上海湖沼平原地区邻近建筑堆填土处理方案研究  

Research on treatment schemes for filling soil adjacent to buildings in limnological plain subsoil area of Shanghai

作　　者：孔令荣 魏建华 李想 KONG Ling-rong;WEI Jian-hua;LI Xiang(SGIDI Engineering Consulting(Group)Co.,Ltd.,Shanghai 200093,China;Shanghai Geotechnical Engineering Professional Technical Service Platform,Shanghai 200093,China)

机构地区：[1]上海勘察设计研究院(集团)股份有限公司,上海200093 [2]上海市岩土工程专业技术服务平台,上海200093

出　　处：《地基处理》2024年第S01期39-45,59,共8页Journal of Ground Improvement

摘　　要：目前关于受堆土影响的被动桩的研究,主要关注被动桩桩身变形和桩身内力的分析,较少关注如何采取措施减轻被动桩受堆土的影响。本文对上海湖沼平原地区某邻近建筑堆填土工程处理方案进行研究,从控制堆土差异沉降及对邻近建筑物被动桩影响的角度,采用二维平面应变有限元法,进行考虑长期固结效应的桩土相互作用计算分析,对比了不作特殊处理、边桩外挑方案、加大筏板外挑方案、单排桩方案和双排桩方案,研究了既定的填土高度下不同处理方案的堆土工后沉降、差异沉降情况以及工程桩的桩身附加弯矩、附加剪力、桩身侧向位移情况。研究发现:采用筏板外挑或单排桩方案,可以显著降低工程桩桩身附加弯矩及剪力值,但对邻近主体建筑区域堆土工后沉降减小效果不明显;采用双排桩方案,对控制邻近建筑物区域的路面沉降、差异沉降以及降低工程桩桩身附加弯矩值均有显著效果。At present,research on passive piles affected by filling soil mainly focuses on the analysis of pile deformation and internal forces,with less emphasis on measures to mitigate its impact on passive piles.From the perspective of controlling differential settlement of filling soil and influence on passive piles beneath adjacent buildings,this paper investigates the treatment schemes for filling soil project adjacent to a nearby building in limnological plain subsoil area of Shanghai.Two-dimensional plane strain finite element method was adopted considering the pile-soil interaction and the long-term consolidation effect.Different treatment schemes such as no special treatment,border pile overhanging scheme,enlarged raft overhanging scheme,single-row pile scheme and double-row pile scheme were selected to compare the additional bending moment,additional shear force and pile lateral displacement of the engineering pile under the given filling height.It is found that the additional bending moment and shear force of the pile can be significantly reduced by enlarged raft overhanging scheme or single-row pile scheme,but the reduction of filling-induced settlement near the building is not obvious.It is also found that the use of double-row pile scheme had significant effect on controlling road settlement and differential settlement in adjacent building areas,and reducing the additional bending moment of engineering piles.

关 键 词：软土 堆土荷载 被动桩 差异沉降 双排桩 对邻近桩的影响 

分 类 号：TU47[建筑科学—结构工程]