›› 2016, Vol. 37 ›› Issue (S2): 43-52.doi: 10.16285/j.rsm.2016.S2.005

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Influence of mechanical properties of sliding zone and water level changes on ancient landslide stability and its reinforcement measures

ZHANG Yu-cheng1, 2, 3, YANG Guang-hua1, 2, 3, ZHANG You-xiang4, ZHONG ZHi-hui5, HU Hai-ying6   

  1. 1. Guangdong Research Institute of Water Resources and Hydropower, Guangzhou, Guangdong 510610, China; 2. The Geotechnical Engineering Technology Center of Guangdong Province, Guangzhou, Guangdong 510610, China; 3. The Guangdong Emergency Technology Research Center of Mountain Torrents Disasters, Guangzhou, Guangdong 510610, China; 4. Beijing Geotechnical Institute Engineering Consultation Limited, Beijing 100038, China; 5. School of Civil and Architectural Engineering, Wuhan University, Wuhan, Hubei 430072, China; 6. College of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou, Guangdong 510642, China
  • Received:2016-06-12 Online:2016-11-11 Published:2018-06-09
  • Supported by:
    This work was supported by the National Natural Science Fund(51378131), Water Conservancy Science and Technology Innovation Fund of Guangdong Province(2009-25), Science and Technology Fund of Guangdong Provincial Highway Administration Bureau(2012-09), and Provincial Scientific Research Institutions Reform and Innovation Fund(2014B070706008).

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Abstract: Compared with the ordinary landslide, factors affecting the stability of the reservoir bank ancient landslide are much more. In addition to the regular factors, the stability is influenced by the water level change obviously. Moreover, the reservoir bank ancient landslide would become geological hazard easily, which causes great danger to human life and property. On the basis of an ancient landslide project of a reservoir, mechanical properties of sliding zone are investigated by the in-situ shear test, laboratory shear test and standard penetration test; and the regularity of influence of water level change on the ancient landslide stability is analyzed. The U-shaped changing regularity of safety factor of Egongdai landslide with water level is obtained. Methods presented in reference [12] are that landslide type can be identified by stress field, and then in high stress level sites reinforcement can be used to reduce stress level to increase safety factor. By the above methods, the upper region of Egongdai ancient landslide has thrust load-caused features; while the bottom region has retrogressive features. Therefore, the Egongdai landslide can be defined as combined landslide; and the upper and bottom regions should be reinforced. The influence on stress field of landslide by different reinforcement schemes are compared; and relationship between stress and displacement fields of the landslide and factor of safety of anti-sliding pile is studied. Results show that the optimal reinforcement site is the one of higher stress level and displacement. As for Egongdai landslide, the bottom region is also with high stress level. Considering the construction conditions and economy, an earth berm was finally constructed at the toe of Egongdai landslide 3 years ago. It is proved that determination of reinforcement site by stress level is reasonable. Research results can provide good reference to other similar projects.

Key words: old-landslide, variable modulus, strength reduction method, reservoir slopes, direct shear test

CLC Number: 

  • TU 411.7
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