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| STRUCTURAL CHARACTERISTICS OF SOFT-ROCK SLIP ZONE AND EXPERIMENTAL STUDY OF ITS FORMATION MECHANISM IN BOJI MOUNTAIN LARGE-SCALE OLD LANDSLIDE |
| XIN Peng1，2，WU Shuren1，2，SHI Jusong1，2，WANG Tao1，2，SHI Ling1，2，HAN Jinliang1，2 |
(1. Key Laboratory of Neotectonic Movement and Geohazard，Ministry of Land and Resources，Beijing 100081，China；
2. Institute of Geomechanics，Chinese Academy of Geological Sciences，Beijing 100081，China) |
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Abstract The slip zone of large-scale landslide in the Loess Plateau has been identified as red clay rock of Upper Pleistocene. However，there are few studies about the structural characteristics and formation mechanism of the slip zone. Herein，the fabrics and structural characteristics of clay rocks are introduced based on drilling core analysis，surface survey，X-ray diffraction and scanning electron microscope. Meanwhile，stress-strain test，residual strength test and slip zone creep experiment are also implemented. The formation mechanism of interbedded shear zone in the large-scale landslides is therefore analyzed. The results indicate that the main slip zone consists of rich-developed approximately horizontal shear plane. Plastic deformation and shear deformation break out together with the changes of soil structures in the slip zone. As for the mode of motion，block sliding prevail. It is also found that clay rocks suffer more fissures after evolving into soil of slip zone. The average water absorption velocity reaches 2.7 g/h and the penetrability is promoted. Under such a condition，the water absorption velocity of the standard rock sample in unit period accounts for 1.5 times of original rocks；the specific activity is 0.83. It is better than original rocks in terms of specific surface area and activity. Furthermore，structural changes of original rocks are accompanied by strength attenuation. According to test results，the conhesion of peak strength for original clay rocks with water content of 19.1% is 613 kPa，and the internal friction angle is 26.7°. In Boji mountain，the conhesion and internal friction angle of residual strength of slip zone is 8.79 kPa and 17.2°，respectively；the conhesion and internal friction angle of long-term strength of slip zone is 57.4 kPa and 20.47°，respectively.
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Received: 08 October 2012
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CHEN Weizhong1*, LIU Xinyu1, 2, YANG Jianping1, WANG Wei1, 2, ZANG Zhonghai3, DING Hongyuan3, ZHANG Zheyuan3, WANG Xiaogang3, SHI Zhengrong1. Development of a large-scale 3D physical model test system for underground energy storage caverns and its model experimental study[J]. , 2026, 45(6): 1615-1628. |
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2013, Vol. 32 
