›› 2008, Vol. 29 ›› Issue (6): 1691-1696.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Genesis mechanism and engineering characteristics analysis of G23 mylonitization and fractured belt in dam foundation of a hydropower station

MENG Guo-tao1, XU Wei-ya1, YANG Sheng-qi1, LIU Jin-tang2, YAN Xin-chun3   

  1. 1. Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China; 2. Kunming Hydroelectric Investigation, Design and Research Institute, China Hydropower Engineering Consulting Group Co., Kunming 650051, China; 3. Jinghong Hydropower Project Construction & Management Bureau, Yunnan 666100, China
  • Received:2006-08-18 Online:2008-06-10 Published:2013-07-15

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Abstract: The G23 mylonitization and fractured belt located in the dam-foundation of a hydropower station is a main engineering geological problem of the project. Its genesis mechanism has been analyzed based on the characteristics of the new tectonic movement and the tectonic system. With the X-ray diffraction and scanning micrograph analysis, the main mineral components and microstructures of either the fractured rock or the phyllonite are identified. With the conventional triaxial compression testes, the stress-strain characteristic of G23 belt rock is examined. In conjunction with site specific analyses, the pre-existing state of rock mass in G23 belt is expounded. At last, based on physico-mechanical properties, the mass rock’s engineering characteristics are estimated; the influences of the G23 belt are discussed; and the main problems which should be study further are put forward.

Key words: G23 mylonitization and fractured belt, fabric and structure, physico-mechanical properties, hydropower station

CLC Number: 

  • TV 223
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