›› 2010, Vol. 31 ›› Issue (3): 870-874.

• Geotechnical Engineering • Previous Articles     Next Articles

Anchoring mechanism and effect of systematic rockbolt for shallow buried loess tunnel

GUO Jun1，WANG Ming-nian1，TAN Zhong-sheng2，LUO Lu-sen1   

  1. 1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044, China
  • Received:2008-11-17 Online:2010-03-10 Published:2010-03-31

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Abstract:

New-built railway passenger dedicated line from Zhengzhou to Xi’an passes through many districts mostly covered with loess. It’s the first time for China to build such large cross-section tunnel groups in loess zone, which have an area of more than 170 m2 and a span of more than 15.1m. Design theory and relative experience about this type of tunnel in the loess zone is insufficient, especially the anchoring effect and mechanism of systematic rockbolt is unknown. That is a key problem for the large span loess tunnel design. To analyze the effect of systematic rockbolt in the loess tunnel, a formula to explain systematic rockbolt anchoring mechanism is deduced; and the key cause of rockbolt loading in loess tunnel is pointed out. A theoretical model is used to study rockbolt loading; and the calculated results are in good agreement with practical measured data; it is indicated that the theoretical model proposed can give right loading of rockbolt. These results show that in the shallow buried loess tunnel, anchoring effect of systematic rockbolt near the arch is very weak, but systematic rockbolt near the sidewall works well.

Key words: shallow buried, large cross-section, loess tunnel, systematic rockbolt, anchoring mechanism

CLC Number: 

  • U 451
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