三维模态变形体离散元方法及应用研究

首先建立了三维模态变形体离散元(3MDEM)方法,阐述了其基本原理及特点,并应用一系列算例进行了验证。这些算例涵盖了静力到动力、小变形到大位移、连续到非连续等各种不同情况,以综合验证模态变形体离散元实际的计算能力。结果表明,3MDEM在小变形以及连续介质力学领域可以给出和有限元相媲美的应力和位移结果,而在大变形、大位移强非线性领域可以给出与3DEC相媲美的计算结果。最后本文对1981年梅花拱坝的溃坝过程进行仿真研究。通过分析得知,梅花拱坝由于周边缝施工设计不当,沿周边缝抗剪强度过小,导致蓄水后坝肩推力促使坝体沿周边缝发生整体上滑,拱坝失去支撑最终坝体断裂并溃决。

Three-dimensional Modal Deformable Discrete Element Method and Its Application Study

In this paper,the basic principles and characteristics of 3MDEM are detailed and the practical computational capability of the method is comprehensively demonstrated through trial computation of a series of different problems consisting of various situations,from static to dynamic problems,from small to large deformations and from continuous to discontinuou media by use of 3MDEM.It indicates that for small deformation problems and continuous media the stresses and displacements obtained by using 3MDEM appro...