Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (6): 92-100.doi: 10.6040/j.issn.1672-3961.0.2020.277

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Analysis of pipe roof grouting reinforcement effect at tunnel entrance in loose stratum

YU Jun1, WENG Xianjie2, FAN Wensheng3, ZHANG Lianzhen4   

  1. 1. Jiangxi Province Traffic Construction Engineering Quality Supervision Administration, Nanchang 330008, Jiangxi, China;
    2. Jiangxi Traffic Consulting Company, Nanchang 330008, Jiangxi, China;
    3. Yichun Management Center, Jiangxi Provincial Expressway Investment Group Co., Ltd, Yichun 336000, Jiangxi, China;
    4. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, Shandong, China
  • Published:2020-12-15

Abstract: Based on Lianhua Tunnel in Pinglian Express Way, three-dimensional calculation model was established to study excavation stability considering pipe roof grouting reinforcement effect. Effect of different pipe roof grouting parameters on excavation stability was analyzed quantitatively, such as mechanical parameters of grouted body, pipe roof interval, grouting radius. In the end, numerical simulation results were used and verified in engineering project. Research results showed that there existed plastic failure zone at vault and region below tunnel face. Pipe roof grouting method had effect on limiting deformation of surrounding rock, reducing volume strain of surrounding rock and cutting off connection between plastic failure zone on vault and tunnel. In whole affected area of pipe roof grouting, maximum settlement of pipe roof settlement appeared around tunnel face. Maximum settlement of pipe roof settlement was negatively related with elastic modulus of grouted body and grouting radius, positively related with pipe roof interval. However, influence level of pipe roof interval was lower than elastic modulus of grouted body or grouting radius.

Key words: rock and soil mechanics, loose stratum, tunnel, pipe roof grouting, reinforcement effect

CLC Number: 

  • TU45
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