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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 10    October 2020

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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

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 soft- and 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

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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