内植混凝土加劲桩的水泥土复合挡墙应用研究  

Application of Composite Retaining Wall of Cement Concrete and Stiffening Pile in Cement Soil

作　　者：黄亚宁 钟洪波 陈浩冲 

机构地区：[1]广州大学土木工程学院,广州510006 [2]广东华隧建设集团股份有限公司,广州510006 [3]上海城建市政工程(集团)有限公司,上海200000

出　　处：《东莞理工学院学报》2017年第5期62-68,共7页Journal of Dongguan University of Technology

摘　　要：内植混凝土加劲桩的水泥土复合挡墙是将混凝土加劲桩有序嵌入水泥土搅拌挡墙内的一种新式组合结构。以佛山顺德区某基坑支护工程为例,通过MIDAS/GTS建立该工程的三维有限元分析模型,对内植混凝土加劲桩的水泥土复合挡墙的受力机理进行了数值模拟,分别分析了水泥土挡墙截面宽度、嵌固深度和混凝土加劲桩截面尺寸、嵌固深度以及布置形式对基坑围护结构内力和变形的影响。结果表明:水泥土挡墙嵌固深度和截面宽度的增加可增强基坑的稳定性,但若其截面宽度太大,加劲桩结构抵抗侧面压力与弯矩的能力就不能充分发挥;增大混凝土加劲桩结构的嵌固深度、缩小桩距、增加截面宽度均可有效限制基坑水平位移的发展;水泥土挡墙加劲与否对限制基坑竖向变形的效果不佳。Composite retaining wall of cement concrete and stiffening pile in cement soil is a new composite structure with concrete stiffening piles embedded in cement soil mixing retaining wall. In this paper,a foundation pit supporting project in Shunde District of Foshan is taken as an example; the three-dimensional finite element analysis model of the project is established by MIDAS/GTS; the mechanical mechanism of the composite retaining wall of cement concrete and stiffening pile in cement soil is simulated; and the influences of section width,embedded depth of cement soil retaining wall,size of cross section of stiffening pile,embedded depth and layout form on the internal force and deformation of retaining structure are discussed respectively. The result shows： the increase of embedded depth and section width of cement soil retaining wall can improve the stability of foundation pit,but if the section width is too large,the ability of the stiffening pile structure to resist lateral pressure and bending moment can not be fully exploited; increasing the embedment depth,reducing the pile spacing and increasing the section width of the concrete stiffening pile structure can effectively limit the horizontal displacement of the foundation pit; whether the cement retaining wall is reinforced or not is not good for the effect of the vertical deformation of the foundation pit.

关 键 词：混凝土加劲桩 水泥土挡墙 截面尺寸 嵌固深度 

分 类 号：TU473[建筑科学—结构工程]