关键词: 饱和软土, 静压沉桩, 电缆隧道, 水平位移, 群桩效应影响系数

Abstract: In the process of static piling, there will be a strong soil squeezing effect, which will cause disturbance and deformation of the soil around the pile and the adjacent underground cable tunnel. If the deformation is too large, it may destroy the waterproof structure of the tunnel, causing leakage and seriously affecting the normal use and safety of the tunnel. Based on the theory of cylindrical hole expansion and the method of foundation bed coefficient, the theoretical calculation method of stress and horizontal displacement of surrounding strata and adjacent existing cable tunnels under the action of static piling in saturated soft soil areas are firstly studied. Secondly, considering the effect of group pile, the theoretical calculation method of horizontal displacement of adjacent existing cable tunnels caused by a single row of group piles construction is deduced, and the range of influence coefficient of group pile effect is studied. Finally, the theoretical calculation and numerical simulation of practical engineering problems are carried out. The results show that the method proposed in this paper can effectively calculate the horizontal displacement of adjacent existing cable tunnels, and the results are in good agreement with the numerical simulation results. The research can provide a reference for the prediction and protection of the disturbance to cable tunnels in the construction of adjacent pile foundations.

Key words: saturated soft soil, static piling, cable tunnel, horizontal displacement, influence coefficient of group pile effect