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Investigating the effects of particle shape on normal compression and overconsolidation using DEM

机译：使用DEM研究颗粒形状对正常压缩和过度固结的影响

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Discrete element modelling of normal compression has been simulated on a sample of breakable two-ball clumps and compared to that of spheres. In both cases the size effect on strength is assumed to be that of real silica sand. The slopes of the normal compression lines are compared and found to be consistent with the proposed equation of the normal compression line. The values of the coefficient of earth pressure at rest K-0,K-nc are also compared and related to the critical state fiction angles for the two materials. The breakable samples have then been unloaded to establish the stress ratios on unloading. At low overconsolidation ratios the values of K-0 follow a well-established empirical relationship and realistic Poisson ratios are observed. On progressive unloading both samples head towards passive failure, and the values of the critical state lines in extension in q-p' space are found to be consistent with the critical state angles deduced from the values of K-0 during normal compression. The paper highlights the important role of particle shape in governing the stress ratio during both normal compression and subsequent overconsolidation.
机译：在一个易碎的两球团块样本上模拟了正常压缩的离散元素建模，并将其与球体进行了比较。在这两种情况下，尺寸对强度的影响均假定为真正的硅砂。比较法向压缩线的斜率，发现与建议的法向压缩线方程式一致。还比较了静止时的土压力系数K-0，K-nc的值，并与两种材料的临界状态摩擦角有关。然后将易碎样品卸载，以建立卸载时的应力比。在低固结比下，K-0值遵循公认的经验关系，并观察到了现实的泊松比。在逐渐卸载时，两个样本都趋向于被动失效，并且发现在q-p'空间中扩展的临界状态线的值与从正常压缩期间从K-0值推导出的临界状态角一致。本文强调了颗粒形状在控制正常压缩和随后的超固结过程中的应力比中的重要作用。

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