基于线性DFN-FEM模型的隧道开挖分析

Martin Lebeda, P. Kabele
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引用次数: 0

摘要

隧道开挖模拟必须考虑围岩中节理和断层的自然存在,而节理和断层是控制隧道力学响应的主要因素。在本文中,我们介绍了利用随机生成离散断裂网络(DFNs)导出的等效岩体特性对开挖进行三维有限元分析的工作进展。等效刚度由体积平均法确定。目前,我们对应力状态的增量变化进行线性求解。假定断裂的刚度取决于作用于其正方向的初始正应力。然而,在求解的增量步骤中,我们假设断裂的刚度是恒定的。这种假设对于小的应力变化是可以接受的。由于DFN模型所表示的裂缝具有优先方向,因此等效刚度是各向异性的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of tunnel excavation based on linear DFN-FEM modelling
Simulations of tunnel excavations have to take into account the natural occurrence of joints and faults in the surrounding rock mass, which dominantly control its mechanical response. In this paper, we present work in progress toward 3D finite element analysis of excavation using equivalent rock-mass properties derived from stochastically generated discrete fracture networks (DFNs). The equivalent stiffness is determined by volume averaging. Presently, we solve the problem linearly for an incremental change of the stress state. The fracture’s stiffness is assumed to depend on the initial normal stress acting in direction normal to it. However, within the solved incremental step, we assume the fracture’s stiffness to be constant. This assumption is acceptable for small stress changes. Since the fractures represented in the DFN model have preferred directions, the equivalent stiffness is anisotropic.
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