基于单轴压缩的岩体破坏机制细观试验研究

doi:10.13722/j.cnki.jrme.2016.0808

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (1070 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要岩石在荷载作用下产生宏观破坏，其断裂面的细观形态变化，可以间接地反映岩石内部损伤演化进程，并与其宏观力学状态和结构破坏特性之间存在必然联系。主要对巴西劈裂试验和剪切试验试样的断裂面进行电镜扫描，总结典型力学特征下试样断裂面的细观形貌特征，建立裂纹断裂面细观形貌与宏观力学特性匹配的判断标准。进而对含不同倾角预制单裂纹试样单轴压缩试样的破坏全断面进行细观扫描分析，采用判断标准对其细观形貌判别，得到断裂面的拉剪应力分布权重，探究断裂面拉、剪应力分布随裂纹扩展过程的变化规律。试验结果表明：全断面拉剪应力权重与预制裂纹倾角有密切关系。预制裂纹倾角小于45°时，断裂面以拉应力为主，且随着裂纹扩展拉应力权重逐渐减小，剪应力权重逐渐增大；当裂纹倾角大于45°时，其结论与前述结论相反；预制裂纹倾角为45°时，拉、剪应力共同作用产生翼裂纹及次生裂纹2种扩展方式，翼裂纹扩展由拉应力主导向剪切应力主导过渡，次生裂纹扩展过程中主导应力变化规律与之相反。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	赵程1
	2
	于志敏1
	2
	王文东1
	2
	松田浩3
	森田千寻3

关键词 ：岩石力学, 细观机制, 电镜扫描, 细观形貌标准, 裂纹形态

Abstract：The evolution of microscopic fabric of rock has an important effect on its mechanical property and failure shape and it is therefore essential to study the microscopic fabric on rock. In this study，the scanning electron microscope(SEM) was used to scan the micro structure of the failure section of samples after compression shear test and Brazil split test. The morphological characteristics of the fracture surface of specimen were highlighted and the criteria of microscopic morphology matching macroscopic mechanical properties of crack surface were established. Meanwhile，the whole failure section of manufactured pre-crack was scanned with different angles of inclination. The criteria was applied to distinguish their microscopic morphology. As a result，the ratio of tensile-shear stresses on the fracture surface was obtained. The variation of the ratio in the cracking propagation process was studied. The results show that the ratio of tensile-shear stresses is closely related to the dip angle of the pre-existing crack. When the inclination angle is less than 45°，the tensile stress on the fracture surface is high，and the ratio decreases with the crack angle increasing. When the inclination angle is more than 45°，the results are opposite to the former. When the inclination angle is 45°，there are two macroscopic cracks owing to the combined effect of tensile and shear stresses. The proportion of wing cracks tensile stress changes from high to low during crack propagation process，and the results of secondary crack are converse to the former.

Key words： rock mechanics microscopic mechanism electron microscope scanning method criteria of micro-morphology crack shapes

引用本文:

赵程1，2，于志敏1，2，王文东1，2，松田浩3，森田千寻3. 基于单轴压缩的岩体破坏机制细观试验研究[J]. 岩石力学与工程学报, 2016, 35(12): 2490-2498.
ZHAO Cheng1，2，YU Zhimin1，2，WANG Wendong1，2，MATSUDA Hiroshi3，MORITA Chihiro3. Meso-experimental study of failure mechanism of rock based on uniaxial compression test. , 2016, 35(12): 2490-2498.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.0808 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/I12/2490

[1]	李先炜，兰勇瑞. 岩石断口分析[J]. 中国矿业学院学报，1983，(1)：15-21.(LI Xianwei，LAN Yongrui. A study of rock fractures[J]. Journal of China University of Mining and Technology，1983，(1)：15-21.(in Chinese)) " target="_blank">
[2]	谢和平，陈至达. 岩石断裂的微观机理分析[J]. 煤炭学报，1989，(2)：57-67.(XIE Heping，CHEN Zhida. Analysis of rock fracture micro-mechanism[J]. Journal of China Coal Society，1989，(2)：57-67.(in Chinese))
[3]	刘小明，李焯芬. 岩石断口微观断裂机制分析与实验研究[J]. 岩石力学与工程学报，1997，16(6)：509-513.(LIU Xiaoming，LI Zhuofen. Micro failure mechanism analysis and test study for rock failure surface[J]. Chinese Journal of Rock Mechanics and Engineering. 1997，16(6)：509-513.(in Chinese))
[4]	冯涛，谢学斌. 岩爆岩石断裂机制的电镜分析[J]. 中南工业大学学报，1999，30(1)：14-17.(FENG Tao，XIE Xuebing. Fracture mechanism analysis for burst rock with election scanning microscope[J]. Journal of Central South University of Technology，1999，30(1)：14-17.(in Chinese))
[5]	谢海峰，饶秋华，王志. 反平面剪切(III型)加载下脆性岩石的断口分析[J]. 岩石力学与工程学报，2007，26(9)：1 832-1 839.(XIE Haifeng，RAO Qiuhua，WANG Zhi. Fracture morphology analysis of brittle rock under anti-plane shear(mode III)loading[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(9)：1 832-1 839.(in Chinese))
[6]	赵小平，左建平，裴建良. 锦屏层状大理岩断裂机制的细观试验研究[J]. 岩石力学与工程学报，2012，31(3)：534-542.(ZHAO Xiaoping，ZUO Jianping，PEI Jianliang. Meso-experiment study of fracture mechanism of bedded marble in Jingping[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(3)：534-542.(in Chinese))
[7]	杨仁树，王雁冰. 切缝药包爆破岩石爆生裂纹断面的SEM试验[J].中国矿业大学学报，2013，42(3)：337-341.(YANG Renshu，WANG Yanbing. SEM experiment of rock crack cross section morphology after explosion fracturing with slotted cartridge[J]. Journal of China University of Mining and Technology，2013，42(3)：337-341.(in Chinese))
[8]	赵程，鲍冲. 数字图像技术在节理岩体裂纹扩展试验中的应用研究[J]. 岩土工程学报，2015，37(5)：944-951.(ZHAO Cheng，BAO Chong. Application of digital image correlation method in experimental research crack propagation of brittle rock[J]. Chinese Journal of Geotechnical Engineering，2015，37(5)：944-951.(in Chinese))
[9]	卢应发，张梅英，葛修润. 大理岩静态和循环荷载试件的电镜分析[J]. 岩土力学，1990，11(4)：75-80.(LU Yingfa，ZHANG Meiying，GE Xiurun. Election-microscopic analysis on marble specimens of static and cyclic loading tests[J]. Rock and Soil Mechanics，1990，11(4)：75-80.(in Chinese))
[10]	凌建明. 压缩荷载条件下岩石细观损伤特性的研究[J]. 同济大学学报：自然科学版，1993，21(2)：219-226.(LIN Jianmin. Study on the mesoscopical characteristics of rock damage under compressive loading[J]. Journal of Tongji University：Natural Science，1993，21(2)：219-226.(in Chinese))
[11]	赵永红，黄杰藩，侯建军，等. 岩石细观破裂的实验观测研究及其对了解地震活动的启示[J]. 地球物理学报，1995，38(5)：627-635.(ZHAO Yonghong，HUANG Jiefan，HOU Jianjun，et al. Experimental study of meso-fractures in rock and its implication for understanding seismic activities[J]. Acta Geophysica Sinica，1995，38(5)：627-635.(in Chinese))
[12]	WU X Y，WONG B P. Micromechanics of compressive failure and spatial evolution of anisotropic damage in Darley dale sandstone Teng-fong[J]. International Journal of Rock Mechanics and Mining Sciences，2000，37(1)：143-160. " target="_blank">
[13]	李炼，徐钺，李启光，等. 花岗岩板渐进破坏过程的微观研究[J]. 岩石力学与工程学报，2002，21(7)：940-947.(LI Lian，XU Yue，LI Qiguang，et al. Progressive cracking of granite plate under uniaxial compression[J]. Chinese Journal of Rock and Engineering，2002，21(7)：940-947.(in Chinese))
[14]	马少鹏，刘善军，赵永红. 岩石破坏过程中试件表面应变场演化特征研究[J]. 岩石力学与工程学报，2006，25(3)：590-595.(MA Shaopeng，LIU Shanjun，ZHAO Yonghong. Gray correlation of digital images from loaded rock specimen surface to evaluate its damage evolution[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(3)：590-595.(in Chinese))
[15]	朱珍德，黄强，王剑波，等. 岩石变形劣化全过程细观试验与细观损伤力学模型研究[J]. 岩石力学与工程学报，2013，32(6)：1 167-1 175.(ZHU Zhende，HUANG Qiang，WANG Jianbo，et al. Mesoscopic experiment on degradation evolution of rock deformation and its meso-damage mechanical mode[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(6)：1 167-1 175.(in Chinese))
[16]	赵程，鲍冲，田加深，等. 基于应变局部化的双裂纹岩样贯通模式及强度试验研究[J]. 岩石力学与工程学报，2015，34(11)：2 309-2 318.(ZHAO Cheng，BAO Chong，TIAN Jiashen，et al. Experimental study of coalescence mode of cracks and strength of rock with double flaws based on strain localization[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(11)：2 309-2 318.(in Chinese))