桩周饱和黏土非齐次渗流固结解

针对桩周饱和黏土固结渗流问题,考虑固结开始时,场地附近的河流或水库水位影响,建立桩端平面水头边界;考虑基桩以承压含水砂砾石为持力层,或为加速固结排水设计砂井抽水降压等措施的影响,建立桩尖平面水力梯度边界。综合上述边界得到反映桩周饱和黏土超静孔隙水压力消散规律的定解方程,对定解方程进行齐次化运算并推导其解答。根据理论解答,得到超静孔隙水压力随边界条件、初始条件的变化,绘制等值线和流速矢量图,直观比较分析解答的合理性,并应用现有实测试桩承载力换算固结度,验证了解答的正确性。

Analytical solution for inhomogeneous seepage consolidation in saturated clay around a single pile

Aiming at the problem of seepage consolidation in saturated clay around a single pile,the inhomogeneous boundary condition of the water head was established considering the influence of water level change of river or reservoir near the site. The influence of confined-water bearing layer of sand and gravel, or the measures of pumping water from sand wells to accelerate consolidation and drainage was included, and the boundary condition of hydraulic gradient was established. Based on the boundary conditions, the definite solution conditions reflecting the dissipation of excess pore water pressure in saturated clay around the pile were established.The homogeneous operation was then carried out and the solution was deduced. According to the derived theoretical solution, the pore-water pressure variation with boundary and initial condition wasobtained. The contour and the velocity vector diagram were drawn for intuitive comparison and analyzing the rationality of the solution. The actual bearing capacity of a single pile was used to convert the consolidation degree data to verify the correctness of the solution.