Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (9): 3559-3568.doi: 10.16285/j.rsm.2018.1251

• Geotechnical Engineering • Previous Articles     Next Articles

Engineering geological properties of interlayer staggered zones at Baihetan hydropower station

HAN Gang1, 2, ZHOU Hui2, 3, CHEN Jian-lin4, ZHANG Chuan-qing2, 3, GAO Yang2, 3, SONG Gui-hong1, HONG Wang-bing5   

  1. 1. College of Civil Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 3. University of Chinese Academy of Sciences, Beijing, 100049, China; 4. Power China Huadong Engineering Corporation limited, Hangzhou, Zhejiang 310014, China; 5. Zhejiang Huadong Construction Engineering Co., Ltd., Hangzhou, Zhejiang 310014, China
  • Received:2017-07-11 Online:2019-09-10 Published:2019-09-06
  • Supported by:
    This work was supported by the Key Projects of the Yalong River Joint Fund of the National Natural Science Foundation of China(U1865203) and the National Natural Science Foundation of China (NSFC) (51709257, 51427803).

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Abstract: Interlayer staggered zones at Baihetan hydropower station are characterized as loose structures, poor water-physical properties, weak mechanical properties and large spatial distribution. The weak structural surfaces in the surrounding rock of underground space determine the deformation and failure of the surrounding rock mass. Based on a large number of geological exploration and experimental results of interlayer staggered zones in the Baihetan project area, they are divided into joint zones, lining zones and muddy zones. The formation mechanisms, macrostructural and microstructural features, mineral compositions, water-destructible properties and shearing mechanical properties in the C2 and C4 zones are studied. It is concluded that the interlayer staggered zones are mainly tectonic genesis, and the differences in clay mineral content, microstructure and hydrologic properties are obvious in different sub-zones. The shear mechanics curves of the interlayer staggered zones presents an ideal elastic-plastic. In the end, we analyze the effect of geological characteristics of interlayer staggered zones on the engineering rock mass during construction. Three main failure modes block collapse, shear slip, and seepage failure in the surrounding rock mass of underground powerhouses and caverns are observed.

Key words: Baihetan hydropower station, interlayer staggered zones, macro and micro-structure, physical and mechanical properties, failure modes

CLC Number: 

  • O 319.56
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