›› 2011, Vol. 32 ›› Issue (1): 15-20.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Field test research on elimination of systematic rock bolts in weak rock tunnel

CHEN Jian-xun1，YANG Shan-sheng2，LUO Yan-bin1，WANG Meng-shu3   

  1. 1. Key Laboratory for Bridge and Tunnel of Shaanxi Province, Chang’an University, Xi’an 710064, China; 2. Shaanxi Xiyan Railway Co. Ltd., Xi’an 710054, China; 3. School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044, China
  • Received:2009-11-15 Online:2011-01-10 Published:2011-01-19

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Abstract:

In weak rock tunnel, elimination of systematic rock bolts is advanced, and the primary support structure is the combination of steel arch, shotcrete, reinforcing mesh, feet-lock rock bolt and longitudinal link steel bar. This paper is based on Baojiashan tunnel. Two test sections are chosen and field test is carried out. With systematic rock bolts replaced by feet-lock rock bolts, two models of systematic rock bolts and non-systematic rock bolts are established and analyzed comparatively. The content of comparative tests includes: the clearance convergence of tunnel primary support, surrounding rock pressure, steel arch stress, shotcrete stress, axial force of rock bolt and longitudinal link steel bar stress. The result shows that the deformation of primary support in the two test sections tends stable and the structure is safe, which shows that the elimination of systematic rock bolts does not affect the security and stability of primary support; some rock bolts in the arch part are subjected to tension; and some are subjected to compression; but the force is minor, and the maximum tensile stress is only 11.8% of ultimate strength of steel, so the support action of rock bolts in the arch part is not obvious; most feet-lock rock bolts are subjected to tension, and the maximum tensile stress is up to 191 MPa, so the feet-lock rock bolts play an important role in the support system. The elimination of systematic rock bolts will reduce construction process, lower engineering cost and shorten procedure cycle time, which is conductive to an early closure of surrounding rock to form a complete supporting structure. It will get a significant economic value and social benefits.

Key words: tunnel engineering, weak surrounding rock, systematic rock bolts, feet-lock rock bolt, field test

CLC Number: 

  • U 451
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