软土固结试验数值模拟

基于太沙基一维固结理论，采用有限差分法对室内固结试验进行了数值分析，编制了室内固结试验的C++数值程序和自动求解固结系数的Matlab拟合程序，该程序能够模拟不同尺寸（排水高度）软土试样的固结过程。讨论了试样尺寸、渗透系数和初始固结应力对模拟结果的影响。数值结果显示随着排水高度和渗透系数的增加，由时间平方根法和时间对数法求解的固结系数比不断减小，且排水高度较小时固结系数比变化较快。土体初始应力越小，主固结完成所需的时间越长。与日本广岛重塑土大尺寸试样固结试验结果进行了比较分析。研究结果表明所采用的数值方法能够较好地模拟软土的固结试验过程，可以进行一定条件下大尺寸软土试样的固结特性研究，研究成果对于揭示软土的固结变形发展有一定的理论价值和实际意义。

Numerical simulation of oedometer test for soft soil

Based on Terzaghi’s one-dimensional consolidation theory, a numerical simulation procedure of oedometer test is developed using the finite difference method. A numerical simulation program written in C++ is implemented and a Matlab fitting process of automatic solving coefficient of consolidation is also developed. The program can simulate the consolidation process of sample with different sizes (drainage heights). Several effect factors such as drainage height, hydraulic conductivity and initial stress, are discussed in detail. The numerical results indicate that the ratio of consolidation coefficient obtained from square root of time method and log time method decreases with the increasing of drainage height and hydraulic conductivity. This variation is more obvious in the condition of lower drainage height. The less of the initial stress, the more time needed for the primary consolidated process. Finally, the numerical simulation results are compared with a set of test data for different drainage heights. The numerical results indicate that the proposed numerical simulation procedure could simulate the oedometer test well, and make it possible to analyze the consolidation properties for largy size specimens under certain conditions, which have a certain theoretical and practical significance for revealing the deformation of soft soil consolidation.