Numerical modeling of stress-permeability coupling in rough fractures
Numerical modeling of stress-permeability coupling in rough fractures
复制标题
DOI：
10.1007/s10040-007-0254-1
复制
发表时间：
2008-03
影响因子：
2.8
通讯作者：
R. Walsh;C. McDermott;O. Kolditz
中科院分区：
文献类型：
--
作者：
R. Walsh;C. McDermott;O. Kolditz
建立了裂隙岩体中流动与力学变形耦合的数值模型。岩石节理对水压变化的力学响应受节理表面几何特性的强烈影响。这项工作的概念是将简单的有限元解与复杂而真实的裂缝表面几何形状相结合，以重现裂缝中常见的非线性应力-变形-渗透率耦合。基于对描述天然粗壁裂缝所需关键参数的大量研究，已经开发出新的方法来生成代表岩石基质中具有真实粗糙表面几何形状的离散裂缝的有限元网格。然后使用有限元代码GeoSys/Rockflow来模拟水力应力、机械应力和表面几何形状对单个离散裂缝渗透率演变的耦合影响。通过文献中的实例对模型概念进行了实验验证。建模结果也与一个简单的互穿模型进行了比较。
A numerical model is described for coupled flow and mechanical deformation in fractured rock. The mechanical response of rock joints to changes in hydraulic pressure is strongly influenced by the geometric characteristics of the joint surfaces. The concept of this work is to combine straightforward finite element solutions with complex and realistic fracture surface geometry in order to reproduce the non-linear stress-deformation-permeability coupling that is commonly observed in fractures. Building on the numerous studies that have expanded the understanding of the key parameters needed to describe natural rough-walled fractures, new methods have been developed to generate a finite element mesh representing discrete fractures with realistic rough surface geometries embedded in a rock matrix. The finite element code GeoSys/Rockflow was then used to simulate the coupled effects of hydraulic stress, mechanical stress, and surface geometry on the evolving permeability of a single discrete fracture. The modeling concept was experimentally verified against examples from the literature. Modeling results were also compared to a simple interpenetration model.