›› 2009, Vol. 30 ›› Issue (S2): 452-456.

• Geotechnical Engineering • Previous Articles     Next Articles

Research on unloading relaxation criterion of high rocky slope excavation and its engineering application

FENG Xue-min1, CHEN Sheng-hong2, LI Wen-gang1   

  1. 1.Chengdu Hydroelectric Investigation & Design Institute, CHECC, Chengdu 610072, China; 2.School of Water Resources and Hydropower Wuhan University, Wuhan 430072, China
  • Received:2009-08-18 Online:2009-08-10 Published:2011-06-21

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Abstract: The research advance and existent insufficiency of unloading relaxation in rocky slope excavation are summarized. Based on the qualitative analysis of unloading relaxation process and mechanism, the limit tensile strain of rock is proposed as the criterion of unloading relaxation. The value taking principle of limit tensile strain of rock is put forward by analyzing the relationship between lab test value of limit tensile strain of rock and its tensile strength, and by referring to the successful practice of excavation unloading relaxation analysis in Xiaowan arch dam. The calculation method of tensile strain in rocky slope after excavation is deduced. By adopting three-dimensional elasto-viscoplastic finite element method of reinforced jointed rock masses, this unloading relaxation criterion and corresponding calculation methods are applied to the numerical analysis of rocky slope excavation unloading relaxation in Jinping First-Cascade arch dam foundation plane. By comparing to the disclosed situation after actual excavation and the sonic wave testing data, the results of numerical analysis are confirmed reasonable, so as to provide beneficial guidance to the construction of project.

Key words: high rocky slope, unloading relaxation of excavation, criterion, limit tensile strain, Jinping First-Cascade arch dam foundation plane

CLC Number: 

  • TU 452
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