A new device for investigating the hydro‐mechanical properties of rock joints
A new device for investigating the hydro‐mechanical properties of rock joints
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DOI：
10.1002/nag.285
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发表时间：
2003-05
影响因子：
4
通讯作者：
J. Hans;M. Boulon
中科院分区：
文献类型：
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作者：
J. Hans;M. Boulon
提出了一种新的实验系统，该系统由两个装置组成，用于研究岩石节理和其他界面的水力传导性与其机械载荷的关系。该系统可用于研究渗透系数的各向异性及其非均质性。第一个装置控制在岩石节理样品中心附近的压力或流量调节的流体的注入，在节理内产生准径向流动。使用扇形外围膜实时测量输出流量，以获取有关流量方向性或各向异性的数据。第二个装置允许测量岩石节理在机械载荷(压缩或剪切)过程中的形态演变和空隙图。它是一束通过(x，y)标架移动的激光。这种框架在加载的几个阶段被安装在剪切箱内，在临时将一个岩壁从另一个岩壁上移走后，但没有将它们从剪切箱中卸下。在介绍了实验系统及其性能后，我们给出了一些岩石节理在压缩和剪切载荷下的模拟试验结果的例子。首先，这些结果表明，岩样总透过率的变化与岩壁的法向相对位移密切相关。在考虑节理粗糙度损伤的情况下，对空泡图的变化进行了几种统计分析，并与定向输出流的结果进行了比较。今天，基于测量的空隙图，涉及有限元和有限体积模型的节理内流动的进一步研究正在进行中，以便与实验结果进行更精确的比较。版权所有©2003 John Wiley&Sons，Ltd.
A new experimental system composed of two devices is presented for studying the hydraulic conductivity of rock joints and other interfaces in relation with their mechanical loading. This system allows for investigations on the anisotropy of the hydraulic conductivity, as well as for its heterogeneity. The first device controls the injection of a fluid, regulated in pressure or discharge near the centre of the sample of rock joint, which produces a quasi‐radial flow within the joint. The output flow is measured in real time using a sectorized peripheral membrane for acquisition of data about the directionality or anisotropy of the flow. The second device allows for the measurement of the evolution of the morphology and of the void map of the rock joints during their mechanical loading (compression or shearing). It is a laser beam moved by an (x, y) frame. This frame is installed within the shear box at several stages of the loading, after temporarily moving one rock wall away from the other one, but without unmounting them from the shear box. After the presentation of the experimental system, and of its performances, we give some examples of test results of replicas of rock joints, loaded in compression and shearing. First, these results show that the change in global transmissivity of the samples is strongly correlated with the normal relative displacement of the rock walls. Several statistical analyses of the change in the void map, taking into account the damage of the asperities of the joint, are presented and compared with the results of the directional output flows. Today further studies involving a FEM as well as a finite volume modelling of the flow within the joints, based on the measured void map are in progress for a more precise comparison to the experimental results. Copyright © 2003 John Wiley & Sons, Ltd.