2014, Volume 16, Issue 8
Strategic Study of CAE >> 2014, Volume 16, Issue 8
Study on support mechanical behaviour and scheme for shallow buried tunnel in weak wall rock with rich water
1. Research Institute of Highway Ministry of Transport，Beijing 100088，China；
2. School of Civil Engineering and Architecture，Beijing Jiaotong University，Beijing 100044，China；
3. China Railway 16th Bureau Group Co.，Ltd.，Beijing 100018，China
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Abstract
Shallow buried section under river valley of Guan Jiao tunnel has done a series of research on support mechanical behaviour and scheme for tunnel in weak wall rock with rich water. Pressure of surrounding rock, stress in the steel frames, axial force of rock bolts and water pressure on lining are obtained by monitoring in test section. The result indicates that primary support can't be effectively controlled, inrush of clay and water and collapse occour sometimes, and the present support scheme can't meet safe construction requirements. By a comprehensive analysis of monitoring data, adjustment to support scheme is made. In v class surrounding rock section, lead pipe-shed and small pipe is set in the range of 120 degree at arch part , grouting reinforcement with small pipe is conducted in wide joints of driving face. Five meters grouted rock bolts, I20 steel frames and double layer mesh at arch wall consists of the primary support. In vi class surrounding rock section, Zero degree lead pipe-shed set with pipe shed workroom in the range of 180 degree at arch part and 1m below and whole section advance level drilling grouting are the main measures of advance support 7.5m self-drilling bolt, I20 steel frames, steel temporary support and double waterproof board consists of the primary support. These research results can provide theoretical basis and underlying date for support scheme for Shallow buried tunnel under river valley, and have high referential value for design and construction decision-making of analogous project.
Keywords
Tunnel project ; Shallow buried under river valley ; Weak wall rock ; Support scheme ; Field monitoring
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