考虑工程桩影响的软土深基坑抗隆起稳定性分析  

Analysis of Basal Heave Stability of Deep Excavations in Soft Clays Considering Impact of Foundation Piles

作　　者：胡康俊 丰土根[1,2] 张福海[1,2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学岩土工程研究所,南京210098

出　　处：《三峡大学学报（自然科学版）》2015年第3期52-57,共6页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金资助项目(51009054);教育部科学技术研究重点项目(109077);江苏省自然科学基金资助项目(BK2010513);中央高校基本科研业务费专项资金资助(编号2014B04914)

摘　　要：深基坑坑底工程桩的存在不可避免地会对深基坑开挖的性状产生一定的影响,考虑工程桩的存在对深基坑开挖变形和抗隆起稳定性的影响研究尚不多见.设置坑底有工程桩和无工程桩两种情况,采用强度折减有限元法对软土深基坑抗隆起稳定性进行对比研究,分析基坑宽度、坑底软土层厚度、地连墙插入深度和坑内工程桩对基坑变形和抗隆起稳定性的影响.结果表明,考虑工程桩时基坑抗隆起稳定性明显高于无桩时的情况,基坑宽度对抗隆起稳定性的影响并不明显,坑底软土层厚度、地连墙插入深度、桩间距和桩长都能在一定范围内对基坑变形和基坑抗隆起稳定性有较大影响,而超过一定范围后影响并不明显,因此需要合理选取工程参数.The existences of foundation piles inevitably have some impact on deep excavations.It is still rare to consider the impact of foundation piles on the deformation and basal heave stability of deep excavations.Based on considering foundation piles and no-considering foundation piles,the finite element method with shear strength reduction（SSRFEM）is used to evaluate the basal heave stability of deep excavations in soft clays.The influences of excavation width,thickness of soft clay below excavation,wall penetration depth and foundation piles below excavation base on basal heave stability of excavations are studied in detail.The results show that the existence of foundation piles can significantly improve the basal heave stability of excavations.The influence of excavation width on basal heave stability of excavations is not obvious.Thickness of soft clay below excavation,wall penetration depth,pile spacing and the length of pile have significant impact on lateral displacement and basal heave stability of excavations within a certain range;But the effect is not obvious over a certain range;so we need to select the engineering parameters reasonably.

关 键 词：基坑开挖 抗隆起稳定性 基桩 强度折减 

分 类 号：TU473.2[建筑科学—结构工程]