In-situ Monitoring and Analysis of Latan Tunnel Vertical Deformation Law

The vertical displacement of the tunnel vault of Alatan tunnel was selected as the research object. The field monitoring was conducted, and the finite element numerical model was established. Then the deformation law of the shallow buried tunnel surrounding rock was analyzed. The results show that the influence of stope face construction on the vertical displacement of vault surrounding rock are mainly concentrated within the scope of 0.5D (diameter excavation). The deformation becomes gradually stability at the distances from 1.8 times. The comparison results of the transverse measures points show that the surrounding rock loose circle extends to the surface, and the farther from the center line of the tunnel, the less disturbance intensity. The strata and surface variation law of numerical calculation are consistent with the field measured. The research can provide a reference for the similar tunnel engineering construction of process monitoring..