低温–动荷载耦合作用下砂岩破坏断口的形貌分析

doi:10.13722/j.cnki.jrme.2017.0514

摘要
图/表
参考文献(20)
相关文章 (15)

全文: PDF (1328 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要利用增加了低温补偿装置的大直径分离式霍普金森压杆(SHPB)系统，进行不同负温等级下的砂岩实时动态抗压试验，而后对试件破坏断口进行电镜扫描观察，分析断口形貌特征，并对提取出的微裂隙进行量化处理，得出红砂岩的动态破坏规律。试验结果表明：冻结岩石的动态抗压强度随应变率的增加而提高，随冻结温度的降低而提高，表现出显著的率强化效应与低温硬化效应；低应变率下，断面以胶结物质断裂、脆性断裂为主要断裂模式，耗能普遍偏低；高应变率下，在前2种断裂模式的基础上断面局部出现韧性破坏特征，耗能等级偏高；提取断面裂隙网络，用图像数字处理的方法对断口的孔隙特征进行分析，得出孔隙数量、平面孔隙度、孔隙形状因子的变化规律；将岩石宏观力学性质与断口微观形貌相结合，并立足于微观尺度分析裂纹扩展规律。研究成果对寒区岩体的理论研究与工程实践具有一定参考意义。

	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
	闻名1
	许金余1
	2
	王浩宇1
	方新宇1
	郑广辉1

关键词 ：岩石力学, 冻岩, 动态抗压强度, 微观结构, SEM图像数字处理

Abstract：

Dynamic mechanical performance experiments are carried out for red-sandstone specimens in different low temperatures under impact loading，by using the f 100 mm split Hopkinson pressure bar(SHPB) with a low temperature compensation device. Then，the scanning electron microscope(SEM) is carried out to study its microcosmic character of failure surface，and dynamic compression failure rules of red sandstone are acquired by the quantitative processing of fracture network. The results indicate that，the peak stress of red sandstone increases with the increase of strain rate，and the peak stress increases with the decrease of temperature. The strengthening effect of strain rate and the hardening effect of low temperature are obvious. In low strain rate，the primary modes of failure surface are cementing material fracture and brittle fracture，with the low energy-consuming. In high strain rate，with the former fracture modes，the surface partially appears ductile damage，while the grade of energy-consuming is pretty high. The quantitatively analysis of fracture network come to the change rules of the pore number，the plane porosity and the pore′s shape factor. With the combination of experimental results and probability theory，the dynamic failure mechanism of frozen rock is illustrated from a new perspective. The research results have important significance to the theoretical study and engineering practice of the rock mass in cold regions.

Key words： rock mechanics frozen rock dynamic compression strength microstructure SEM image digital processing

引用本文:

闻名1，许金余1，2，王浩宇1，方新宇1，郑广辉1. 低温–动荷载耦合作用下砂岩破坏断口的形貌分析[J]. 岩石力学与工程学报, 2017, 36(S2): 3822-3830.
WEN Ming1，XU Jinyu1，2，WANG Haoyu1，FANG Xinyu1，ZHENG Guanghui1. Fractography analysis of sandstone failure under low temperature-dynamic loading coupling effects. , 2017, 36(S2): 3822-3830.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0514 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/3822

[1] 赖远明，张明义，李双洋. 寒区工程理论与应用[M]. 北京：科学出版社，2009：1–12.(LAI Yuanming，ZHANG Mingyi，LI Shuangyang. Cold regions engineering theory and application[M]. Beijing：Science Press，2009：1–12.(in Chinese))

[2] 周幼吾，郭东信，邱国庆，等. 中国冻土[M]. 北京：科学出版社，2008：1–14.(ZHOU Youwu，GUO Dongxin，QIU Guoqing，et al. China permafrost[M]. Beijing：Science Press，2008：1–14.(in Chinese))

[3] 李夕兵，古德生. 岩石冲击动力学[M]. 长沙：中南工业大学出版社，1994：6–12.(LI Xibin，GU Desheng. Rock impact dynamics[M]. Changsha：Zhongnan University of Technology Press，1994：6–12. (in Chinese))

[4] 郝宪杰，冯夏庭，江权，等. 基于电镜扫描实验的柱状节理隧洞卸荷破坏机制研究[J]. 岩石力学与工程学报，2013，32(8)：1 647– 1 654.(HAO Xianjie，FENG Xiating，JIANG Quan，et al. Research on unloading failure mechanism of columnar jointed rock mass in tunnel based on scanning electron microscopy experiments[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(8)：1 647– 1 654.(in Chinese))

[5] 杨更社，张全胜，任建喜，等. 冻结速度对铜川砂岩损伤CT数变化规律研究[J]. 岩石力学与工程学报，2004，23(24)：4 099–4 104. (YANG Gengshe，ZHANG Quansheng，REN Jianxi，et al. Study on the effect of freezing rate on the damage CT values of Tongchuan sandstone[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(24)：4 099–4 104.(in Chinese))

[6] 杨更社，张全胜，蒲毅彬，等. 冻结温度对岩石细观损伤扩展特性影响研究初探[J]. 岩土力学，2004，25(9)：1 409–1 412.(YANG Gengshe，ZHANG Quansheng，PU Yibin，et al. Preliminary study on meso-damage propagation characteristics of rock under condition of freezing temperature[J]. Rock and Soil Mechanics，2004，25(9)：1 409–1 412.(in Chinese))

[7] 杨更社，张全胜，蒲毅彬，等. 冻结温度影响下岩石细观损伤演化CT扫描[J]. 长安大学学报：自然科学版，2004，24(6)：40–46.(YANG Gengshe，ZHANG Quansheng，PU Yibin，et al. CT scanning test of meso-damage propagation of rock under different freezing temperature[J]. Journal of Chang′an University：Natural Science，2004，24(6)：40–46.(in Chinese))

[8] 蔡承政，李根生，黄中伟，等. 液氮冻结条件下岩石孔隙结构损伤试验研究[J]. 岩土力学，2014，35(4)：965–971.(CAI Chengzheng，LI Gensheng，HUANG Zhongwei，et al. Experiment study of rock porous structure damage under cryogenic nitrogen freezing[J]. Rock and Soil Mechanics，2014，35(4)：965–971.(in Chinese))

[9] 左建平，谢和平，周宏伟，等. 温度–拉应力共同作用下砂岩破坏的断口形貌[J]. 岩石力学与工程学报，2007，26(12)：2 444–2 457. (ZUO Jianping，XIE Heping，ZHOU Hongwei，et al. Fractography of sandstone failure under temperature-tensile stress coupling effects[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(12)：2 444–2 457.(in Chinese))

[10] 李夕兵，陶明，宫凤强，等. 冲击载荷作用下硬岩层裂破坏的理论和试验研究[J]. 岩石力学与工程学报，2011，30(6)：1 081–1 088. (LI Xibing，TAO Ming，GONG Fengqiang，et al. Theoretical and experimental study of hard rock spalling fracture under impact dynamic loading[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(6)：1 081–1 088.(in Chinese))

[11] LI X B，LOK T S，ZHAO J. Dynamic characteristics of granite subjected to intermediate loading rate[J]. Rock Mechanics and Rock Engineering，2005，38(1)：21–39.

[12] SHAN R L，JIANG Y S，LI B Q. Obtaining dynamic complete stress-strain curves for rock using the split Hopkinson pressure bar technique[J]. International Journal of Rock Mechanics and Mining Sciences，2000，37(6)：983–992.

[13] ZHANG Y，KARRECH A，SCHAUBS P M，et al. Modelling of deformation around magmatic intrusions with application to gold- related structures in the Yilgarn Craton，Western Australia[J]. Tectonophysics，2012，526/529：133–146.

[14] 刘石，许金余，刘军忠，等. 绢云母石英片岩和砂岩的SHPB试验研究[J]. 岩石力学与工程学报，2011，30(9)：1 864–1 871.(LIU Shi，XU Jinyu，LIU Junzhong，et al. SHPB experimental study of sericite-quartz schist and sandstone[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(9)：1 864–1 871.(in Chinese))

[15] 朱珍德，郭海庆. 裂隙岩体水力学基础[M]. 北京：科学出版社，2007：169–175.(ZHU Zhende，GUO Haiqing. Fractured rock mass hydraulics basis[M]. Beijing：Science Press，2007：169–175.(in Chinese))

[16] JOSEPH W，BERNARO H. A theoretical model of the fracture of rock during freezing[J]. Geological Society of America Bulletin，1985，96(3)：336–346.

[17] GILPIN R R. A model for the prediction of ice leasing and frost heave in soils[J]. Water Resources Research，1980，16(5)：918–930.

[18] 李明. 高温及冲击载荷作用下煤系砂岩损伤破裂机理研究[博士学位论文][D]. 徐州：中国矿业大学，2014：128–129.(LI Ming. Research on rupture mechanisms of coal measures sandstone under high temperature and impact load[Ph. D. Thesis][D]. Xuzhou：China university of mining and technology，2014：128–129.(in Chinese))

[19] 李杰林，周科平，张亚民，等. 基于核磁共振技术的岩石孔隙结构冻融损伤试验研究[J]. 岩石力学与工程学报，2012，31(6)：1 208– 1 214.(LI Jielin，ZHOU Keping，ZHANG Yamin，et al. Experimental study of rock porous structure damage characteristics under condition of freezing-thawing cycles based on nuclear magnetic resonance technique[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(6)：1 208–1 214.(in Chinese))

[20] 朱珍德，张勇，徐卫亚，等. 高围压高水压条件下大理岩断口微观机理分析与试验研究[J]. 岩石力学与工程学报，2005，24(1)：44–51.(ZHU Zhende，ZHANG Yong，XU Weiya，et al. Experimental studies and microcosmic mechanics analysis on marble rupture under high confining pressure and high hydraulic pressure[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(1)：44–51.(in Chinese))