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以上海地区某超深基坑工程为背景,介绍了基坑围护设计中支撑后拆法的应用。对设计及施工中存在的难点进行了分析,并针对性的给出处理、解决方案。对比分析了数值模拟、理论计算结果与工程实测数据,结果较为接近,监测数据无超过报警值情况发生,基坑开挖对周边环境的影响满足规范要求。采用支撑后拆法的基坑围护设计在本基坑工程实践中取得了良好的实施效果,值得在同类工程设计、施工中借鉴和参考。
Taking an ultra deep foundation pit project in Shanghai as the background, the application of back support method in supporting design of foundation pit is introduced. The difficulties in the design and construction are analyzed, and targeted to deal with and solutions. Comparative analysis of numerical simulation, theoretical calculation results and engineering measured data, the results are closer, the monitoring data does not exceed the alarm value occurs, the impact of excavation on the surrounding environment to meet the regulatory requirements. The design of the foundation pit supporting with back-support method has achieved good effect in the engineering practice of the foundation pit, and is worthy of reference and reference in the similar project design and construction.