Fault activation discrimination method and stability evaluation of 0291 working face in Tangshan mine
YANG Changyi
SHI Haoyu
GUAN Shufang
JIANG Zhigang
WANG Yongjian
Abstract：The existence of fault structures disrupts the integrity of nearby coal and rock formations,causing changes in stress characteristics of the working face during mining process compared to normal geological min-ing.In order to ensure the safety passage of Tangshan mine 0291 working face passing through the fault,con-sidering factors such as the magnitude and direction of the in-situ stress,fault plane attitude,and fault me-chanical parameters,a criterion equation for fault stability is established to obtain the criterion value,f.When f is less than 0,the fault is relatively stable,and when f approaches 0,the fault is in a critical unstable state.By using the FLAC3D numerical simulation software,a numerical model of the 0291 working face mining is estab-lished.The simulation results show that under mining-induced stress,stress concentration phenomenon are evident 5 and 30 meters ahead of the working face,with significant impacts on the faults within the working face range.The stress peak occurs at the position 10 meters ahead of the working face.Monitoring measure-ment points are established to extract in-situ stress data within the working face range.The f values of 12 faults within the 0291 working face is calculated according to the theoretical calculations mentioned in the pa-per.The results show that the f values of the faults within the working face are all less than 0,indicating rela-tive stability and minimal activation during the mining process.
Keywords：fault activationslip criterionground stress statestability evaluation
Publication Date：2024-02-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 12-19 )