Distribution patterns of rock mass displacement in deeply buried areas induced by active fault creep slip at engineering
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Distribution patterns of rock mass displacement in deeply buried areas induced by active fault creep slip at engineering scale ZHANG Chuan-qing(张传庆)1, 2, LIU Xiao-yan(刘小岩)1, 2, ZHU Guo-jin(朱国金)3, ZHOU Hui(周辉)1, 2, ZHU Yong(朱勇)1, 2, WANG Chao(王超)3 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Power China Kunming Engineering Corporation Limited, Kunming 650000, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: Active fault creep slip induces deformation of rock mass buried deeply in fault zones that significantly affect the operational safety of long linear projects passing through it. Displacement distribution patterns of rock masses in active fault zones which have been investigated previously are the key design basis for such projects. Therefore, a discrete element numerical model with different fault types, slip time, dip angles, and complex geological features was established, and then the creep slip for normal, reverse, and strike-slip faults were simulated to analyze the displacement distribution in the fault rock mass. A disk rotation test system and the corresponding laboratory test method were developed for simulating rock mass displacement induced by creep slippage of faults. A series of rotation tests for softand hard-layered specimens under combined compression and torsional stress were conducted to verify the numerical results and analyze the factors influencing the displacement distribution. An S-shaped displacement distribution independent of fault dip angle was identified corresponding to reverse, normal, and strike-slip faults. The results indicated that the higher the degree of horizontal extrusion, the softer the rock mass at the fault core, and the higher the degree of displacement concentration in the fault core; about 70% of the creep slip displacement occurs within this zone under 100 years of creep slippage. Key words: active faults; creep slip; displacement distribution patterns; discrete element; rotation test Cite this article as: ZHANG Chuan-qing, LIU Xiao-yan, ZHU Guo-jin, ZHOU Hui, ZHU Yong, WANG Chao. Distribution patterns of rock mass displacement in deeply buried areas induced by active fault creep slip at engineering scale [J]. Journal of Central South University, 2020, 27(10): 2849−2863. DOI: https://doi.org/10.1007/s11771-0204514-8.
1 Introduction Permanent ground displacement due to fault rupture would cause serious damage to tunnels or buried pipelines [1−3]. Although faults in seismically active areas should be avoided if
possible, it is inevitable that some infrastructure will cross such areas [4, 5]. Especially in recent years, in order to address problems of uneven areal distribution of water resources and inconvenient transportation in western mountainous areas, China has constructed many traffic tunnels, water tunnels, and energy-t
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