Stability Analysis Of Talus Slope At The Entrance Of Huangshanshao Tunnel Of Lixiang Railway

In recent years,there are more and more infrastructure construction projects in western China,while the western part of China is a mountainous area,poor geological phenomena are often encountered during the infrastructure construction,talus slope is one of them.At present,the stability analysis of talus slope is still an engineering technical problem,hence,there is a significant need to investigate the stability of talus slope.The entrance of the Huangshanshao Tunnel in Lixiang Railway passes under the talus slope.During the process of construction,cracks appeared on the trailing edge of the talus slope,and the surrounding rock of the tunnel also cracked.Due to the existence of the talus slope,it has a great impact on the construction as well as the later operation of the railway.Therefore,this paper takes the talus slope of the entrance section of Huangshanshao Tunnel of Lixiang Railway as the research object and analyzes the deformation law of talus slope by the way of inclination and crack monitoring.At the same time,the stability of the talus slope is analyzed and evaluated by combining the methods of limit equilibrium and numerical simulation.The following research results are stand out:(1)From the analysis of the inclination and crack monitoring results,it is easy to find out that the talus slope has large displacement and deformation during tunnel excavation and heavy rain,and the potential sliding surface is the contact surface of the rock mass and the underlying bedrock.(2)By using the transfer coefficient method and the Morgenstren-Price method,the stability coefficients of the talus under natural conditions and heavy rain conditions are 1.341&1.353 and 1.085&1.062 respectively,which are basically stable and stable;the stability coefficients under seismic conditions are 1.04 and 1.037,which are less stable.(3)By using FLAC3 D simulation technology,the stability coefficient of the talus slope under natural conditions and heavy rain conditions are 1.31 and 1.07 respectively,which are basically stable;the stability coefficient under earthquake conditions is 1.04,which is less stable.