桩侧压浆控制群桩基础沉降量研究  

Study on the Settlement Control of Pile Group Foundation by Using Pile Shaft Grouting

作　　者：邹力[1] 吴兴序[1] 马建林[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《中国铁道科学》2010年第1期16-20,共5页China Railway Science

基　　金：铁道部科技研究开发计划项目(2008G032-3)

摘　　要：以京沪高速铁路丹阳至昆山特大桥阳澄湖桥段为工程背景,通过现场试验,研究角桩桩侧注浆和边桩桩侧注浆对深厚软土层中群桩基础在正常使用状态下沉降量的控制。运用数值模拟方法,分析由桩侧压力注浆引起的桩-土体系中桩土界面参数和桩周土模量变化对群桩基础在设计荷载下沉降量的影响。研究结果表明:由于桩侧注浆的作用会使桩土界面参数变大和桩周土模量提高,从而对深厚软土层中正常使用状态下群桩基础的沉降可以起到明显的控制作用;边桩桩侧注浆的效果优于角桩桩侧注浆;桩侧注浆浆液在土中的扩散范围直接影响群桩基础的沉降量。Taking Yangcheng Lake segment of Danyang-Kunshan super large bridge of Beijing-Shanghai high-speed railway as the engineering background, we carried out field tests to study the control effect of the corner pile shaft grouting and side pile shaft grouting on the settlement volume of pile group foundation under normal service in thick soft clay. We also used the numerical simulation method to analyze the impact of the variations of two parameters, which were the parameter of the interface between pile and soil and the deformation modulus of the soil around pile in pile-soil system, caused by pile shaft grouting on the settlement of pile group foundation under design load. It can be concluded from the research that the side pile shaft grouting can increase the parameter of the interface between pile and soil, and the deformation modulus of soil around pile, thus has an evident effect on the control of the settlement volume of pile group foundation under normal service in the thick soft clay. The control effect of side pile shaft grouting is more obvious than corner pile shaft grouting. When carrying out pile shaft grouting, the spread range of the grout in the soil will directly affect the settlement of pile group foundation.

关 键 词：群桩基础 桩侧压浆 沉降 现场试验 数值模拟 

分 类 号：U443.15[建筑科学—桥梁与隧道工程] TU473.1[交通运输工程—道路与铁道工程]