饱和单层土体一维热固结精确解

岩土体在非等温场下的固结响应一直是研究热点。基于考虑渗流的饱和土热固结控制方程,给出了一种三类任意边界条件下,饱和单层土体一维热固结精确解的求解方法。首先,利用函数φ将对温度和超静孔压的求解转换为对函数φ的求解,采用分离变量法,结合边界条件得到微分方程的特征函数。然后,将非齐次边界条件齐次化,利用微分方程的特征函数,采用系数变易法,给出非齐次边界条件下的精确级数解。最后,通过算例揭示土体边界的透水条件及温度变化对土体热固结响应影响显著。

Exact solutions for one-dimensional thermal consolidation of single-layer saturated soil

The consolidation under the non-isothermal field has long been the research focus. Based on the governing equations which take seepage flow into consideration, a new method to obtain exact solutions for one-dimensional thermal consolidation of single-layer saturated soil with three types of arbitrary boundary conditions is proposed. Firstly, the aim to solve temperature and excess pore pressure is transformed to solve the function ? by introducing the function φ. The eigenfunctions of differential equations are achieved with boundary conditions by the method of separation of variables. The nonhomogeneous boundary conditions are then transformed into homogeneous ones. The series form exact solutions are put forward according to the method of undetermined coefficients and eigenfunctions of differential equations. Finally, the conclusions that the seepage and temperature boundary play an important role in the thermal consolidation of the soil are reached by case studies.