A calculation methodology of fault relative displacement used to study the mechanical characteristic of fault slip. (9th December 2021)

• Record Type: Journal Article
• Authors: Wang, Hongwei; Shi, Ruiming; Deng, Daixin; Cui, Fan; Jiang, Yaodong
• Is Part Of: Journal of geophysics and engineering. Volume 18:Number 6(2021)
• Page Start: 920
• Page End: 942
• Publication Date: 2021-12-09
• Subjects: fault relative slip -- physical model -- point-by-point integration -- extra-thick rock strata; Geophysics -- Periodicals; Prospecting -- Geophysical methods -- Periodicals; Engineering -- Periodicals; 622.1505
• DOI: 10.1093/jge/gxab063
• Languages: English
• ISSNs: 1742-2132

Abstract

Abstract: Fault slip caused by mining disturbance is a crucial issue that can pose considerable threats to the mine safety. This paper proposes a point-by-point integration calculated methodology of fault relative slip and studies fault instability behavior induced by coal seam mining. A physical model with the existence of a fault and an extra-thick rock stratum is constructed to simulate the fault movement and calculate relative slip using the methodology. The results indicate that the fault relative slip can be regarded as a dynamic evolution process from local slip to global slip on the fault surface. The movement of surrounding rock masses near the fault experiences three stages, including along vertical downward, parallel to the fault and then approximately perpendicular to the fault. There will be an undamaged zone in the extra-thick rock strata when the mining face is near the fault structure. The collapse and instability of this undamaged zone could induce a violent fault relative slip. In addition, the influence of dip angles on the fault relative slip is also discussed. A formula for risk of fault relative slip is further proposed by fitting the relative displacement curves with different fault dip angles.