抗滑桩计算的综合刚度与三参数法数值解  

NUMERICAL SOLUTIONS OF COMPOSITE STIFFNESS AND TRI-PARAMETER METHOD FOR CALULATION OF ANTI-SLIDE PILES

作　　者：邹盛堂[1] 戴自航[1] 

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《岩石力学与工程学报》2014年第A02期3718-3723,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：福建省自然科学基金重点项目(D0720001);福建省自然科学基金面上项目(2011J01308)

摘　　要：为更加可靠地计算抗滑桩的位移和内力,提出采用桩–土共同作用的综合刚度和地基抗力三参数法进行抗滑桩计算的方法,建立基于该方法的弹性地基杆系有限元数值解。根据某工程抗滑桩的推桩试验实测位移和弯矩,反演得到桩–土共同作用的综合刚度和地基抗力三参数,并将有限元数值分析结果与试验桩在各级荷载作用下的实测桩身位移和弯矩进行对比。研究结果表明:岩土体地基水平抗力参数表现为典型的非线性特性,当荷载增大导致桩身位移加大时,地基水平抗力参数明显减小,同时桩–土共同作用的综合刚度也存在一定程度地变小。In order to more reliably calculate the displacements and internal forces of anti-slide piles,the pile-soil composite stiffness under combined action and subgrade resistance tri-parameter method is presented to calculate anti-slide piles. Based on this method,numerical solution of link finite element is established. According to the measurements of displacements and bending moments of an engineering pile pushing test,the pile-soil composite stiffness under combined action and subgrade resistance tri-parameter are back analyzed. Then the calculation results obtained by finite element analysis are compared with the measurements of pile displacements and bending moments under different load grades. The results show that the horizontal resistance parameters of rocks and soils are nonlinear. With the increase of pile displacements caused by larger loads,the horizontal subgrade resistance parameters obviously decrease and the pile-soil composite stiffness under combined action diminishes to a certain extent.

关 键 词：桩基础 抗滑桩 内力 综合刚度 三参数法 杆系有限元 

分 类 号：TU473[建筑科学—结构工程]