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土壤是典型的松散介质,利用粘连的颗粒离散元模型模拟土壤聚团的行成及破裂一直是散体力学的热点之一。本研究详细描述了利用带粘连的颗粒离散元模型制备土壤聚团的方法,利用粘连颗粒离散元模型对土样单轴压缩试验进行数值模拟分析,将模拟结果与试验结果进行对比分析。结果表明:试验与模拟得到的压缩曲线走势吻合,均呈拟线性上升,达到峰值后光滑下降;试验和模拟得到的土壤压缩时的强度极限分别为21.5和24 kPa,模拟值高于试验值11.6%。
Soil is a typical loose medium. It is always one of the hot topics in the field of stracture mechanics to simulate the formation and rupture of soil agglomeration by using the granular discrete element model. In this study, a detailed description of the method of making agglomeration of soil aggregates by using the discrete particle model with adhesion was developed. The uniaxial compression tests of soil samples were numerically simulated by the discrete element model of adhesion particles. The simulation results and the experimental results were compared. The results show that the curves of the compression curves obtained by the experiment and the simulation agree well with each other and all show a quasi-linear increase, reaching a peak value and then falling smoothly. The ultimate compressive strength of the soil under compression tests and simulations are 21.5 and 24 kPa respectively, and the simulated values are higher than the experimental values of 11.6 %.