摘要
根据Biot固结理论,采用Laplace和Hankel变换方法得到了半空间饱和土体内受垂直载荷作用下的变换域内基本解,再根据虚拟桩法,得出了单桩的第二类Fredholm积分方程,最后通过对积分方程的数值求解得出了在圆形载荷作用下,单桩桩侧的负摩擦力以及桩的孔压消散变化的情况.数值结果表明,圆形载荷半径越大,负摩擦力的中性点逐渐上移的程度越大,而且孔压随载荷半径增加而增加.
According to Biot＇s consolidation and rheology theory, the general solutions to a vertical force applied at the interior of a saturated half space are developed via the Laplace transform and Hankel transform. Utilizing Muki＇ method, the second kind of Fredholm integral equation describing the interaction between a pile and the half space is obtained. After performing the inverse Laplace transform, the variations of negative friction force and the dissipation of the pore pressure in the time-space domain for a pile under the surcharge circular loading are gotten by the discrete integral method. Numerical results show that the surcharge circular load can generate some negative frication for the pile. The larger values the radius of the surcharge circular loads, the closer to the upper part of the neutral point of the negative friction pile moves. The negative pore pressure will increase with the increasing radius of the surcharge circular load.
出处
《南昌工程学院学报》
CAS
2008年第1期1-5,共5页
Journal of Nanchang Institute of Technology
基金
国家自然科学基金资助项目(50578071)
关键词
圆形荷栽
饱和土
桩基
负摩擦力
BIOT固结理论
FREDHOLM积分方程
circular load
saturated poroelastic soil
pile
negative friction force
Blot ＇ s consolidation and theology theory
Fredholm integral equation.
