Abstract: The mechanical properties of rock and soil are relatively complicated, and it is necessary to study the analytical methods of soil pressures in shielded tunnels in this environment. Based on a section project of Taizhou Metro Line No. S1, the soil and water pressures during the entire process from tunnel excavation to soil stability were monitored throughout the in-situ tests. The magnitude and variation patterns of soil and water pressure values were analyzed. Results show that, due to the influence of grouting and temporary construction loads, the soil pressure changes significantly in the early stages of construction, showing a trend of first decreasing, then increasing, and then decreasing. The soil pressure of the two monitoring sections initially entered a stable period on the 5th day, and there was no significant fluctuation in soil pressure after 110-160 days. In the early stage of pipe construction, the water pressure rapidly increases and reaches its peak after one day. Subsequently, the water pressure gradually decreases and tends to stabilize. The change in soil pressure at different positions of the pipe segment is significantly greater than the change in water pressure. The results provide a reference basis for the design of shielded tunnels in similar rock environments, which helps to improve the quality of engineering construction.

Key words: Shielded Tunnel in Rock Mass, Water Pressure, Earth Pressure, Field Measurement