张建新1，周嘉宾2，吴东明3（1 天津城市建设学院，天津市软土特性与工程环境重点实验室，天津 300384；2 河南省交通科学技术研究院有限公司，郑州 450005；3 河南煤化集团鹤煤公司设计处，鹤壁 458000）

［摘要］基于天津站交通枢纽基坑工程2标段施工监测资料，对超深逆作基坑开挖过程中地下连续墙及墙后土体水平变形、竖向位移等进行了分析。由分析结果可知，逆作基坑地连墙水平变形随深度变化近似呈弓形分布，在坑口处有向坑外的变形；水平变形最大值出现在基坑开挖面以上约1/3深度处，与顺作法发生在基底开挖面附近有显著不同。墙后土体的水平变形与墙体变形趋势大致相同，但变形值要小。在竖直方向上，随开挖深度的增加，地连墙不断隆起，层板浇筑后隆起值变小，最终变形趋于稳定。通过对逆作基坑开挖的监测分析，得出了有别于顺作基坑围护结构变形的规律，体现了逆作法变形小、整体性强的特点。

［关键词］深基坑；逆作法；地下连续墙；变形；监测分析

中图分类号：TU753.1文献标识码：A文章编号：1002-848X(2012)04-0121-03

Analysis of retaining structure deformation in super-deep foundation pit by top-down construction method

Zhang Jianxin1，Zhou Jiabin2，Wu Dongming3(1 Tianjin Institute of Urban Construction, Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin 300384, China; 2 Henan Transportation Research Institute Co., Ltd., Zhengzhou 450005, China；3 Design Department, Hebi Coal Co., Henan Coal & Chemical Group, Hebi 458000, China)

Abstract:Based on the actual measurement data of foundation in Tianjin Transfer Junction Station, the horizontal deformation and vertical displacement of the diaphragm wall and the soil behind the wall were analyzed during the pit excavation by top-down construction method. Results indicate that the horizontal deformation of the wall is similar to “bow” shaped approximately, and deformation is developed out at the wall-top. The maximum of the horizontal deformation occurs at about one third depth of the pit away from the excavation surface, which is obviously different from at bottom of the excavation by normal construction method. The deformation of the soil behind the wall is similar to the wall, except that its value is lower. The diaphragm wall uplifts continuously with the excavation depth increasing. The uplift value becomes smaller and deformation gets stabilized after laminate board pouring. The different changing discipline between top-down construction and normal construction method concluded by monitoring analysis exemplifies the trait that the top-down construction causes slight displacement and has good integrity .

Keywords:deep foundation pit; top-down construction method; diaphragm wall; deformation; monitoring analysis

*天津市科技创新专项基金（07FD2DSF01200），天津高校双五科技计划项目（SW20080010）。

作者简介：张建新，博士，教授，Email：zh_jianxin@126.com。

参考文献

［1］ 徐至均, 赵锡宏. 逆作法设计与施工［M］. 北京:机械工业出版社,2002

［2］ 赵锡宏, 李蓓, 杨国祥，等. 大型超深基坑工程实践与理论［M］. 北京:人民交通出版社,2004：58-78

［3］ 徐至钧. 建筑深基坑支护的发展与逆作法的应用［J］. 岩土工程界,2001,4(10): 16-17［4］ 杨国祥，李侃，赵锡宏，等.大型超深基坑工程信息化施工与研究［J］. 岩土工程学报, 2003,25(4):483-487

［5］ 贾坚, 谢小林. 上海软土地区深大基坑卸荷变形机制［J］. 上海交通大学学报,2009,43(6):1005-1010 

［6］ 刘利民, 张建新. 深基坑开挖监测时测斜管不同埋设位置量测结果的比较［J］. 勘察科学技术,1995(6):37-39