›› 2012, Vol. 33 ›› Issue (1): 268-272.

• Numerical Analysis • Previous Articles     Next Articles

Numerical simulation for appropriate lining time of tunnel considering rock mass rheological conditions

ZHOU Yong1, 2，LIU Jian-xin1，FANG Jian-qin3，LIU Qun-yi1   

  1. 1. School of Info-Physics Engineering, Central South University, Changsha 410083 China; 2. Department of Resources and Environment, Hunan University of Arts and Science, Changde, Hunan 415000 China ; 3. Guangdong Yunwu Highway Expressway Ltd., Yunfu, Guangdong 527300 China
  • Received:2010-05-19 Online:2012-01-10 Published:2012-01-17

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Abstract: The Niucheding tunnel in Guangzhou-Wuzhou Expressway is taken as the engineering background, the analytical and numerical calculation method for the second lining time of tunnel under the conditions of rock mass rheological characteristic are analyzed. The disciplines of the arch settlement obtained from the proposed method are compared with that from the monitoring data; then the numerical calculation model is founded to analyze the influence of stress releasing coefficient on the stability of surrounding rock mass of tunnel. The analysis results show that, the disciplines of the arch settlement obtained from the proposed method are the same with that from the monitoring data, which validates the correctness of the proposed method. The stress of surrounding rock mass is released gradually with the tunnel face moves on; and the releasing rate is slow in the III degree of rock mass, which shows obvious spatial effect. According to the numerical calculation results, if the stress releasing coefficient is larger or equal to 60%, the whole area of the disturbed zone is larger than the area the bolt can reinforce. Finally, the appropriate second lining time is obtained so as to give some guidance for the real practice.

Key words: tunnel, second lining time, rheology, monitoring, numerical calculation, stress releasing coefficient

CLC Number: 

  • TU 457
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