考虑围护结构变形和桩顶荷载的基坑旁侧桩基变形计算  

Calculation of deformation of piles adjacent to a pit considering deformations of enclosure structures and pile top load

作　　者：王哲[1] 郭丙来 魏纲 胡成宝 章丽莎 陈博[3] WANG Zhe;GUO Binglai;WEI Gang;HU Chengbao;ZHANG Lisha;CHEN Bo(Institute of Geotechnical Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Department ofCivil Engineering,Hangzhou City University,Hangzhou 310015,China;College of Information Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]浙江工业大学岩土工程研究所,浙江杭州310023 [2]浙大城市学院土木工程系,浙江杭州310015 [3]浙江工业大学信息工程学院,浙江杭州310023

出　　处：《浙江工业大学学报》2023年第5期481-488,共8页Journal of Zhejiang University of Technology

基　　金：浙江省基础公益研究计划项目(LGG21E080003);浙江省自然科学基金资助项目(LHZ19E090001)。

摘　　要：归纳了4种典型基坑围护结构变形模式下的基坑侧壁变形曲线计算方法,基于应力释放法,提出了一种考虑围护结构变形模式以及桩顶竖向荷载的邻近基坑单桩水平位移计算方法。分析了围护结构累计变形相同情况下,不同变形模式引起的邻近单桩水平位移规律,同时进行了2个案例验证与影响因素分析。研究结果表明:在基坑围护结构最大变形相同情况下,悬臂型变形模式引起的邻近单桩最大水平位移最大,其次是复合型,再次是内凸型,踢脚型则最小;桩体最大水平位移与基坑围护结构控制参数虽然呈正相关规律,但是随着与围护结构水平距离的增加而呈非线性递减;作用在桩体上的附加应力增大时,桩体水平位移曲线逐渐从“悬臂”形向“鱼腹”形发展。虽然桩顶荷载对桩体水平位移有一定的影响,但是影响较小。The computational methods of the deformation curves of the foundation pit side wall under four typical deformation modes of foundation pit retaining structures are summarized.Based on the stress release method,a method is proposed for calculating the horizontal displacement of a single pile adjacent to a foundation pit considering the deformation mode of the retaining structure and the vertical load on the pile top.The horizontal displacement law of adjacent single piles caused by different deformation modes under the same cumulative deformation of the retaining structure is analyzed.At the same time,two cases are verified and the influencing factors are analyzed.The research shows that for a maximum deformation of the foundation pit retaining structure,the maximum horizontal displacement of adjacent single piles caused by the cantilever deformation mode is the largest,followed by the composite type,the inner convex type,and the skirting type.There is a positive correlation between the maximum horizontal displacement of the pile and the control parameters of the foundation pit retaining structure,but it decreases nonlinearly with the increase of horizontal distance from the retaining structure.When the additional stress acting on the pile increases,the horizontal displacement curve of the pile gradually changes from the“cantilever”shape to the“fish belly”shape.The load on the top of the pile has a certain effect on the horizontal displacement of the pile,but the effect is small.

关 键 词：基坑围护结构 变形模式 单桩位移 弹性地基梁 有限差分法 

分 类 号：TU473[建筑科学—结构工程]