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Influence of complicated faults on the differentiation and accumulation of in-situ stress in deep rock mass

International Journal of Minerals,Metallurgy and Materials 2023年第5期30卷 791-801页

作者： Naigen Tan Renshu Yang Zhuoying Tan Beijing Key Laboratory of Urban Underground Space Engineering School of Civil and Resource EngineeringUniversity of Science and Technology BeijingBeijing 100083China

High geostress will become a normality in the deep because in-situ stress rises linearly with *** geological structure grows immensely intricate as depth ***,small fractures,and joint fissures are widely *** objective of this paper is to identify geostress anomalies at a variety of locations near faults and to demonstrate their accumulation *** tests were conducted in seven deep *** conducted a test at a drilling depth of over one thousand meters to reveal and quantify the influence of faults on in-situ stresses at the hanging wall,footwall,between faults,end of faults,junction of faults,and far-field of *** effect of fault sites and characteristics on the direction and magnitude of stresses has been investigated and compared to test *** accumulation heterogeneity of stresses near faults was illustrated by a three-dimensional numerical simulation,which is utilized to explain the effect of faults on the accumulation and differentiation of in-situ *** to regional tectonics and faulting,the magnitude,direction,and stress regime are all extremely *** concentration degree of geostress and direction change will vary with the location of faults near faults,but the magnitude and direction of in-situ stress conform to regional tectonic stress at a distance from the *** focal mechanism solution has been verified using historical seismic ground motion *** results demonstrate that the degree of stress differentiation varies according to the fault attribute and its *** in stress differentiation and its ratio from strong to weak occur between faults,intersection,footwall,end of faults,and hanging wall;along with the sequence of orientation is the footwall,between faults,the end of faults,intersection,and hanging *** work sheds new light on the fault-induced stress accumulation and orientation shift mechanisms across the entire cycle.

关键词： fault geostress in deep magnitude and direction of geostress mining dynamic hazards stress accumulation mining optimization

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