基于多段荷载传递法的桩基荷载-沉降解析解  

Analytical Solution on the Load-Settlement of Single Pile Using the Multi-Linear Load Transfer Method

作　　者：王腾[1] 卢淑芹[2] 陈金霞[2] 沈园园[2] 

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石油冀东油田分公司钻采工艺研究院,河北唐山063004

出　　处：《沈阳建筑大学学报（自然科学版）》2015年第3期442-448,共7页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51179201);中国高校基本科研业务费专项基金项目

摘　　要：目的推导出桩侧土桩基荷载-沉降解析解,为在理论上探讨桩的轴向静载与沉降之间的关系、计算桩的极限荷载、桩身轴力和桩侧剪力提供一种较为实用的方法.方法利用多组并联弹簧组来模拟桩侧土荷载传递曲线,建立桩侧土的多段线性荷载传递函数模型,模拟桩土间弹塑性本构关系,以荷载传递函数法为基础,并巧妙地利用双曲函数变换和传递函数.分析了砂土侧摩阻力的变化对桩基荷载-沉降曲线的影响,并与专业桩基计算软件结果进行对比.结果求得了桩侧土处于弹性、弹塑性和弹-塑-滑移状态下桩身内力与节点位移的解析表达式,并递推得到了桩顶荷载-沉降关系和桩顶刚度的解析解.结论多段荷载传递法求得的荷载-沉降曲线与专业桩基计算软件结果基本吻合,说明了该方法的有效性和解析解的正确性.A analysis solution method for the single pile load-settlement was obtained to give some theoretical references for determining of pile axial load-settlement, ultimate load and pile side shear. Based on the load-transfer method and the hyperbolic transfer function, using a multi-parallel spring groups to simulate the load-transfer of pile soil, a multi-linear load-transfer function model was built to simulate the elastic-plastic constitutive relation of pile soil. Analytical expression for e- lastic, elastic-plastic and slip-elastic-plastic pile forces and node displacements along the pile length were derived and recursive formula for load, settlement and the stiffness at the pile top were ob- tained. Influences of sand skin friction on load-displacement curve were analyzed and compared with the results of professional software for pile design. Results show that the obtained load-displacement curves by the proposed formula are very closed to the results of professional software, which verifies the rationality and correctness of the formula.

关 键 词：桩 荷载-沉降 解析解 多段荷载传递函数 双曲函数 

分 类 号：TU473[建筑科学—结构工程]