单室井筒式地下连续墙水平承载力试验与计算方法研究  

Experiment and analysis on horizontal bearing capacity of single-chamber closed diaphragm wall

作　　者：戴国亮[1] 龚维明[2] 周香琴[1] 刘云忠[1] 刘立基[1] 

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096

出　　处：《建筑结构学报》2012年第9期67-73,共7页Journal of Building Structures

基　　金：国家自然科学基金项目(50908048)

摘　　要：井筒式地下连续墙基础内部含有大面积的土芯,由于存在墙内土芯、墙体以及外部土体的相互作用,其水平承载特性复杂。采用水平静载荷试验,进行了3个不同截面尺寸单室井筒式地下连续墙模型试验。便于对比,同时进行了3个相应尺寸的单片墙模型试验。基于墙身内力及位移测试结果,研究了单室井筒式地下连续墙基础的水平承载特性,分析了水平荷载-位移特性、土压力-位移的分布规律,结果表明:单室井筒式地下连续墙基础呈整体倾斜破坏特性,前墙外侧土压力对承载力贡献最大。结合模型试验特征,分别采用4种弹簧的弹性基础分析法和8种弹簧的刚性基础分析法计算单片墙与单室井筒式地下连续墙,与试验结果吻合较好,分析方法可为设计提供参考。For large soil cores inside the closed diaphragm wall, there are complicated interactions among soil core, walls and external soil in closed diaphragm wall foundation. Based on lateral static tests on three single-chamber model wails with different sizes, the bearing characteristic of closed diaphragm wall foundation as well as single traditional diaphragm wall were investigated. On the basis of the results about internal forces and displacement of the diaphragm walls, the paper presented the mechanism of the bearing capacity under the lateral load, the load-displacement characteristics of the wall, and the relationship between soil resistance and displacement. The results show the overall tilting failure characteristic of the wall under the lateral loading. The soil resistance outside the front wall is the main contribution on the bearing capacity. Combined with the failure characteristic, eight-spring rigid method was adopted to analyze the single-chamber model wall and four-spring elastic method was used to analyze the traditional diaphragm wall. The calculated results agree well with the experimental results, which can be a reference to the design of the closed diaphragm wall.

关 键 词：单室井筒式地下连续墙 模型试验 水平承载特性 分析方法 

分 类 号：TU476.3[建筑科学—结构工程] TU317.1[建筑科学—土工工程]