Fracture mechanisms in soft rock: Identification and quantification of evolving displacement discontinuities by extended digital image correlation
Fracture mechanisms in soft rock: Identification and quantification of evolving displacement discontinuities by extended digital image correlation
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DOI：
10.1016/j.tecto.2010.09.024
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发表时间：
2011-04-25
期刊：
影响因子：
2.9
通讯作者：
Viggiani, Gioacchino
中科院分区：
文献类型：
--
作者：
Tuong Lam Nguyen;Hall, Stephen A.;Viggiani, Gioacchino
浅深度岩石的变形（即，在低围压下）主要由新裂缝的演化或预先存在的裂缝的扩展和合并驱动。在本文中，从倾斜的裂纹（切口）在平面应变单轴压缩变形的软岩断裂演化进行了分析，使用高分辨率的数字照片和数字图像相关（DIC）。DIC提供运动学的全场测量，从而允许分析非均匀变形。然而，标准DIC方法不能正确处理裂缝，因为它们是位移不连续的。因此，一个扩展的DIC方法，允许自动跟踪的不连续性和量化的位移跳跃沿着他们的长度。使用这种方法的空间和时间的裂缝演化的分析，提高了理解的现象，因为它提供了实验定量的断裂模式（打开/关闭和剪切）。(C)2010爱思唯尔有限公司版权所有。
Deformation of rocks at shallow depths (i.e., at low confining pressures) is primarily driven by the evolution of new fractures or the propagation and coalescence of pre-existing ones. In this paper, fracture evolution from inclined flaws (cuts) in a soft rock deformed under plane-strain uniaxial compression is analyzed using high-resolution digital photographs and Digital Image Correlation (DIC). DIC provides a full-field measurement of the kinematics and thus allows the analysis of non-homogeneous deformation. However, standard DIC approaches do not handle correctly fractures, as they are displacement discontinuities. Therefore, an extended DIC method is developed that allows automatic tracing of discontinuities and their quantification in terms of the displacement jumps along their length. The analysis of spatial and temporal fracture evolution using this method enhances the understanding of the phenomena in that it provides experimental quantification of fracture mode (opening/closing and shearing). (C) 2010 Elsevier B.V. All rights reserved.