杭州钱江新城金融地块不对称超深基坑支护设计研究

Design of supports for asymmetric extra-deep foundation pit of financial block project in Qianjiang CBD of Hangzhou

工程地处浙江省杭州市钱江新城内,与钱塘江相距不足百米,属高水位强渗透性地基。地上由4幢独立的高层塔楼及其裙房组成,分属4家银行金融单位,地面以下为整体地下室,其中华融和工行大楼下部为3层地下室,金融大厦和浙商银行大楼下部分别为4层和5层地下室。深基坑支护工程按整体基坑考虑,开挖深度17.0~24.0 m不等,核心筒部位最大挖深约28.5 m。详细介绍了基坑工程概况和特点、围护措施和设计方案、不同步施工条件下的开挖流程和拆撑与换撑措施、不对称开挖条件下的内力变形补充计算、深层地下承压水处理、基坑施工与现场监测等内容,可供类似工程设计参考。

The deep foundation pit is located in Qianjiang CBD of Hangzhou City and is less than 100 m away from the Qiantang River. It's well known as the high water level and strong permeability foundation. There are four dependent high-rise towers on the ground which belong to 4 bank finacial units respectively, and a large integral basement consists of three parts, three-story basement under the towers of Huarong and ICBC(Industrial and Commercial Bank of China Limited), four-story basement under the commercial tower and five-story basement under the tower of China Zhejiang Bank Co., Ltd. The excavation depth is in the range of 17.0~24.0 m, and the maximum depth is approximately 28.5m in the core tube. In addition, the overview and features, retaining schemes, excavation process under the conditions of asynchronic construction, measures of dismantling and replacing support, analysis of the internal force and deformation caused by asymmetric excavation, treatment of deep confined water and monitoring results are introduced.