驸马长江大桥北锚碇基坑开挖施工过程三维数值模拟分析

Three Dimensional Numerical Simulation Analysis of Excavation Process of Yangtze River Bridge's North Anchor Foundation

根据重庆万州驸马长江大桥北岸重力锚基坑的工程地质条件和设计施工方案,采用考虑开挖卸荷效应的有限差分软件FLAC3D对基坑开挖施工过程进行三维弹塑性数值模拟,分析了不同开挖工况下基坑边坡和支护结构的应力场、变形场以及塑性区分布等特征。通过数值计算结果对施工设计中所采用的设计条件、设计参数等进行分析验证,评价设计参数的合理性,最终对重力锚基坑边坡岩土体变形和基坑整体稳定性做出评价。

According to the engineering geological conditions of Yangtze Bridge and gravity anchor foundation excavation design and construction scheme,the excavation unloading effect of the finite difference software FLAC3 Don the foundation excavation process of three-dimensional elastoplastic numerical simulation,analysis of different excavation conditions of foundation excavation supporting structure and stress field,the deformation field and plastic zone distribution. Through the numerical calculation results,the design conditions and design parameters used in the construction design are analyzed and verified,and the rationality of the design parameters is evaluated. Finally,the geotechnical deformation of the gravity anchor foundation slope and the overall stability of the foundation excavation are evaluated.