Characterization of the effect of normal load on the discontinuity morphology in direct shear specimens using X-ray micro-CT
Characterization of the effect of normal load on the discontinuity morphology in direct shear specimens using X-ray micro-CT
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DOI：
10.1007/s11440-014-0320-5
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发表时间：
2014-05
期刊：
影响因子：
5.7
通讯作者：
B. Tatone;G. Grasselli
中科院分区：
文献类型：
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作者：
B. Tatone;G. Grasselli
脆性地质材料（包括混凝土和岩石）中的不连续性代表了局部薄弱区和增强的水力渗透，这些区域通常控制着介质的流体力学行为。不连续面的剪切和由此产生的形态变化可以显著改变这种行为。在这项工作中，开发了一个程序来表征剪切不连续副本作为一个功能的应用正常负载使用X射线微计算机断层扫描（微CT）图像。一个标本设计和测试程序，便于CT扫描沿着与图像处理程序，以量化标本的形态变化。随后，直接剪切试验和基于图像的平均裂缝孔径，表面积，中值有效孔径，和裂缝空隙空间的优先方向的测量结果，并进行了讨论。本文开发的程序的应用产生剪切不连续的形态特征，以前不可能获得或耗时收集破坏性切片方法。
Discontinuities in brittle geomaterials, including concrete and rock, represent localized zones of weakness and enhanced hydraulic transmissivity that often control the hydromechanical behavior of the medium. The shearing of discontinuities and the resulting morphological changes can significantly alter this behavior. In this work, a procedure is developed to characterize sheared discontinuity replicas as a function of the applied normal load using X-ray micro-computed tomography (micro-CT) imagery. A specimen design and testing procedure that facilitates CT scanning is presented along with an image processing procedure to quantify the morphological changes in the specimens. Subsequently, the results of direct shear testing and image-based measurements of mean fracture aperture, surface area, median effective aperture, and the preferential orientation of fracture void space are presented and discussed. Application of the procedure developed herein yields characteristics of the morphology of sheared discontinuities that were previously not possible to obtain or that were time consuming to collect with destructive sectioning methods.