堆载预压对邻近桩基处理施工交叉影响的有限元分析  

Finite Element Analysis of Mutual Iinfluence of Preloading on Neighbouring Piles Construction

作　　者：周斌[1,2] 洪宝宁[1,2] 陈刚[1,2] 刘鑫[1,2] 毕枫桐 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学土木与交通学院,南京210098

出　　处：《河南科学》2015年第3期426-430,共5页Henan Science

基　　金：中央高校基本科研业务费专项资金资助(2014B04914)

摘　　要：为了研究多种地基处理交叉施工的影响,结合广佛肇高速公路的工程实例,利用有限元方法分析了堆载预压与桩基处理交叉施工的影响.分析结果表明:与桩基处理相比,交叉施工导致桩基的水平位移与竖向位移大大增加,且距离堆载坡脚越近的桩基,位移增加越明显,这必然引起桩基的偏移以及桩基的不均匀沉降;同时,桩基受到的弯矩明显增加,这对桩基的抗弯性能提出了更高的要求;此外,交叉施工还会导致桩土位移差大大增加,桩间土出现绕流,极大地降低桩基的承载力及稳定性.In order to study the mutual influence of various kinds of foundation treatment, combining Guangfozhao highway as a construction example, we analyzed the mutual influence of preloading and pile foundation treatment by finite element analysis. The analysis results show as follows. Compared with pile foundation treatment, the cross construction leads to the great increasing of horizontal displacement and vertical displacement of pile foundation. Moreover, the closer piles to the slope, more obvious the displacements increases. It inevitably causes the offset and uneven settlement of piles. Meanwhile, the bending moment of piles increases obviously, which puts forward higher requirement on the bending properties of piles. Besides, the cross construction cause great difference between piles and soil in displacement, and soil surrounding piles comes to flow. This greatly reduces the bearing capacity and the stability of pile foundation.

关 键 词：交叉施工 有限元 堆载预压 桩基处理 

分 类 号：TU473[建筑科学—结构工程]