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基于实测资料,假设列车轮载经钢轨传递下来的荷载由5根枕木承担。根据分担比,获得了道渣层表面非均布荷载的表达式。将道渣层视为单相弹性介质,软土地基被看成是考虑水土耦合作用的饱和多孔介质。借助势函数,利用Helmholtz矢量分解法及Fourier变换技术分别对弹性土体和饱和半空间土体进行求解,得到非均布移动荷载作用下软土地基位移、应力及孔压响应在变换域内的精确解答。利用FFT算法得到了数值结果,详细分析了荷载分布形式、观察点位置、道渣性质以及软土地基渗透系数对动力响应的影响。研究结果表明:高速情况下动力响应与低速情况有很大不同;对于软土路基,应特别注意列车高速运行时路基浅层范围内产生的孔压响应。
Based on the measured data, it is assumed that the load on the train wheel carried by the rail is borne by five sleepers. According to the sharing ratio, the expression of non-uniform load on the surface of slags is obtained. The ballast layer is considered as a single-phase elastic medium, which is considered as a saturated porous medium considering soil-water coupling. Using the potential function, the Helmholtz vector decomposition method and the Fourier transform technique are used to solve the elastic soils and the saturated half-space soil respectively. The displacement, stress and pore pressure response of the soft ground under the non-uniform distributed moving loads are obtained. answer. The numerical results are obtained by using FFT algorithm. The influence of load distribution, observation point location, ballast properties and permeability of soft soil foundation on dynamic response are analyzed in detail. The results show that there is a great difference between the dynamic response and the low speed under the high speed condition. For the soft soil subgrade, special attention should be paid to the pore pressure response generated in the shallow subgrade of the train at high speed.