›› 2011, Vol. 32 ›› Issue (5): 1553-1560.

• Numerical Analysis • Previous Articles     Next Articles

Mechanism study of abrupt deformation of underground powerhouse induced by excavation unloading under high in-situ stress

LUO Yi1, 2, LU Wen-bo1, 2, ZHOU Chuang-bing1, 2, CHEN Ming1, 2, YAN Peng1, 2   

  1. 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan 430072, China
  • Received:2011-02-09 Online:2011-05-10 Published:2011-09-23

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Abstract: The mechanism of abrupt large deformation in the sidewall of underground powerhouse is analyzed. The surrounding rock mass dynamic loosening is concerned as a main cause of abrupt deformation in underground powerhouse. Based on the monitored data at Pubugou hydropower station, numerical analysis is conducted with finite element method; and horizontal displacements induced by excavation load quasi-static and dynamic unloading are calculated respectively. The result itself and comparison to monitored data show that sliding and opening on structural surfaces induced by excavation load dynamic unloading are the major causes of abrupt large deformation in underground powerhouse, but which is not so obvious under quasi-static unloading. In actual projects, the transient effect of in-situ stress unloading should be considered; and the disturbance in the surrounding rock mass during each operation should be minimized to avoid potential abrupt large deformation, or even instability

Key words: underground powerhouse, in-situ stress, dynamic unloading, abrupt deformation, rock mass excavation

CLC Number: 

  • TU 354
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