.84 m.In the influence zone,the supports are under continuous roof-rake,and the peak value rea-ches the alarm value of 40 MPa multiple times.The research can provide reference for the selection of support and the optimization of support scheme.
Keywords：asymmetric fully mechanized caving surfacegiant thick conglomeratenumerical simu-lationlaw of ore pressure
Publication Date：2025-02-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 64-72 )