Experimental investigations of fault reactivation induced by slope excavations in China

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• 作者：Haijun Zhao (1)
  Fengshan Ma (1)
  Jiamo Xu (1)
  Jie Guo (1)
  Guangxiang Yuan (2)
  
• 关键词：Slope excavation ; Fault reactivation ; Physical simulation ; Flexural toppling ; Mechanism
• 刊名：Bulletin of Engineering Geology and the Environment
• 出版年：2014
• 出版时间：August 2014
• 年：2014
• 卷：73
• 期：3
• 页码：891-901
• 全文大小：6,529 KB
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• 作者单位：Haijun Zhao (1)
  Fengshan Ma (1)
  Jiamo Xu (1)
  Jie Guo (1)
  Guangxiang Yuan (2)
  
  1. Key Laboratory of Engineering Geomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
  2. North China University of Water Resources and Electric Power, Zhengzhou, 450011, China
  
• ISSN：1435-9537

文摘

Fault reactivation is a common and important engineering geological phenomenon. However, the surface expressions and intensity of reactivated faults adjacent to open-pit mines can vary with the engineering geological conditions. In this study, several types of fault reactivation were identified and studied based on geological investigations conducted at an open-pit mine in China. Based on these studies, a comparatively simple physical simulation method was employed to analyze the causes of fault reactivation under self-weight stress conditions. For a steeply dipping fault which outcrops in the tensile zone of an excavated slope, the tensile stresses generated perpendicular to the fault surface usually result in normal fault-style movement, regardless of the orientation of the fault. For a steeply dipping fault which outcrops in the compressional zone of an excavated slope, an outward-dipping fault usually generates reverse fault-style movement, whereas an inward-dipping fault usually generates normal fault-style movement. For a low-angled and inward-dipping fault, reverse fault-style movement could be induced because of the self-weight body forces of the hanging wall slope. Flexural toppling failure of an excavated slope was simulated by a series of inward-dipping faults. The simulated scarp sizes and deflections of the reactivated faults increased along the excavated slope.