摘要
为了更好地模拟多材料介质无压渗流问题,提出了一种基于颗粒离散元的离散颗粒渗流模型(discrete seepage element model,DSEM)。该模型将连续介质离散化为密集堆积的颗粒系统,赋予颗粒流体性质,并通过颗粒间压力差模拟渗流过程。DSEM模型能够自动计算自由面位置和水头分布,无须预设自由面位置。为了验证DSEM模型的有效性,首先,模拟了土坝渗流问题,模拟结果与室内模型试验结果一致。随后,模拟了双材料矩形坝和分层土体渗流问题,并与其他数值方法进行比较,证明了DSEM在多种材料问题中的有效性。最后,将DSEM应用于分区梯形坝的渗流问题,成功计算了不同渗透系数下的自由面位置。研究结果表明,DSEM模型适用于多材料介质的无压渗流问题,为工程渗流问题提供了一种新的有效计算方法。
To better simulate the unconfined seepage problems in multi-material media,A discrete seepage element model(DSEM)based on the discrete element method for particles was proposed.This model discretizes the continuous medium into a densely packed system of particles,endows the particles with fluid properties,and simulates the seepage process through the pressure difference between particles.The DSEM model can automatically calculate the position of the free surface and the distribution of the water head without the need to pre-set the position of the free surface.To verify the effectiveness of the DSEM model,the seepage problem of an earth dam was first simulated,and the simulation results were consistent with the results of laboratory experiments.Subsequently,the seepage problems of a double-material rectangular dam and a stratified soil were simulated,and when compared with other numerical methods,the effectiveness of the DSEM in problems involving multi-materials was demonstrated.Finally,the DSEM was applied to the seepage problem of a zoned trapezoidal dam,successfully calculating the positions of the free surface under different permeability coefficients.The research results indicate that the DSEM model is suitable for solving seepage problems in multi-material media and provides a new and effective computational method for solution of seepage problems in engineering.
作者
吕学科
LYU Xueke(Fourth Engineering Co.,Ltd of China Railway 18th Bureau Group,Tianjin 300350,China)
出处
《内蒙古工业大学学报(自然科学版)》
2025年第4期362-369,共8页
Journal of Inner Mongolia University of Technology:Natural Science Edition
基金
天津市津南区“揭榜挂帅”科技计划项目(2023JB03)。
关键词
离散元
无压渗流
自由面
多层材料介质
discrete element method
unconfined seepage
free surface
multi-material medium
