基于数字图像相关法的含填充裂隙大理岩单轴压缩破坏过程研究

doi:10.13722/j.cnki.jrme.2017.0742

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摘要采用数字图像相关方法(digital image correlation，DIC)对含不同填充裂隙大理岩单轴压缩破坏过程进行观测，通过分析破裂过程大理岩表面全局变形场的演化，结合电镜扫描(scanning electron microscope，SEM)技术，从定性和定量的角度，总结不同裂隙倾角和不同裂隙填充条件下裂纹起裂、扩展及贯通的规律。结果表明：预制裂隙倾角的变化，会对裂纹的起裂点、起裂角和岩石的强度产生不同程度的影响；而填充物的存在使得岩石的抗压强度有一定程度的提高；无论裂隙填充与否，裂隙大理岩的破坏大都为剪切和张拉共同作用的结果；由于填充物的影响，岩石在宏观上表现为翼裂纹主导的破坏形式，在细观上表现为明显的剪切破坏趋势；但当裂隙中无填充时，大理岩在宏观上则有翼裂纹和反翼裂纹这2种主导破坏形式，在细观上表现为较明显的张拉破坏趋势。因此，采用DIC方法定量描述岩石破裂过程的裂纹位移场演化，直观的判断含填充和未填充裂隙岩石断裂类型，突破了传统以经验为主判断岩石断裂类型存在的局限性，该研究有助于提升人们对含填充裂隙岩体破坏机制的认识。

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	袁媛1
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	潘鹏志1
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	赵善坤4
	王斌1
	宋桂红2

关键词 ：岩石力学, 数字图像相关法, 含填充裂隙, 不同倾角, 填充物, 破坏机制

Abstract：The experiments were carried out to investigate the failure process of marble which has cracks with infilling materials under uniaxial compression. The influence of the inclination angle of preexisting flaw and the different filling conditions on the failure process of rock were discussed through analyzing the characteristics of deformation evolution with the digital image correlation method(DIC) and scanning electron microscope(SEM). The results show that the change of the inclination angle of fracture affects the position of crack initiation，the crack angle and the strength of rock to some extent，while the improvement of the compressive strength is a result of fillers. Whether the fracture has filling or not，the failure modes of the rock are mostly because of the combination of shearing stress and tensile stress，but the damage patterns are different. On account of the fillings，the primary failure mode of rock is the wing crack macroscopically，and the shear failure is more obvious mesoscopically. When there is no fillings，two dominant failure modes of the wing crack and anti-wing crack are observed macroscopically and the tensile failure is more obvious mesoscopically.

Key words： rock mechanics digital image correlation filled crack different flaw inclination filler failure mechanism

引用本文:

袁媛1，2，潘鹏志1，3，赵善坤4，王斌1，宋桂红2. 基于数字图像相关法的含填充裂隙大理岩单轴压缩破坏过程研究[J]. 岩石力学与工程学报, 2018, 37(2): 339-351.
YUAN Yuan1，2，PAN Pengzhi1，3，ZHAO Shankun4，WANG Bin1，SONG Guihong2. The failure process of marble with filled crack under uniaxial compression based on digital image correlation. , 2018, 37(2): 339-351.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.0742 或 http://www.rockmech.org/CN/Y2018/V37/I2/339

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