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| Advances in application of block theory to stability analysis of rock mass surrounding caverns |
| ZHANG Qihua1,2, ZHANG Yu3, LI Liping2, LIU Hongliang2, SHI Genhua1,2
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1. Three Gorges Research Center for Geohazards of the Ministry of Education, China University of Geosciences, Wuhan 430074, Hubei, China;
2. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, Shandong, China;
3.Yangtze River Scientific Research Institute, Wuhan 430010, Hubei, China |
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Abstract When the depth of a cavern is shallow or the surrounding rock is hard, the stability problem of surrounding rock mass of cavern is often manifested as local block failure. Block theory is essentially a geometric topological method, and it is an ideal tool to analyze the stability of block formed by mutual intersection of fractures. The application and development of block theory in stability analysis of surrounding rock of caverns were discussed systematically. The main analysis techniques included: selection of the axis of cavern based on the movability and morphology of block, morphology analysis of maximum block and definition of support-required block, determination of size of non-localized block based on the extent of discontinuities, morphology analysis of localized blocks, analysis of block stability, and analysis of block support as well. The problems associated with these analysis techniques in application were also discussed.
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Published: 25 February 2021
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