根据带相变瞬态温度场的热量平衡控制微分方程,采用有限元方法计算分析了青藏铁路路基的瞬态温度场.随后,根据温度场的分布特点,应用Biot动力固结理论推导出的Biot动力固结控制方程,采用热、力间接耦合方法对青藏铁路路基在列车荷载作用下的瞬态动力问题进行了数值模拟,并系统的分析了列车荷载作用下铁路路基内的振动孔隙水压力、应力、位移等动力响应特点.
Based on the governing differential equations of the transient temperature field with phase change, the temperature field in the Qinghai-Tibetan railway embankment is analyzed through using finite element formulae deduced by Galerkin method. Following, according to the characteristics of the temperature field and the Biot dynamic consolidation equations deduced by Blot dynamic consolidation theory, the dynamic response of Qinghai-Tibetan railway embankment under train load is computed by adopting heat force indirect coupling method. The vibration pore water pressure, stress and displacement in the embankment are analyzed systematically.