相邻深大基坑同步施工的相互影响研究

Inter-influences of synchronized excavation of closely constructed large-scale deep foundation pits

采用岩土工程专业软件,结合上海陆家嘴金融中心区(二期)"瑞明项目"深基坑工程,对两个相邻深大基坑的同步施工过程展开数值分析,重点分析施工全程中围护结构的内力与位移变化过程以及基坑开挖对周边环境的影响,并与监测结果进行了对比分析。研究结果表明,在两个相邻深大基坑之间设置宽度为两倍开挖深度的分隔带,能够有效地减小两个相邻的深大基坑同步施工的相互影响。研究结果为将来类似工程的设计和施工提供了理论基础和成功的实例。

In order to study the inter-influences of synchronized excavation of closely constructed largescale deep foundation pits, a numerical simulation was introduced combining with a study case of Ruiming project in Shanghai. The internal force and displacement of the retaining wall, excavation support structure and adjacent area around the pits were analyzed for each real excavation step. Furthermore, the result of the numerical study was compared with that of detection test data onsite. It concludes that in order to decrease the inter-influences of synchronized excavation of closely constructed deep foundations pits, the suggested width of the safety isolation zone between pits should be about 2 times of the excavation depth. This research result may serve as a theoretical support and construction example for similar excavation engineering projects.