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MODERN TUNNELLING TECHNOLOGY 2012, Vol. 49 Issue (6) :70-74    DOI:
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Study of the Force Characteristics of the Primary Support in a Tunnel with Large Deformation and Related Countermeasures
Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, School of Civil Engineering, Southwest Jiaotong University
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Abstract Concrete cracking, spalling, and rock falls occurred at both tunnel haunch and feet in the Daliang tunnel of the Chongqing-Lichuan railway because of the large deformation effect of the surrounding rock. Considering the safety of the tunnel, site tests (a stress relief test and a loose circle test) and numerical simulations (trial and positive calculation) were performed in order to study the characteristics of the support structure and put forth corresponding countermeasures. The results showed that under this geological condition, the primary support structure will be destroyed when the amount of reinforcement is only 5.07cm2 in the Daliang tunnel, which does not meet the requirement and must be adjusted. The study also found that the scope of a loose circle is 2.29m, which coincides with the result obtained by the geological radar; this testifies to the feasibility and correctness of this method.
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GONG Lun
SUN Ke-Guo
CHOU Wen-Ge
Keywords：   
Abstract： Concrete cracking, spalling, and rock falls occurred at both tunnel haunch and feet in the Daliang tunnel of the Chongqing-Lichuan railway because of the large deformation effect of the surrounding rock. Considering the safety of the tunnel, site tests (a stress relief test and a loose circle test) and numerical simulations (trial and positive calculation) were performed in order to study the characteristics of the support structure and put forth corresponding countermeasures. The results showed that under this geological condition, the primary support structure will be destroyed when the amount of reinforcement is only 5.07cm2 in the Daliang tunnel, which does not meet the requirement and must be adjusted. The study also found that the scope of a loose circle is 2.29m, which coincides with the result obtained by the geological radar; this testifies to the feasibility and correctness of this method.
Keywords：   
published: 2012-03-19
Cite this article:   
GONG Lun, SUN Ke-Guo, CHOU Wen-Ge .Study of the Force Characteristics of the Primary Support in a Tunnel with Large Deformation and Related Countermeasures[J]  MODERN TUNNELLING TECHNOLOGY, 2012,V49(6): 70-74
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