深埋走滑断层错动作用下岩体变形特征及其受地应力的影响

doi:10.3724/1000-6915.jrme.2025.0056

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Abstract Fault dislocation leads to significant deformation in rock masses, resulting in the damage of deeply buried structures such as tunnels. This study aims to investigate the deformation characteristics of rock masses caused by fault dislocation and the influence of geostress under deep-buried conditions. Using the central Yunnan water diversion project as a case study, a physical model test of deep-buried strike-slip fault dislocation to examine the deformation characteristics of rock masses is first conducted. Subsequently, a nonlocal model for numerical simulation to analyze the impact of geostress on rock mass deformation is applied. The results are as follows: (1) Under fault dislocation, the main fracture develops within the fracture zone, and the fault undergoes shear movement along this main fracture. (2) Rock mass displacement decreases from the footwall to the hanging wall, with displacement distribution showing partitioning near the main fracture and exhibiting an S-shaped pattern. The equivalent strain localization band develops within the fracture zone, and the strain distribution curves exhibit a single-peak pattern. (3) Soil pressure decreases near the main fracture, increases on the footwall, and remains constant on the hanging wall. (4) The nonlocal model effectively reproduces the test results, showing that geostress affects the angle of the equivalent strain localization band and the peak strain. This research enhances the understanding of rock mass deformation under fault dislocation, provides a basis for analyzing the failure characteristics of deeply buried tunnels, and offers guidance for the construction design of cross-fault deep-buried tunnels.

Key words： rock mechanics fault dislocation;model test;deformation characteristics of rock mass;numerical simulation;nonlocal model influence of geostress

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	Articles by authors
	ZHANG Ning1
	2
	ZHOU Hui1
	2
	GAO Yang1
	2
	ZHU Yong1
	2
	LU Jingjing1
	2
	ZHAO Chengwei1
	2
	CHENG Guangtan3

Cite this article:

ZHANG Ning1,2,ZHOU Hui1, et al. Deformation characteristics of rock mass under dislocation of deep-buried strike-slip fault and its influence by geostress[J]. , 2025, 44(6): 1500-1513.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0056 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I6/1500

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[27]	BLABER J，ADAIR B，ANTONIOU A. Ncorr：open-source 2D digital image correlation Matlab software[J]. Experimental Mechanics，2015，55(6)：1 105-1 122.
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[30]	LÜ X，BARDET J P，HUANG M. Numerical solutions of strain localization with nonlocal softening plasticity[J]. Computer Methods in Applied Mechanics and Engineering，2009，198(47/48)：3 702-3 711.
[31]	DI LUZIO G，BA?ANT Z P. Spectral analysis of localization in nonlocal and over-nonlocal materials with softening plasticity or damage[J]. International Journal of Solids and Structures，2005，42(23)：6 071-6 100.
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