Mechanism Analysis And Treatment Measures Of Large Deformation Of Surrounding Rock In Mountain Tunnel

Deep buried long tunnels play an important role in overcoming terrain obstacles such as mountains and canyons and improving the engineering quality of land transportation.With the continuous expansion of infrastructure construction in China,many deep buried mountain tunnels have been put into construction,and the geological conditions are becoming more and more complex.If the tunnel passes through the weak surrounding rock zone or the high ground stress area,it will often encounter large deformation of surrounding rock and other disasters.The tunnel investment is huge,the construction period is long,and it belongs to the key project in the whole construction period.It is of great significance to study and analyze the mechanism of large deformation of surrounding rock and related treatment measures.This paper takes the left cave project of Shishiyan Tunnel in the East Second Ring Road of Anxi County as the research object,and studies the large deformation mechanism,disaster prediction and prevention of the mountain tunnel.The main research contents include:(1)Introduce the hydrological characteristics and geological features of the left cave project of Shishiyan Tunnel in the East Second Ring Road of Anxi County.(2)The characteristics and modes of large deformation of surrounding rock of mountain tunnel are discussed.The large deformation mechanism of Shishiyan tunnel is studied by surrounding rock lithology,stress expansion,artificial mining disturbance and rock mass structure control.On the basis of the domestic and foreign research scholars’ classification of large deformation,the classification scheme of large deformation of surrounding rock of Shishiyan tunnel is proposed.(3)Through the ANSYS numerical simulation and the results of surrounding rock support monitoring,it is considered that the slight deformation of the slight surrounding,it is considered that the slight deformation of the slight surrounding rock occurred in the excavation process of Shishiyan tunnel,through the timely application of the initial stiffness of the supporting structure.Support,its control effect is obvious.(4)According to the engineering geological characteristics of Shishiyan Tunnel,a large deformation disaster prediction scheme combining geological analysis prediction,advanced geological prediction and monitoring measurement prediction is formed,and the prediction and prediction of the large deformation is possible.During the construction process,the adjustment and reinforcement of the surrounding rock support parameters are provided to ensure the occurrence of large deformation disasters.According to the scene accident case,the treatment plan and the prevention of the late collapse after the large deformation of the surrounding rock of the mountain tunnel are analyzed.Coping methods,etc.Figure[25]table[15]reference[71].