基于单轴压缩试验的岩石单裂纹扩展及损伤演化规律研究

doi:10.13722/j.cnki.jrme.2015.1270

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摘要通过室内试验，利用数字图像相关方法(DICM)等研究手段，对含不同预置单裂纹的类岩石材料在单轴压缩下的裂纹扩展规律及岩体细观损伤演化机制进行系统研究。研究表明：预置单裂纹倾角为15°和30°时，最大应变集中在预置裂纹的尖端靠内侧的位置，新裂纹为翼裂纹，起裂主要受张拉应力控制；当增大到60°和75°时，最大应变集中区移动到裂纹尖端区域，新裂纹为次生裂纹，起裂主要受剪切应力控制；倾角 = 45°时试样包含2条裂纹扩展路径，为2种裂纹类型转变的临界角度值；随着倾角的增加，试样起裂应力逐渐增大；当 = 30°时，试样的单轴抗压强度最低，裂纹的扩展速度最快；裂纹扩展主要受张拉应力控制时，试样的单轴抗压强度和起裂应力均显著低于主要受剪切应力控制时的情况。

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	赵程1
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	森田千寻4

关键词 ：岩石力学, 室内试验, 数字图像方法, 类岩石材料, 单裂纹, 起裂应力

Abstract：Through laboratory test by employing the digital image correlation method(DICM)，the laws of crack propagation and mechanism of plastic deformation of rock-like material with single crack pre-existing with various inclined angles when subjected to static loading are studied. The results show that when the inclined angle = 15° and = 30°，the position of the maximum strain is near the inner crack tip point，the new crack propagation begins at the initial crack wing，and the tension stress is the main reason of the new crack generation and propagation. With the increasing of ，when = 60° and = 75°，the strain concentration is detected at the crack tip. The main propagation mode of new cracks is secondary cracks，and the shear stress play a dominant role. There are both wing cracks and secondary cracks when = 45°. The crack initiation stress increases as increasing. The sample shows there are the minimum compression strength and the fastest crack propagation speed when = 30°. The uniaxial compressive strength of the sample with secondary cracks is significantly higher than that sample with wing cracks.

Key words： rock mechanics laboratory test digital image correlation method rock-like material single crack

引用本文:

赵程1，2，刘丰铭1，2，田加深3，松田浩4，森田千寻4. 基于单轴压缩试验的岩石单裂纹扩展及损伤演化规律研究[J]. 岩石力学与工程学报, 2016, 35(S2): 3626-3632.
ZHAO Cheng1，2，LIU Fengming1，2，TIAN Jiashen3，MATSUDA Hiroshi4，MORITA Chihiro4. Study on single crack propagation and damage evolution mechanism of rock-like materials under uniaxial compression. , 2016, 35(S2): 3626-3632.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.1270 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS2/3626

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