›› 2011, Vol. 32 ›› Issue (1): 269-275.

• Numerical Analysis • Previous Articles     Next Articles

Numerical simulation analysis of deformation effect on treatment structure of karst cave due to karst tunnel excavation

ZHOU Xue-ming1，LIU Hui2，PENG Chuan2，WU Xian3   

  1. 1. Hunan Changxiang Expressway Construction and Development Co. Ltd., Changsha 410200, China; 2. College of Civil and Architectural Engineering, Changsha University of Sciences and Technology, Changsha 410076, China; 3. Guangdong Qinglian Expressway Development Co. Ltd., Qingyuan, Guangdong 511500, China
  • Received:2009-09-11 Online:2011-01-10 Published:2011-01-19

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Abstract:

According to a big karst cave in highway tunnel engineering of Qing-Lian Expressway in Baixugong, a three-dimensional element software (ANSYS) was employed to simulate the interaction between tunnel excavation and treatment structure in Baixugong tunnel. Stability of treatment structure and surrounding rock during tunnel excavation is studied in order to analyze the mechanical characteristics of treatment structure and the displacement of surrounding rock during tunnel excavation. According to analysis of calculation results, the pre-support effect of treatment structure in karst tunnels is evaluated. Treatment mode using pile-pile cap-one-wall support wall-connection beam, is safe and reliable. In the process of tunnel excavation, the pile strain and support wall stress all increased largely during the advance of excavation face, then gradually stabilized; and the treatment structure bears a part of surrounding rock pressure, it plays a support action role in karst tunnel excavation. The results are in good agreement with the field test data, so as to offer for reference in design and construction of tunnels crossing a big karst cave.

Key words: karst tunnel, treatment structure, numerical simulation, karst cave

CLC Number: 

  • O 242.21
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