Research on Surface Settlement Characteristics of Continuous Small Radius Shield Tunnels Based on Different Routes

This paper takes the continuous small radius curve tunnel around Wanghua Street Station of Shenyang Metro Line 4 as the background, aiming to explore the impact of different line types on surface settlement. By establishing three different shield construction finite element models of straight line, small radius curve and continuous small radius curve, the comparison and analysis of shield tunneling processes of various line types are carried out, and the basic rules of surface settlement caused by continuous small radius shield construction are summarized. The correctness of the conclusion is verified by using empirical formulas. The results show that the surface settlement caused by continuous small radius shield construction conforms to the Gaussian distribution law, and the maximum value of surface settlement is located at the starting end of shield tunneling, and the amplitude and range of soil disturbance caused also continue to increase. Under the same conditions, the surface settlement caused by continuous small radius shield construction increases by about 16.4% and 33.3% respectively compared with small radius shield construction and straight section shield construction.