【摘要】 取用多年冻土地区代表性土类进行冻土路基室内足尺模型试验,建立伴有相变的路基非稳态温度场的控制方程,在空间域内用采用混合单元的有限元网格划分,在时间域内用有限差分格式划分的混合解法进行有限元分析。通过对观测结果进行数值模拟,验证了数学模型的正确性。进一步分析路基温度场的变化规律与野外观测结果的变化规律,其一致性说明了室内模型试验可以模拟野外冻土路基的真实情况,为研究冻土路基温度场的变化规律提供了可靠依据。更多还原

【Abstract】 The permafrost sub-grade large-scale test was carried out with typical soil in permafrost zone to simulate the real field condition. This paper formulated the control equation of non-steady temperature field with phase changing, analyzed te equation with the finite-element method by adopting the grid segmentation of the mixture cell in space domain and by the mixture solution of the finite difference format segmentation in time domain, and validated the accurate of the mathematics model by numerically simulating the observing results. By further analyzing the changineg law of both the temperature field of the sub-grade and the field observing results, the consistency of the analyzing shows that the indoor model test can simulate the real status of the field permafrost sub-grade. It provides reliable guarantee for studying the changing law of the temperature field of the permafrost sub-grade.更多还原