Analysis and Comparison of Treatment Plans About Landslide of Highway Tunnel Entrance
Taking the landslide at the entrance of the Shujiayan Tunnel of Tongzi-Xinpu expressway as the engineering background,the cause of the landslide was analyzed first,and then the landslide stability evaluation and treatment scheme screening were carried out.In order to obtain more accurate calculation parameters,refer to the Design Specification for Highway Landslide Prevention and Control,based on monitoring data and drilling verification,it was determined that the upper slope of the first sliding surface was in the creep stage,and the stability coefficient Fs was taken as 0.98.The second sliding surface shown no obvious signs of sliding,and the stability coefficient Fs=1.05.Through soil test and back analysis,the mechanical parameters of the landslide were analyzed,and the surplus glide force of the landslide was calculated as 1 449.10 kN/m.The anti-slip measures were urgently needed for the slope.Finally,aiming to improve the safety of tunnel construction after landslide treatment,based on the development of the landslide,a scheme of anti-slide pile and back pressure was developed,and a comparison of the scheme was made.Considering the low engineering cost of the anti-slip pile scheme,it was beneficial for the stability of the mountain during operation and had a small impact on the environment.The backfilling and backpressure scheme had high engineering costs,which could induce the occurrence of secondary landslides.The anti-slip pile scheme was chosen and achieved good governance results.
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