Abstract: The bolt-shotcrete support is adopted to ensure the stability of wall rock by spraying the cement concrete and fixing the anchor rod. The design of the supporting parameters is the key figure on the stability of wall rock. Combining with Dahualing cave tunnel and the structural features of fault F1, and according to the fault crush belts' actual trend, occurrence and different included angle of the cave tunnel axis' in Dahualing tunnel, the rock-bolt supporting parameters and the thickness of cement concrete of the fault belt are designed by adopting the semi-empirical and semi-theoretical method. The effect of spraying anchor protection supporting of cave tunnel affected by the fault crush belts is numerically analyzed by using the software MIDAS/GTS. And the contrast analysis of sedimentation and the displacement of certain construction site are made before and after the support. After then, the structure condition and the engineering effect of the surrounding rock and support are discussed. The results show that the reasonable supporting parameters can effectively control the displacement of wall rock and protect its stability. This analysis method can be used as a reference for the design, construction and research of bolt support for similar tunnels.

Key words: Highway tunnel, Bolt-shotcrete support, Support effect, Numerical simulation