灌注桩单桩沉降计算的改进算法  

Modified algorithms for settlement calculation of single pile of cast-in-place piles

作　　者：魏继红[1] 张慧昕[2] 吴继敏[1] 彭森良[1] 杜金新[1] 冯贤[1] 

机构地区：[1]河海大学土木工程学院,江苏南京210098 [2]浙江省交通厅工程质量监督局,浙江杭州311215

出　　处：《河海大学学报（自然科学版）》2009年第4期419-424,共6页Journal of Hohai University(Natural Sciences)

基　　金：河海大学自然科学基金(2008428411)

摘　　要：根据灌注桩的受力特性及变形规律,建立了桩端土层较软和桩底沉渣较厚条件下的桩端荷载-沉降数学模型.基于假设的桩侧土荷载传递函数,对灌注桩沉降过程中桩侧土体的变形规律进行了研究,建立了桩侧土荷载传递线性软化模型条件下桩端土硬化非线性模型的荷载-沉降关系;依据桩侧土体完全弹性、弹性+软化、弹性+软化+残余、残余+软化、完全软化状态下的桩端土非线性模型的荷载传递关系,导出了单桩荷载传递公式,得到了桩侧土体多种状态下的桩顶荷载-沉降规律,并通过算例验证了该公式的合理性.According to the stress characteristics and deformation rules of cast-in-place piles, a mathematical model of load-settlement was established under the conditions of soft soil at the pile end and thick mud at the pile bottom. Based on the assumed transfer function, the deformation rules of soils around the cast-in-place piles during their settling were studied. A relationship between load and settlement of the hardening nonlinear model for the soils at the pile end was proposed based on the softening linear model for the load transfer of soils around the piles. On the basis of the load transfer function of the nonlinear model for soils at the pile end under conditions of complete elasticity, elasticity ＋ softening, elasticity ＋ softening ＋ residue, and residue ＋ and complete softening of soils around the piles, a load transfer equation of a single pile was derived, and the load-settlement rules at the pile top were obtained for various states of soils around the piles. The present equation was validated through engineering cases.

关 键 词：灌注桩 沉降 线性软化模型 荷载传递法 解析算法 

分 类 号：TU473.1[建筑科学—结构工程]