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水泥土搅拌桩与钻孔灌注桩组合支护基坑研究应用
作者：敖小平张巍
来源：《中华建设科技》2014年第05期
【摘要】随着我国城市建设的发展，出现了大量基坑的开挖与支护的工程建设问题。在
软土地区，由于软土的强度不高、变形较大，且具有一定的蠕变性，基坑支护常常是施工中的难点。本文探讨了水泥土搅拌桩与双排灌注桩在软土基坑工程中组合使用的机理，其中着重分析了土拱效应。在此基础上，以上海某大型基坑工程为例，对其稳定性计算与基坑局部变形机理进行了研究。结合实际工程进行了一个大型基坑的设计计算与基坑局部变形的有限元模拟。本论文可为软土地区双排钻孔灌注桩与水泥土搅拌桩基坑组合支护供参考。
【关键词】基坑工程；水泥搅拌桩；钻孔灌注桩；双排桩；变形控制
The application and research on combined supporting of cement mixing pile with drilling bored pile
Ao Xiao-ping1、2,Zhang Wei2
(1.Jiangxi Geological Engineering (Group) Company Nanchang Jiangxi 330000；
2.Nanjing University, School of Earth Sciences and Engineering Nanjing Jiangsu 210000)
【Abstract】With the development of urban construction in China，more and more problem of excavation and supporting of foundation has emerged. In the soft soil area, because of the limited strength, large deformation and a certain degree of creep, the foundation supporting is even more complicated.In the paper, the mechanisms of combined application of cement-soil mixing pile with double row bored pile in soft soil foundation, especially the soil arching effect were discussed. Based on this, a large foundation engineering in Shanghai was taken for instance, the stability of the foundation was calculated and mechanism of local deformation was studied by finite element analysis. Subsequently. The study could be referred to the design and construction of combined support of cement soil mixing pile and double row bore pile in soft soil area.
【Key words】Foundation;Engineering;Cement;Mixing pile;Bored pile;Double-row
pile;Deformation control.
1. 水泥土搅拌桩与双排钻孔灌注桩组合支护作用机理
基坑开挖后随着土体应力的改变及位移的产生，支护结构后土体产生主动土压力首先传递给水泥搅拌桩挡墙，然后再通过水泥土搅拌桩挡墙传递给排桩承受，双排桩在冠梁及连梁的作