含天然硬性结构面大理岩破裂过程与机制研究

doi:10.13722/j.cnki.jrme.2017.1279

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摘要以2种不同矿物含量的天然硬性结构面大理岩为研究对象，采用数字图像相关方法实时跟踪整个破坏过程中岩石表面的变形场演化，研究单轴压缩条件下大理岩试样中天然硬性结构面的起裂、扩展和贯通直至破坏的整个过程，结合电镜扫描技术，系统探讨其变形与强度特征以及硬岩破坏的硬性结构面控制效应。结果表明：结构面的矿物成分含量影响着岩石的整体力学性质，当结构面与母岩矿物成分含量相差较大时，试样整体强度降低且变形相对较小；而当结构面与母岩矿物含量接近时，硬性结构面的产状对大理岩破裂过程起控制作用，且并非所有的硬性结构面都会对大理岩的变形破坏产生影响；采用位移场和应变场演化相结合，可以更好的描述加载全程硬性结构面从弱非连续到强非连续的变形破坏过程；大部分岩样在加载初期，其变形场并没有由于硬性结构面的存在而产生明显的位移非连续特征，硬性结构面在破坏前变形较小，破坏在短时间内发生，造成能量急剧释放，该研究有助于解释硬性结构面控制型岩爆发生的力学机制。

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	苏方声1
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	潘鹏志1
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	高要辉1
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	冯夏庭1
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	刘畅1
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关键词 ：岩石力学, 数字图像相关方法, 天然硬性结构面, 破裂过程, 破裂类型, 变形局部化带

Abstract：In order to investigate the initiation，propagation and coalescence of the natural stiff discontinuity，a series of uniaxial compression tests were carried out on two types of jointed marbles with different mineral contents and the evolution of rock deformation was captured using the digital image correlation(DIC) technique. Moreover，the scanning electron microscope(SEM) technique was used to study the characteristics of strength and deformation of jointed rock and failure mechanism as well as the structure-control effect. It was found that the whole mechanical properties of rock specimen were influenced by the relationship of the mineral contents between the discontinuity and host rock，that the strength of the rock specimen would decrease and the deformation was little when their mineral contents were different largely，and that the attitude of the discontinuities would take control of the rock fracture process when their mineral contents were similar. Based on the deformation field and strain field，it was better to describe the process of rock discontinuity from weak and non-continuous failure to strong and non-continuous failure. The existence of rock discontinuity did not make the rock specimens characterized with non-continuous properties during the initial loading stage. The rigid structure plane was less deformed before the destruction，and the damage occurred in a short time，resulting in the rapid release of energy. The results can help to explain the mechanical mechanism of rigid structure plane controlled rock burst.

Key words： rock mechanics digital image correlation method natural hard structural plane fracturing process failure modes localized deformation zone

引用本文:

苏方声1，2，潘鹏志1，2，3，高要辉1，2，冯夏庭1，3，刘畅1，2. 含天然硬性结构面大理岩破裂过程与机制研究[J]. 岩石力学与工程学报, 2018, 37(3): 611-620.
SU Fangsheng1，2，PAN Pengzhi1，2，3，GAO Yaohui1，2，FENG Xiating1，3，LIU Chang1，2. Experimental study on failure process and mechanism of marble containing natural hard structural plane. , 2018, 37(3): 611-620.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.1279 或 http://www.rockmech.org/CN/Y2018/V37/I3/611

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