›› 2010, Vol. 31 ›› Issue (8): 2479-2483.

• Geotechnical Engineering • Previous Articles     Next Articles

Study of failure modes of soil surrounding rock in excavation

WANG Ming-nian1, CHEN Wei-tao2, ZHANG Lei1, TONG Jian-jun1   

  1. 1.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2.Hydrochina Chengdu Engineering Corporation, Chengdu, 610072, China
  • Received:2009-04-21 Online:2010-08-10 Published:2010-08-30

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Abstract:

Combining lots of the failure investigations of surrounding rock in soil tunnels and model test, the failure location and state of soil surrounding rock were researched. The failure modes of soil surrounding rock and their definition were discussed according to the failure location and state. The results show that the failure modes of soil surrounding rock include un-supported section failure mode, tunnel face failure mode, the failure mode which un-supported section and tunnel face destroying at the same time and no destroying failure mode. Un-supported section failure mode can be divided into self—stability failure, footage failure and no failure. The main control factors of self-stability are the span and high of tunnel and the condition of soil surrounding rock: but the condition of soil surrounding rock and footage are the primary control factors of footage failure.For tunnel face failure mode,the failure surface shape approximates to logarithmic spiral curve or inclined plane; for un-supported section failure mode, the failure surface shape is a parabolic curve;and intersecting curve of logarithmic spiral curve or inclined plane and parabolic curve for the failure mode which is un-supported section and tunnel face destroying at the same time.

Key words: soil surrounding rock, failure mode, un-supported section, tunnel face`

CLC Number: 

  • U 456
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