Research on calculating method for loose load of deep-buried large cross-section road tunnel has been done through numerical simulation and theoretical analysis method. Evolution rule of Slumping arch in deep-buried large cross-section road tunnel excavation by steps is analyzed by numerical method with the strain-softening model. The result indicates that excavations of large cross-section tunnel by steps can effectively control the slumping arch expansion，slumping arch of tunnel is the accumulation of that of headings，and traditional method can be used for calculating the loose load of heading in the process of the excavation，but not for that of large cross-section tunnel. So，the calculating method for loose load of deep-buried large cross-section tunnel in the process of excavation by steps is introduced and put into use. It is based on the state design method，carried out with the means of dynamic design，and fully embodies the role of temporary support. By compared with the measured data of Malin tunnel，it indicates that high accuracy can be reached with the method applied to calculate the loose load of deep-buried large cross-section road tunnel. These research results can provide design basis for supporting parameters determination of the similar tunnel.
万 飞，许崇帮，王华牢. 深埋大断面公路隧道松散荷载计算方法研究[J]. 岩石力学与工程学报, 2017, 36(S1): 3423-3430.
WAN Fei，XU Chongbang，WANG Hualao. Study on calculating method for loosening load of deep-buried large cross-section road tunnel. , 2017, 36(S1): 3423-3430.
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2017, Vol. 36 
