软土地区深大基坑支护方案优化三维数值模拟分析

以软土地区某内支撑体系深基坑为研究背景,实际工程对原方案的基坑分区进行了合并,并调整了支撑的水平和竖向布置。为了研究方案调整后的优化效果,运用数值模拟软件PLAXIS建立了原方案和优化方案模型,首先通过优化方案计算结果与工程实测结果的对比证明了数值模拟的有效性,然后对比了原方案和优化方案的模拟结果,对比结果表明：优化方案对坑外土体和围护结构变形的控制优于原方案,最后对比了两方案的造价和工期,结果表明优化方案造价更低,工期更短。因此,此次优化的效果明显。优化方法和得到的结论可为类似工程提供参考。

Three-dimensional Numerical Simulation Analysis of Optimization of Deep and Large Foundation Pit Support Scheme in soft clay area

Taking the deep foundation pit of an internal support system in soft soil area as the research background, The actual project merges the foundation pits of the original plan and adjusts the horizontal and vertical arrangement of the support. In order to study the optimized effect of the scheme adjustment, the original scheme and the optimization scheme model were established by using the numerical simulation software PLAXIS. Firstly, the validity of the numerical simulation was proved by comparing the calculation results of the optimization scheme with the engineering data, and then the original scheme and optimization scheme were compared. The results of the comparison show that the optimization scheme is better than the original scheme for the deformation of the soil outside the pit and the deformation of retaining structure. Finally, the cost and construction period of the two schemes are compared. The results show that the optimization scheme has lower cost and shorter construction period. Therefore, the effect of this optimization is obvious. The optimization method and the conclusions obtained can provide reference for similar projects.