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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。
Based on the one-dimensional consolidation theory of the terza sand foundation, the finite difference method is used to analyze the numerical results of the indoor consolidation experiment. The C ++ numerical program for the consolidation test and the Matlab fitting program for the automatic determination of the consolidation coefficient are prepared. The program can simulate Different size (drainage height) soft soil consolidation process of the sample. The effects of sample size, permeability coefficient and initial consolidation stress on the simulation results are discussed. Numerical results show that with the increase of drainage height and permeability coefficient, the ratio of consolidation coefficient solved by time-squared root method and time-logarithm method decreases continuously, and the consolidation coefficient ratio changes rapidly when the drainage height is smaller. The smaller the initial stress of soil, the longer it takes to complete the main consolidation. And Japan Hiroshima remolded soil consolidation test results of large-scale samples were compared. The results show that the numerical method can simulate the consolidation test of soft clay well, and the research on the consolidation characteristics of large-size soft clay under certain conditions can be carried out. The results of the research can be used to reveal the consolidation deformation of soft clay A certain theoretical value and practical significance.