WANG Zhi-da, GONG Xiao-nan, CAI Zhi-jun. Research on calculation method of digging length in tunnel with underground excavation under shallow cover[J]. 2007, 28(S1).
WANG Zhi-da, GONG Xiao-nan, CAI Zhi-jun. Research on calculation method of digging length in tunnel with underground excavation under shallow cover[J]. 2007, 28(S1).DOI:
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.