地连墙变形影响因素分析及支撑设计研究.pdfVIP

Vol. 32 No.2 第32 卷第2 期 河北工程大学学报(自然科学版) 2015 年06 月 Journal of Hebei University of Engineering (Natural Science Edition) Jun.2015 文章编号:1673 -9469(2015)02-∞14 -05 doi: lO. 3969/j. issn. 1673 - 9469.2015.02. ∞4 地连墙变形影响因素分析及支撑设计研究 袁爱平1 气孙兴凯2 ，张涛2 (1.北京科技大学土木与环境工程学院，北京 100083 ;2. 北京市保障性住房建设投资中心，北京 100040) 摘要:结合工程实例，利用有限元，分析软件 PLAXIS 模拟地下连续墙设计参数，探讨不同设计对 地连墙变形影响大小及差异，并根据分析结果对支撑设计方法进行优化。结果表明:适当增加 墙体刚度，可以有效减小地连墙倒移;如满足地连墙最小入土深度，再增加入土深度意义不大; 用混凝土支撑替换钢支撑、增加支撑刚度、减小支撑水平间距以及必要时在竖直方向上增加一 道支撑对;或小墙体变形具有较好的作用;同时对基坑周围软弱土体及结构薄弱区域进行土体加 固对控制基坑变形效果明显。 关键词:地铁深基坑;变形;有限元，分析;支撑设计;PLAXIS 中图分类号:U23 1. 3 文献标识码:A Influence factor of underground continuous wall degeneration and its support design research 1 2 2 YUAN Ai - ping • 2 ,SUN Xing - kai , ZHANG Ta0 (1 Civil and Environmental E鸣ineeriong School ,University of Science and Technology Beiji吨， Beiji吨， 10∞83 ; 2 Beijing City Affordahle Housing Construction Investment Center , Beijing , 100040) Abstract: ßased on the engineering example of Nanjing city gate of Wuding subway foundation pit , the paper uses the finite element analysis software PLAXIS to simuIate the design parameters of under- ground continuous wall. The influences of 由e different factors on underground continuous wall were discussed. The support design me出od was optimized by according to the comparison results. The re- sults show that increasing the stiffness of diaphragm wall can effectively reduce the lateral displace- ment of underground continuous wall; if the depth of underground continuou