【摘要】该文从分析莲花河畔景苑七号楼倾覆前后的周围应力分布及其工况变化来初步探讨大楼倾覆的机理。提出高堆土使大楼筏板底下土体的水平侧压力处于极限平衡状态，南侧地下车库基坑边坡水泥搅拌桩悬臂挡墙养护龄期未到，其强度远未达到设计要求致使基坑边坡受损坍塌打破上述极限状态的平衡，大楼筏板底下土体向坍塌的基坑涌移。水平位移的土体又使管桩产生负摩擦力，在管桩轴向荷载难以支承大楼巨大荷载时而发生压碎断裂，大楼南倾倒地。
【关键词】河畔景苑；高堆土；水平侧压力；极限平衡状态；管桩负摩擦力；桩碎楼倒
【Abstract】In the article, an analysis of the Lotus River Garden, Building 7 before and after the collapse of the surrounding conditions of stress distribution and changes in the preliminary study the mechanism of overturning the building. Proposed raft of high bulldozers led to the building under the soil level of lateral pressure in a limit equilibrium state, the south side of the underground garage foundation pit of cement mixing pile cantilever retaining wall of the Conservation age yet to come, its strength is far from the design requirements led to excavation slope break above the limit state of collapse damaged the balance of raft building under the soil to the collapse of the pit Chung shift. Horizontal displacement of the soil also caused a negative friction pile generated in the pipe axial load is difficult to occur in load bearing building a huge crush fracture of the building south dumping ground.
【Key words】River side view; High Slope; Level of lateral pressure; Limit equilibrium state; Pile negative friction; Pile floor, Broken down
        1. 工程概况莲花河畔景苑由上海梅都房地产开发有限公司投资兴建，上海众欣建筑有限公司承建。工程位于淀蒲河以南，莲花路以西，罗阳路以北。本工程由12幢地上13层商业住宅楼及地下车库等16个分项工程组成，总建筑面积85227m2。
        1.1大楼位置与基桩。大莲花河畔景苑七号楼紧临地下室车库北侧，临近淀蒲河，并与之平行呈NEE向展布，大楼平面尺寸长为46.40m，宽13.20m，建筑总面积6451m2，楼高43.90m，钢筋混凝土剪力墙结构，基础采用基桩+条形承台，埋深2.10m，桩长33m，桩数118根。
        1.2大楼场地地层。大楼地基场地土为软弱土，且位于古河道中，第3层和第4层为淤泥质土，埋深达3.50～13.00m，灰色，饱和，流塑状，其竖向承载力特征值仅50KPa，桩端持力层为第7层1～2小层粉质粘土。
        1.3大楼基础。大楼基础为双向条形承台，基础截面为600×700mm，与有效桩长33m的118根高强预应力混凝土管桩共同承托大楼建筑荷载。
        1.4大楼旁侧基坑支护方案。紧邻大楼南侧的地下

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