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根据室内动三轴试验结果和地基土(粉土)中孔隙水压力的发展变化规律,结合达西定律,建立了考虑消散作用时地基土中孔隙水压力发展变化的计算模型,并推导了该计算模型的有限元形式,编制了相应的有限元计算程序;利用该计算模型和室内动三轴试验结果对高速列车作用下孔隙水压力发展变化过程进行了分析研究。结果表明:在高速列车通过时,地基中部分区域可能会发生液化现象,但是随着时间延长,地基土中孔隙水压力会逐渐消散;即使一列列车通过后不会发生液化现象,但如果通过的列车时间间隔较短,由于前几次列车通过时所产生的孔隙水压力无法充分消散,经过多次列车通过后,地基中也可以产生液化区域。
According to the results of indoor triaxial test and the development and variation of pore water pressure in foundation soil (silt), combined with Darcy’s law, the calculation model for the development of pore water pressure in foundation soil considering dissipative effect is established. The finite element method is used to calculate the finite element method of the model and the corresponding finite element program is developed. The development of the pore water pressure under the action of high-speed train is analyzed by using the calculation model and the indoor triaxial test. The results show that liquefaction may occur in some areas of the foundation when passing by high-speed trains, but the pore water pressure in the foundation soil will gradually dissipate with the passage of time. Even if a train passes without liquefaction, The train time interval is short, due to the pressure of the pore water generated by the previous trains can not be fully dissipated, liquefaction area can also be generated in the foundation after passing through many trains.