Abstract:The surrounding rock stability of shallow buried tunnel with large section and small clear distance is poor, and the mutual disturbance between tunnels is frequent, which is very easy to cause disasters such as chamber collapse and surface collapse. Therefore, the stress state of tunnel surrounding rock and the stress characteristics of support are very important for tunnel stability control. Taking the tunnel under construction as the background, the construction response law of surrounding rock pressure and internal force of composite lining of shallow buried tunnel with large section and small clear distance is analyzed by using the method of field monitoring and numerical simulation. The results show that the former tunnel support can reduce the horizontal span of the soil arch of the tunnel with small clear distance by strengthening the surrounding rock, so as to improve the bearing capacity of the surrounding rock of the later tunnel. The construction of adjacent tunnels disturbs each other obviously, and the excavation of the core soil of the later tunnel has the most significant impact on the pressure release of the surrounding rock of the former tunnel. In addition, for the excavation of shallow buried large section and small clear distance tunnel, the double sides heading method can effectively control the surrounding rock deformation and pressure release, and the surrounding rock pressure and support stress construction response law based on the tunnel excavation method can provide reference for the optimization of construction scheme.