Analysis of the Influence of Shield Obliquely Crossing Construction on Pile Foundations Based on Numerical Inversion
Based on the Nanhai Garden Phase Ⅱ project of the Wanghai Road shield tunnel,the numerical analysis method was adopted to analyze the disturbance influence of shield construction on pile foundations.The analysis results and suggested construction measures are as follows:(1)The closer the shield construction is to the pile foundations,the greater the disturbance,with the pile foundations at positions 1#,2#,and 3#being most affected.(2)During the period from the beginning of shield excavation to the pile foundation,the deformation of pile foundations increases the most,and after the excavation distance exceeds 100 m,the displacement change amplitude of each pile tends to stabilize.(3)The maximum vertical displacement of the pile bottom is-3.25 mm,and the maximum horizontal displacement is 0.95 mm;the maximum vertical displacement of the pile top is-0.26 mm,and the maximum horizontal displacement is 0.26 mm,all of which appear in the 1#pile,and the pile top is disturbed by the shield.Less than the pile bottom,the deformation of the pile foundation meets the requirements of the specification,and the building on the top of the pile is within the controllable range affected by construction.(4)Adopt sleeve valve tubes for pre-injection grouting around the building,enhance the physical and me-chanical properties of the strata,improve deformation monitoring of the pile foundations,and strictly control and dynamically adjust the parameters of the shield excavation.
NETL
NSTL
万方数据
维普
