The Monitoring Technology of Shallow Buried Tunnel Construction

The deformation of surrounding rock of shallow buried tunnel construction is complex,the vertical displacement of the tunnel vault is selected as the research object to analyze the monitoring method of vertical displacement of surrounding rock of shallow buried tunnel section,the field monitoring is conducted in Alatan tunnel,and the finite element numerical model is established,and the shallow buried tunnel surrounding rock deformation law is analyzed.The results show that within the scope of 0.6 times the hole diameter excavation had a greater influence on the vertical displacement of vault surrounding rock,it is up to 61%-67% of total displacement;Compared with 75 m within the scope of the vertical displacement,the vertical displacement is almost zero at the distances from 1.2 times the center of the tunnel hole diameter,the surrounding rock loose circle extends to the surface,the farther from the center line of the tunnel,the less disturbance intensity.The strata and surface variation law of numerical calculation are basicly consistent with the field measured.