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本文提出了一种离散元和边界元法相耦合的数值法,将粒状土层模拟为二维圆片状集合体来研究,在正常固结和超固结圆片状集合体材料中做了一系列锥顶角为60°的模拟触探测试。可以从这个模拟试验的微观分析以及传统的连续介质力学角度评价静力触探的机理。试验结果表明,土的加载历史影响了土的破杯机制和剪胀性,但对锥头底部以后的侧压力没有明显影响。此外还发现较细颗粒承受了较高的接触应力,囚此更容易在贯入过程中被压碎。
This paper proposes a numerical method coupled with the discrete element and the boundary element method, and simulates the granular soil layer as a two-dimensional circular plate-like aggregate to study it in a normal consolidated and over-consolidated circular plate-like aggregate material. The series cone angle is 60° simulated penetrating test. The mechanism of cone penetration can be evaluated from the microscopic analysis of this simulation experiment and the traditional continuum mechanics. The test results show that the loading history of soil affects the cup-breaking mechanism and dilatancy of the soil, but has no significant effect on the lateral pressure after the bottom of the cone head. In addition, it has been found that finer particles are subjected to higher contact stress and the prisoner is more likely to be crushed during the penetration process.