The tunnel-slope engineering system is a very complex system.In the complex geological environment,the interaction of tunnel-slope engineering system involves not only the safety of highway construction and operation,but also the safety of life and property of residents above the slope.Aiming at the Abicun tunnel-Baizhucun mountain slope engineering system,the article studies the deformation characteristics and formation mechanism of Baizhucun large-scale mountain through geological survey,comprehensive monitoring of surface and deep displacement,numerical simulation and other technical means.The results show that:①The deformation scale of Baizhucun mountain is huge,which is manifested as the deformation of the mountain from the tunnel entrance to the footage of 1 300 m to the northwest side.The deformation range is about 540 m long and 450 m wide.The average depth of the mountain deformation is about 130 m,and the total volume is about 1 100 ×104 m3.The mountain deformation is the result of the interaction of the tunnel-slope engineering system.② The formation mechanism of mountain deformation can be summarized as four stages:vibration cracking-mud bursting-middle traction-forward pushing ③ The deformation rate of the mountain is different in space.The displacement rate of the middle and rear part of the mountain is obviously larger than that of the front part,which is related to the tunnel construction in time.
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