考虑群桩相互作用的层状地基沉降研究  

Settlement of Pile Groups in Layered Soil Considering Interaction Coefficient

作　　者：刘芸[1,2] 李镜培[1,2] 钟光玉 

机构地区：[1]同济大学地下建筑与工程系,上海20092 [2]岩土及地下工程教育部重点实验室(同济大学),上海200092 [3]上海南汇建工建设(集团)有限公司,上海201399

出　　处：《结构工程师》2015年第3期135-139,共5页Structural Engineers

基　　金：国家自然科学基金项目(51178341);浦东新区科技发展基金创新资金项目(PKJ2013-C08)

摘　　要：针对群桩相互作用及沉降问题,根据剪切位移法以单桩位移积分方程为基础,导出了桩顶位移与轴力和桩底位移与轴力之间的关系。在此基础上,考虑土体的成层特性及群桩"遮帘效应"和"加筋效应",对两桩间相互作用系数的计算方法进行改进,建立了层状地基群桩沉降的计算公式。为验证本文计算方法的有效性,将理论计算值和实测结果进行了对比。结果表明:由于本文计算方法考虑了土体分层特性和群桩的"遮帘效应"和"加筋效应",其计算结果与实测值较为接近。According to the shear displacement method and base on the pile displacement integral equation, the relationship between the pile-top displacement and axial force, and the relationship between the pile-end displacement and axial force were derived for group piles interaction coefficients and settlement problems. On this basis, a method for calculating the interaction coefficient between two piles was presented by fully considering layered soil and the group pile effect. Subsequently, the formula for calculating the group pile settlement in layered ground was established. To validate the proposed method, the theoretical calculations and experimental results were compared in this paper. Results showed that the calculated results were in good agreement with the measurements.

关 键 词：剪切位移法 相互作用系数 层状地基 群桩沉降 

分 类 号：TU473.1[建筑科学—结构工程]