基于应变局部化的双裂纹岩样贯通模式及强度试验研究

doi:10.13722/j.cnki.jrme.2015.0857

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (918 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要含裂隙岩体在外力作用下，内部裂纹会发生扩展，这会显著影响强度以及损伤特性。基于前期验证可靠的DIC系统，对含双裂纹的类岩石材料进行单轴压缩试验，捕获全过程的应变场演化云图以及岩桥区域应变局部化过程，研究发现：岩样呈现出显著的变形局部化渐进破坏特性；试验初期形成的应变局部化带基本确定了加载全程全局应变场的变化范围与变化趋势；基于试验研究，双裂纹岩样的贯通破坏模式可归总为4类：岩桥不贯通模式、裂纹内尖端贯通模式、裂纹内外尖端贯通模式以及裂纹外尖端贯通模式；岩桥角度及其空间排布在细观上影响了应变场局部化带的演化过程，宏观上决定了裂纹的扩展路径及岩样的破坏模式；岩桥贯通时应变局部化带的融合造成了应力–应变曲线的“峰前波动”，使得岩样强度降低，并且融合越慢岩样强度越高。

	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

关键词 ：岩石力学, 岩桥, 双裂纹, 应变局部化, 数字图像技术

Abstract：Cracks in rock will initiate，propagate and coalesce under loading，which remarkably influences the strength and damage property of rock. Based on a DIC system which was proved reliable，uniaxial compression experiments were carried out on the specimens with two precast flaws. The strain field and strain localization of the whole specimen were obtained. It was found that the strain localization and the progressive damage were very distinctive in the test. The strain localization zone appeared in the initial phase governed the range and trend of the whole process of the strain field development. There were four failure modes found in the test，that is the non-coalescence mode，the coalescence mode at inner tip of flaws，the coalescence mode at outer tip of fracture and the inner-outer tip coalescence mode. The bridge angle and the arrangements of flaws had the effect on the formation of strain localization zone in mesoscopic level and determined the cracking path and the failure mode in macroscopic level. The coalescence of strain localization zone in the bridge area resulted in a fluctuation of stress-strain curve before the peak and reduced the peak strength. The slower the coalescence of the strain localization zones，the higher the peak strength.

Key words： rock mechanics rock bridge double flaws strain localization digital image technology

引用本文:

赵程1，2，鲍冲1，田加深1，松田浩3，森田千寻3. 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): 2309-2318.
ZHAO Cheng1，2，BAO Chong1，TIAN Jiashen1，MATSUDA Hiroshi3，MORITA Chihiro3. EXPERIMENTAL STUDY OF COALESCENCE MODE OF CRACKS AND STRENGTH OF ROCK WITH DOUBLE FLAWS BASED ON STRAIN LOCALIZATION. , 2015, 34(11): 2309-2318.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2015.0857 或 http://www.rockmech.org/CN/Y2015/V34/I11/2309

[2]	张志强，李宁，陈方方，等. 非贯通裂隙岩体破坏模式研究现状与思考[J]. 岩土力学，2009，30(增2)：142-148.(ZHANG Zhiqiang，LI Ning，CHEN Fangfang，et al. Review and status of research on failure mode of nonpenetrative fractured rock mass[J]. Rock and Soil Mechanics，2009，30(Supp.2)：142-148.(in Chinese)) " target="_blank">
[3]	REYES O，EINSTEIN H H. Failure mechanisms of fractured rock—A fracture coalescence model[C]// Proceedings of the 7th International Congress on Rock Mechanics. Aachen，Germany：[s. n.]，1991：333-340. " target="_blank">
[1]	BIENIAWSKI Z T. Mechanism of brittle fracture of rock：part I—theory of the fracture process[J]// International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1967，4(4)：395-406. " target="_blank">
[5]	朱维申，陈卫忠，申晋. 雁形裂纹扩展的模型试验及断裂力学机制研究[J]. 固体力学学报，1998，19(4)：354-360.(ZHU Weishen，CHEN Weizhong，SHEN Jin. Simulation experiment and fracture mechanism study on propagation of echelon pattern cracks[J]. Acta Mechanica Solida Sinica，1998，19(4)：354-360.(in Chinses)) " target="_blank">
[6]	WONG R H C. Failure mechanisms and peak strengths of natural rocks and rock-like solids containing frictional cracks[Ph. D. Thesis][D]. Hong Kong：Hong Kong Polytechnic University，1997. " target="_blank">
[7]	WONG R H C，CHAU K T. The coalescence of frictional cracks and the the shear zone formation in brittle solids under compressive stresses[J]. International Journal of Rock Mechanics and Mining Sciences，1997，34(3)：335. e1-335. e12. " target="_blank">
[8]	张平，李宁，贺若兰，等. 动载下两条断续预制裂隙贯通机制研究[J]. 岩石力学与工程学报，2006，25(6)：1 210-1 217.(ZHANG Ping，LI Ning，HE Ruolan，et al. Mechanism of fracture coalescence between two pre-existing flaws under dynamic loading[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(6)：1 210- 1 217.(in Chinese)) " target="_blank">
[10]	YANG S Q，YANG D S，JING H W，et al. An experimental study of the fracture coalescence behaviour of brittle sandstone specimens containing three fissures[J]. Rock Mechanics and Rock Engineering，2012，45(4)：563-582.
[11]	黄凯珠，林鹏，唐春安，等. 双轴加载下断续预制纹贯通机制的研究[J]. 岩石力学与工程学报，2002，21(6)：808-816.(ROBINA H C，LIN Peng，TANG Chun?an，et al. Mechanisms of crack coalescence of pre-existing flaws under biaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2002，21(6)：808-816.(in Chinese)) " target="_blank">
[13]	蒲成志，曹平，赵延林，等. 单轴压缩下多裂隙类岩石材料强度试验与数值分析[J]. 岩土力学，2010，31(11)：3 661-3 666.(PU Chengzhi，CAO Ping，ZHAO Yanlin，et al. Numerical analysis and strength experiment of rock-like materials with multi-fissures under uniaxial compression[J]. Rock and Soil Mechanics，2010，31(11)： 3 661-3 666.(in Chinese)) " target="_blank">
[14]	SAGONG M，BOBET A. Coalescence of multiple flaws in a rock-model material in uniaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences，2002，39(2)：229-241.
[15]	黄明利，唐春安，梁正召. 岩石裂纹相互作用的应力场分析[J]. 东北大学学报：自然科学版，2001，22(4)：446-449.(HUANG Mingli，TANG Chun?an，LIANG Zhengchao. Stress field analysis of interaction of rock cracks[J]. Journal of Northeastern University：Natural Science，2001，22(4)：446-449.(in Chinese)) " target="_blank">
[4]	BOBET A，EINSTEIN H H. Fracture coalescence in rock-type materials under uniaxial and biaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences，1998，35(7)：863-888. " target="_blank">
[9]	TANG C A，LIN P，WONG R，et al. Analysis of crack coalescence in rock-like materials containing three flaws—part I：experimental approach[J]. International Journal of Rock Mechanics and Mining Sciences，2001，38(7)：909-924. " target="_blank">
[16]	黎立云，许凤光，高峰，等. 岩桥贯通机制的断裂力学分析[J]. 岩石力学与工程学报，2005，24(23)：4 328-4 334.(LI Liyun，XU Fengguang，GAO Feng，et al. Fracture mechanics analysis of rock bridge failure mechanism[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(23)：4 328-4 334.(in Chinese)) " target="_blank">
[19]	蒋明镜，陈贺，张宁，等. 含双裂隙岩石裂纹演化机制的离散元数值分析[J]. 岩土力学，2014，35(11)：3 259-3 268.(JIANG Mingjing，CHEN He，ZHANG Ning，et al. Distinct element numerical analysis of crack evolution in rocks containing pre-existing double flaw[J]. Rock and Soil Mechanics，2014，35(11)：3 259-3 268.(in Chinese)) " target="_blank">
[20]	蒲成志，曹平，衣永亮. 单轴压缩下预制2条贯通裂隙类岩材料断裂行为[J]. 中南大学学报：自然科学版，2012，43(7)：2 708- 2 716.(PU Chengzhi，CAO Ping，YI Yongliang. Fracture for rock-like materials with two transfixion fissures under uniaxial compression[J]. Journal of Central South University：Science and Technology，2012，43(7)：2 708-2 716.(in Chinese)) " target="_blank">
[22]	赵程，田加深，松田浩，等. 单轴压缩下基于全局应变场分析的岩石裂纹扩展及其损伤演化特性研究[J]. 岩石力学与工程学报，2015，34(4)：763-769.(ZHAO Cheng，TIAN Jiashen，MATSUDA Hiroshi，et al. Crack propagation and damage of rock under uniaxial compression based on global strain field analysis[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(4)：763-769.(in Chinese))
[23]	赵程，鲍冲，松田浩，等. 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，MATSUDA Hiroshi，et al. Application of digital image correlation method in experimental research on crack propagation of brittle rock[J]. Chinese Journal of Geotechnical Engineering，2015，37(5)：944-951.(in Chinese))
[12]	LIN P，WONG R H C，CHAU K T，et al. Multi-crack coalesence in rock-like material under uniaxial and biaxial loading[J]. Key Engineering Materials，2000，183(1)：809-814. " target="_blank">
[18]	TANG C A，LIN P，WONG R H C，et al. Analysis of crack coalescence in rock-like materials containing three flaws—part II：numerical approach[J]. International Journal of Rock Mechanics and Mining Sciences，2001，38(7)：925-939. " target="_blank">
[21]	ZHAO C，MATSUDA H，MORITA C，et al. Study on failure characteristic of rock-like materials with an open-hole under uniaxial compression[J]. Strain，2011，47(5)：405-413.
[17]	黄明利，唐春安，朱万成. 岩石破裂过程的数值模拟研究[J]. 岩石力学与工程学报，2000，19(4)：468-471.(HUANG Mingli，TANG Chun?an，ZHU Wancheng. Numerical simulation on failure process of rock[J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(4)：468-471.(in Chinese))