（上海绿地集团江西申江置业有限公司， 南昌 330000）

［摘要］南昌绿地朝阳中心2#地块位于南昌市西湖区，工程基坑面积约25 000m2，挖深约6m。工程临近赣江，地下水问题复杂，同时开挖范围内存在深厚的软弱土层，给基坑工程的设计与施工带来了一系列技术难题。工程采用了以CSM工法构建的等厚度水泥土搅拌墙新工艺，采用了以“中心岛”为主、内支撑为辅的支护设计方案，成功实现了临江超大面积深基坑的设计，在保护了周边环境的基础上，节省了基坑工程造价和工期，具有良好的经济效益和社会效益。

［关键词］复杂地层； 铣削深层搅拌技术； 等厚度水泥土搅拌墙； 中心岛； 超大面积

中图分类号：TU471+.15文献标识码：A文章编号：1002-848X(2019)10-0103-07

Design case and new technology application of super-large-area deep foundation pit engineering near a river with complex strata conditions

Yi Wendi, Wu Mingang, Zhong Yahong

（Shanghai Greenland Group Jiangxi Shenjiang Investment Company Limited， Nanchang 330000, China）

Abstract:Nanchang Greenland Chaoyang Center 2# project is located in Xihu District of Nanchang. The area of foundation pit is about 25 000 m2 and the depth of excavation is about 6 m. The project is close to Ganjiang River, and the groundwater problem is complex. At the same time, deep soft soil layers exist in the excavation area, which brings a series of technical problems to the design and construction of foundation pit engineering. This project adopted the new technology of equally thick cement-soil mixing wall constructed by CSM method, and the supporting design scheme used the “central island” as the main part and internal supports as the auxiliary part, to successfully realize the design of super-large-area deep foundation pit near a river. On the basis of protecting the surrounding environment, it saved the cost and time of foundation pit engineering, and had good economic and social benefits.

Keywords:complex strata; cutter soil mixing; equally thick cement-soil mixing wall; central island; super large area

作者简介：易文迪，硕士，工程师，Email:290621952@qq.com。