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Numerical study of one-dimensional compression in granular materials

机译:Numerical study of one-dimensional compression in granular materials

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摘要

The discrete element method has been employed to simulate vertical one-dimensional compression of an idealised soil. Direct measurement of the full stress tensor was possible and the results show that K0 (the ratio of horizontal to vertical effective stresses) increases with void ratio, which is consistent with previous experimental studies. The anisotropic fabric induced during compression was quantified by considering the orientations and magnitudes of the normal contact forces. For the denser samples there was a definite bias towards more vertically oriented contacts, resulting in lower stresses being transmitted in the horizontal direction for a given vertical stress. In contrast, the contacts were oriented more isotropically in the looser samples, allowing more similar stresses to be transmitted in the horizontal and vertical directions.
机译:离散元法已被用来模拟理想土壤的垂直一维压缩。可以直接测量全应力张量,结果表明K0(水平有效应力与垂直有效应力之比)随空隙率的增加而增加,这与以前的实验研究一致。通过考虑法向接触力的方向和大小来量化在压缩过程中引起的各向异性织物。对于较稠密的样品,朝着更垂直取向的接触有一定的偏向,导致在给定的垂直应力下,在水平方向上传递的应力较小。相反,在较松散的样品中,触头的取向更加各向同性,从而可以在水平和垂直方向上传递更多相似的应力。

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