摘要
管桩低应变检测时,平截面假定并不满足,应力波的传播不能简单地用一维波动方程描述。对于薄壁的大直径管桩,桩顶各点的动力响应沿径向变化不大,因此,可以假定各物理量沿径向无变化而建立只含有变量z,θ,t的波动方程。采用分离变量法和常数变易法求得了该波动方程的解析解,并对一个算例进行了计算分析,探讨了桩顶的动力响应和平截面假定的影响深度问题,并把计算结果与一维波动理论以及三维有限元的结果进行了对比分析。
The plane-section assumption was not congruous in low strain dynamic tests on pipe piles, so the propagation of stress wave couldn't be expressed by 1D wave equation. The difference of dynamic response of large diameter thin-wall pipe pile along the radial direction was neglectable, and the dynamic response was assumed to be the same along the radial direction, as a result, only variables z, θand t were contained in the wave equation. The analytical solution of the wave equation was obtained by separation of variables and the method of variation of the parameters. A case history was analyzed to discuss the dynamic response at the top of pile and the influence of plane-section assumption on effective depth, and the results were also compared with the results of 1D wave theory and 3D FEM.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2007年第11期1611-1617,共7页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金资助项目(50679017)
江苏省"六大人才高峰"基金资助项目(50528512)
关键词
管桩
低应变检测
动力响应
解析解
三维效应
pipe pile
low strain test
dynamic response
analytical solution
three-dimensional effect