Disturbance Zone Control Method for a Large Diameter Bored Pile Construction Near an Operative Subway
The installation of bridge piles near existing subway tunnels is an inevitable result in the utilizing urban underground space.Quantifying the disturbance zone of the surrounding soil layers caused by the bridge pile installation is an important measure to ensure the safety of existing subway tunnels.Providing a safer and cost-effective construction process according to the corresponding soil disturbance has also the technical significance of related research.Therefore,by using the finite element software,the construction of a large-diameter and extra-long bored bridge pile near a subway tunnel in Fuzhou was numerically studied.From the theoretical and numerical analysis results,the three-stage evolution characteristics of the soil stratum dis-turbance propagation with the excavation depth were investigated and an"upper part"method was proposed.The rapid con-struction method for this extra-long and large diameter bored piles combined with the micro-disturbance penetration of perma-nent steel casing and the lower slurry retaining wall.The field measurement results of a large-diameter and extra-long bored bridge pile near the subway tunnel construction in Fuzhou show that the final deformation of the tunnel disturbance guided by this method is within the allowable safe value.The method is demonstrated to be economical and safe.
Pile and Tunnel EngineeringShielded TunnelingSoil DisturbanceCombined Technology
NETL
NSTL
万方数据
