Differential strain analysis: A new method for examining cracks in rocks
Differential strain analysis: A new method for examining cracks in rocks
复制标题
差应变分析：检查岩石裂缝的新方法
DOI：
10.1029/jb079i029p04383
复制
发表时间：
1974
影响因子：
--
通讯作者：
M. Feves
中科院分区：
文献类型：
--
作者：
G. Simmons;R. Siegfried;M. Feves
岩石试样的线性应变与熔融石英参考试样的线性应变之差可以测量到2 × 10/sup -6/的精度。含非静水应力裂缝的花岗岩和含冲击裂缝的花岗闪长岩2个试样的压缩曲线均包含线段。仅由这些线性段组成的压缩曲线意味着裂纹长径比α谱在一个或多个值处出现尖峰，而同时包含线性段和平滑变化段的压缩曲线意味着裂纹谱由尖峰函数和平滑变化函数组合而成。因此，有些岩石包含具有离散α值的裂缝集，而另一些岩石包含既有α的离散值又有α的连续分布的裂缝集。
The difference between the linear strain of a rock specimen and a reference sample of fused silica can be measured to a precision of 2 x 10/sup -6/. Compression curves of 2 samples, a granite with cracks produced by nonhydrostatic stress and a granodiorite with shock-induced cracks, contain linear segments. Compression curves that consist solely of such linear segments imply that the spectrum of crack aspect ratios alpha is sharply peaked about one or more values, whereas compression curves that contain both linear segments and smoothly varying segments imply that the crack spectrum consists of sharply peaked functions combined with smoothly varying functions. Therefore, some rocks contain sets of cracks with discrete values of alpha, and other rocks contain sets with both discrete values of alpha and continuous distributions of alpha.