Research on calculation method of digging length in tunnel with underground excavation under shallow cover |
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| Authors: | WANG Zhi-da GONG Xiao-nan CAI Zhi-jun |
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| Institution: | 1. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310027, China; 2. Project Management Division Under Jinduicheng Molybdenum Group Co. Ltd., Hua County 714100, China |
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| Abstract: | In the process of construction of the tunnel underground cutting with shallow overburden，it is crucial to rationally delimit the size of digging length. If the size of digging length is too small, the construction time will be prolonged and temporary protection will increase. If the size is too large, the earth on the top of the tunnel will be unstable, it will even collapse. Based on equilibrium arch theory and Terzaghi’s loose medium theory, this paper proposes the calculating formula of digging length and analyzes loose medium in a construction project. |
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| Keywords: | underground cutting with shallow overburden digging length equilibrium arch theory loose medium theory |
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