›› 2012, Vol. 33 ›› Issue (10): 2897-2902.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of collapse mechanism of underground caverns with unfavorable geological structures under seismic loading

WANG Shuai1, SHENG Qian1, ZHU Ze-qi1, XIAO Pei-wei2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Daduhe Hydropower Development Co., Ltd., Chengdu 610041, China
  • Received:2011-06-24 Online:2012-10-10 Published:2012-10-19

Abstract: Seismic response of rock is the main topic in current dynamic analysis of underground structures, but the dynamic response and collapse mechanisms of rock structures are lack of thorough study. Based on a practical hydropower project, three kinds of unfavorable geological structures are selected in the dynamic analysis of large underground caverns by using block theory. Then ground deformation history and characteristics of open and slip joints are studied under seismic loadings by a discrete element program UDEC. Simultaneously the movement mechanisms of the cutting blocks are also analyzed. The results show that steep dip geological structures have greater impact on earthquake response of underground caverns. Under the seismic loading, adverse geological structures slip along the steep incline joint with sudden. Collapse form of adverse geological structures may change with seismic load increasing.

Key words: underground caverns, unfavorable geologic structure, seismic loading, discrete element, joint, collapse form

CLC Number: 

  • U453.2
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