›› 2011, Vol. 32 ›› Issue (5): 1452-1459.

• Geotechnical Engineering • Previous Articles     Next Articles

Evaluation method of general geostress based on spalling features of wall rock

JIANG Quan1, FENG Xia-ting1, XU Ding-ping1, ZHAO Yang1, JIANG Ya-li2, HUANG Ke2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. East China Investigation and Design Institute, CHECC, Hangzhou 310014, China
  • Received:2010-01-03 Online:2011-05-10 Published:2011-09-23

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Abstract: According to the viewpoint that the kind of brittle spalling of wall rock is the embodiment of in-situ rock stress, a new evaluation method of general geostress is put forward based on spalling features of wall rock. Firstly, the spatial relationship of three principal stresses is gained through the analysis of spalling features of wall rock from the aspect of spatial distribution and intensity relation. Then, the direction of maximum principal stress is counted according to the trend of spalling’s split veins. The values of three principal stresses are calculated also based on the stress threshold values of spalling and threshold values of crack initiation. The in-situ stress evaluation of right powerhouse region in Baihetan hydropower station is validated by the local measured in-situ rock stress results and contrastively numerical analysis of different directions of maximum principal stress, which prove that the method is reasonable and useful for understanding the break of wall rock and checking the measured in-situ rock stress results.

Key words: evaluation of geostress, spalling feature, split veins, break of wall rock, Baihetan hydropower station

CLC Number: 

  • U 451+.2
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