某楼宇基坑工程方案优化分析

基坑工程的设计重在基坑支护系统的选型及优化．本文旨在通过介绍苏州某楼宇基坑工程的支护设计，阐述基坑工程方案的优化思路．基坑支护系统是个空间体系，本文采用挡土止水系统和支撑系统分开考虑优化的方法．挡土止水系统采用m法杆系有限元程序计算，并将计算的沿围护边的支撑力作用于支撑系统，来优化设计支撑系统的内力和位移．该方法简单实用，经过优化比较，优化后的方案不仅安全可靠(内力、位移合理)，而且为该工程节省造价约20％．本文表明，基坑工程方案的优化是个系统工程，要从地质条件、周边环境及工程规模综合考虑，才能取得较好的成果．

Project optimization of the foundation pit of a building

The design of foundation pit engineering focuses on the selection and optimization of retaining and bracing system.This paper indicates the optimization of foundation pit engineering by introducing the retaining and bracing system design of the foundation pit of a building in Suzhou.The retaining and waterproof system and bracing system are calculated respectively.The retaining and waterproof system is calculated with pole finite element method.The result of bracing internal force along circumstance is applied to optimize bracing system. This method is simple and practical.After optimization,optimized project not only is safe with reasonable internal force and displacement,but also decreases expense by twenty percent.This paper shows that foundation pit engineering is a system engineering and can only obtain satisfactory results according to geotechnical conditions,circumstances and project scale.