Influence of Existing Buildings on Construction of Earth Pressure Shield in Extremely Soft Rock Stratum

In this paper, based on the background of the earth pressure shield tunneling through the existing buildings in the extremely soft rock formation at a short distance, using the method of combining ABAQUS finite element numerical simulation and on-site monitoring, from the perspective of surface and building vertical displacement changes and their control, the impact of existing buildings on shield construction is studied. The actual measurement results show that the ground surface and buildings will show a trend of uplift first and then subsidence during the underpass of the shield. Among them, the surface and buildings will settle at a relatively large rate during the shield tail exit stage. Numerical simulation results show that the building changes the original stress field of the stratum, and the final settlement peak of the ground surface shifts and increases toward the direction of the building, and the width of the settlement trough is also increased in a smaller range. The research in this paper has a strong theoretical guiding significance for the earth pressure shield to penetrate the sensitive area of the formation. At the same time, in terms of engineering practice, a specific guidance plan for the use of construction parameter adjustment and reinforcement grouting for settlement control of the earth pressure shield is also proposed.