断层对地应力场方向的扰动规律及反演分析方法

doi:10.13722/j.cnki.jrme.2019.1228

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Abstract Faults in underground engineering areas have complex influences on the direction of local stress field. In order to accurately obtain the distribution of in-situ stress field due to fault disturbance，a two-stage inversion analysis method based on equivalent tectonic load is presented. Firstly，based on qualitative cognition and a simple numerical experiment，the deflection laws of the principle stress direction near a fault are analyzed for providing a judgment basis of identifying the abnormal measured stress data affected by the fault. Secondly，mainly considering the influence of valley topography，the improved lateral pressure coefficient method is applied to invert the in-situ stress field of big model，and then，a refined small model with faults is built. The equivalent tectonic load is obtained by the stress field calculated by interpolation from the big model，and the second-stage inversion calculation for in-situ stress is conducted based on elastic-plastic theory. Finally，the in-situ stress field of Jinchuan underground powerhouse area is inverted based on the measured in-situ stress data，verifying that the abnormal data at point #3 are affected by the fault，and the distribution laws of the stress field near the faults are studied. The results indicate that the local stress field direction deflects differently inside and outside the fault and has a significant relationship with the occurrence of the fault. The inversion method can comprehensively consider the influences of valley topography，fault and complex tectonism，has a high inversion accuracy to measured data and can better reflect the non-uniform characteristics of stress magnitude and direction near faults.

Key words： underground engineering fault in-situ stress field direction lateral pressure coefficient inversion analysis

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	Articles by authors
	CHEN Shijie1
	2
	XIAO Ming1
	2
	CHEN Juntao1
	2
	REN Junqing1
	2

Cite this article:

CHEN Shijie1,2,XIAO Ming1, et al. Disturbance law of faults to in-situ stress field directions and its inversion analysis method#br#[J]. , 2020, 39(7): 1434-1444.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1228 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I7/1434

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