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### 深基坑开挖与土钉支护三维数值分析

1. 1.中交第三航务工程勘察设计院有限公司，上海 　200032
2.苏州市城市建筑设计院有限责任公司，江苏 　苏州 　215000
3.上海交通大学土木工程系，上海 　200240
• 收稿日期:2010-04-01 出版日期:2011-04-01 发布日期:2011-04-29
• 作者简介:丁勇春（1979-)，男，江苏省大丰市人，博士，工程师，主要从事基坑工程数值计算方面的研究．|王建华（联系人），男，教授，博士生导师，电话（Tel.): 021-62932915; E-mail: wjh417@sjtu.edu.cn.
• 基金资助:
国家自然科学基金资助项目(50679041);上海市科学技术委员会资助项目(08201200903)

### Three-Dimensional Numerical Analysis of Soil Nailing for Deep Excavation

DING Yong-chun1, ZHOU Shun-xin2, WANG Jian-hua3()

1. 1.CCCC Third Harbor Consultants Co. , Ltd. , Shanghai 200032, China
2.Suzhou City Architecture Design Institute Co. , Ltd. , Suzhou 215000, China
3.Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China
• Received:2010-04-01 Online:2011-04-01 Published:2011-04-29

Abstract:

In order to investigate the deformation characteristics and load transfer mechanism of deep excavation, a numerical model considering the process of stepped excavating and soil nailing was established by FLAC 3D. The lateral displacement of excavation surface and outside soil, the shear strain increment of soil, and the axial force distribution of nail were analyzed. The results show that, the maximum lateral displacement appears close to slope toe, meanwhile, outside corner is the most disadvantageous location of deflection, and the multilevel platforms have positive effects on controlling soil deformation. Tensile failure and shear failure are the two main failure modes of excavation slope. The location of potential sliding surface can be indicated by shear strain increment contour, and the location moves toward the outside end of soil nail due to soil nail reinforcement effects. The maximum axial force of soil nail appears near the middle and the relative minimum value near the two ends, and the distribution of maximum axial force agrees well with the potential sliding surface.