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MODERN TUNNELLING TECHNOLOGY 2019, Vol. 56 Issue (4) :62-68    DOI:
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Reflection on Disease Treatment and Design Issues of Unconventional Rockburst of Bamiao Tunnel on Taoyuan-Bazhong Highway
(Sichuan Provincial Transport Department Highway Planning, Survey Design and Research Institute, Chengdu 610041)
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Abstract The maximum buried-depth of Bamiao tunnel on Taoyuan-Bazhong highway is 312 m, the rock stratum is nearly of horizontal form and it presents as interbed of sand and mudstone. Unconventional rockburst events occurred during the tunnel construction, and a series of diseases were found at these sections after operation. The causes of the diseases were summarized by analyzing the phenomena and data as well as the results of special tunnel inspection. Based on the on-site geostress test results during construction, it was assumed that the seriously cracked secondary lining was in the critical state of failure, thus the load borne by the structure was deduced. The formula for calculating safety coefficient of concrete structure with additional lining was deduced, and the relationship between the safety coefficient of tunnel with additional lining and the thickness of additional lining was obtained.
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WANG Dengmao TENG Zhennan TIAN Zhiyu CHEN Zhixue
Keywords： Highway tunnel   Disease treatment   Unconventional rockburst   Reinforcement by additional lining   Safety Coefficient     
Abstract： The maximum buried-depth of Bamiao tunnel on Taoyuan-Bazhong highway is 312 m, the rock stratum is nearly of horizontal form and it presents as interbed of sand and mudstone. Unconventional rockburst events occurred during the tunnel construction, and a series of diseases were found at these sections after operation. The causes of the diseases were summarized by analyzing the phenomena and data as well as the results of special tunnel inspection. Based on the on-site geostress test results during construction, it was assumed that the seriously cracked secondary lining was in the critical state of failure, thus the load borne by the structure was deduced. The formula for calculating safety coefficient of concrete structure with additional lining was deduced, and the relationship between the safety coefficient of tunnel with additional lining and the thickness of additional lining was obtained.
Keywords： Highway tunnel,   Disease treatment,   Unconventional rockburst,   Reinforcement by additional lining,   Safety Coefficient     
Cite this article:   
WANG Dengmao TENG Zhennan TIAN Zhiyu CHEN Zhixue .Reflection on Disease Treatment and Design Issues of Unconventional Rockburst of Bamiao Tunnel on Taoyuan-Bazhong Highway[J]  MODERN TUNNELLING TECHNOLOGY, 2019,V56(4): 62-68
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