含非共面重叠型微裂隙类岩石试样单轴受压宏细观力学特性颗粒流模拟

doi:10.13722/j.cnki.jrme.2019.0260

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (1115 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要为了研究单轴压缩下非共面重叠型微裂隙倾角变化对类岩石试样整体的轴向应力，弹性应变能和局部应力场等的影响，在已有类岩石试样真实参数基础上选用颗粒流数值分析软件PFC2D对其进行数值模拟。研究结果表明：试样抗压强度随裂隙倾角增加而增加；裂隙倾角较小时，试样在单轴压缩过程中具有明显塑性变形，在应变软化阶段能量释放率较大，而裂隙倾角较大时，则表现出明显的弹脆性性质，贮能较大；对裂隙局部应力场分析，最小主应力场随轴向应变呈明显的阶段性变化，大的应力降均与裂纹的加速扩展有关，按应力场变化特征可归纳为3种不同的类型。加载前期裂隙上下两侧部分区域最小主应力表现为拉应力，随裂隙倾角增大裂隙上下两侧拉应力集中程度减小，受拉区向裂隙尖端转移，并且面积逐渐减小，裂纹启裂后拉应力逐渐消失；加载前期裂隙尖端附近虽然应力集中程度较高，但其二维压应力状态使该区域裂纹启裂相对较难。

	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
	唐礼忠
	宋徉霖

关键词 ：岩石力学, 裂隙岩体, 局部应力, 裂隙倾角, 颗粒流

Abstract：In order to study the effects of non-coplanar overlapping flaw inclination on the axial stress，elastic strain energy and local stress field of rock-like specimens under uniaxial compression，numerical simulation adopting particle flow numerical analysis software PFC2D was carried out based on the actual parameters of existing rock-like samples. The results show that the compressive strength of the rock sample increases with increasing the dip angle of the flaws. When the dip angle of the flaw is small，the sample has obvious plastic deformation during uniaxial compression and the energy release rate is large in the strain softening stage. In the case of a large dip angle of the flaw，the sample shows obvious elastic brittleness and large energy storage capacity. Analysis of the local stress field of the flaws indicates that the minimum principal stress field obviously changes with the axial strain. The large stress drop is related to the accelerating propagation of the cracks. The minimum principal stress filed can be classified into three different types according to the variation of the stress field. In the early stage of loading，the minimum principal stress of the upper and lower sides of the flaws is tension stress. With increasing the dip angle of the flaws，the stress concentration decreases，the tension zone is transferred to the tip of the flaws and the area is gradually reduced. The tensile stress gradually disappears after the flaw is cracked. Although the stress concentration near the tip of the flaw is high in the early stage of loading，the two-dimensional compressive stress state makes the crack initiation of the region relatively difficult.

Key words： rock mechanics fractured rock mass local stress crack angle particle flow

引用本文:

唐礼忠，宋徉霖. 含非共面重叠型微裂隙类岩石试样单轴受压宏细观力学特性颗粒流模拟[J]. 岩石力学与工程学报, 2019, 38(11): 2161-2171.
TANG Lizhong，SONG Yanglin. Particle flow simulation of macro- and meso-mechanical properties of uniaxially compressed rock-like specimens with non-coplanar overlapping flaws. , 2019, 38(11): 2161-2171.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0260 或 http://www.rockmech.org/CN/Y2019/V38/I11/2161

[2]	PARK C H，BOBET A. Crack coalescence in specimens with open and closed flaws：A comparison[J]. International Journal of Rock Mechanics and Mining Sciences，2009，46(5)：819-829.
[4]	WONG L N Y，EINSTEIN H H. Crack coalescence in molded gypsum and carrara marble：Part 1. Macroscopic observations and interpretation[J]. Rock Mechanics and Rock Engineering，2009，42(3)：475-511.
[6]	WONG R H C，CHAU K T. Crack coalescence in a rock-like material containing two cracks[J]. International Journal of Rock Mechanics and Mining Sciences，1998，35(2)：147-164.
[8]	YANG S Q，LIU X R，JING H W. Experimental investigation on fracture coalescence behavior of red sandstone containing two unparallel fissures under uniaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences，2013，63：82-92.
[12]	宋彦琦，李名，王晓，等. 基于高速摄影的双预制裂纹大理岩加卸载试验[J]. 岩石力学与工程学报，2015，34(增1)：2 679-2 689. SONG Yanqi，LI Ming，WANG Xiao，et al. Loading and unloading test of double prefabricated cracked marble based on high-speed photography[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(Supp.1)：2 679-2 689.(in Chinese))
[14]	乐慧琳，孙少锐. 注浆材料和预制裂纹缺陷角度对类岩石试件单轴抗压强度及破坏模式的影响[J]. 岩土力学，2018，39(增1)：211-219.(LE Huilin，SUN Shaorui. Influence of grouting material and prefabricated crack defect angle on uniaxial compressive strength and failure mode of rock-like specimen[J]. Rock and Soil Mechanics，2018，39(Supp.1)：211-219.(in Chinese))
[16]	TANG C A，WONG R H C，CHAU K T，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.
[18]	ZHANG X P，LIU Q，WU S，et al. Crack coalescence between two non-parallel flaws in rock-like material under uniaxial compression[J]. Engineering Geology，2015，199：74-90.
[21]	黄彦华，杨圣奇. 非共面双裂隙红砂岩宏细观力学行为颗粒流模拟[J]. 岩石力学与工程学报，2014，33(8)：1 644-1 653. (HUANG Yanhua，YANG Shengqi. Particle flow simulation of macroscopic and microscopic behavior of non-coplanar double-fissure red sandstone[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(8)：1 644-1 653.(in Chinese))
[22]	CHO N，MARTIN C D，SEGO D C. A clumped particle model for rock[J]. International Journal of Rock Mechanics and Mining Sciences，2007，44(7)：997-1 010.
[1]	BOBET A，EINSTEIN H H. Fracture coalescence in rock-type material under uniaxial and biaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences，1998，35(7)：863-888.
[3]	BOBET A. Fracture Coalescence in rock materials：experimental observations and numerical predictions[M. S. Thesis][D]. Cambridge，Massachusetts：Massachusetts Institute of Technology，1997.
[5]	WONG L N Y，EINSTEIN H H. Systematic evaluation of cracking behavior in specimens containing single flaws under uniaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences，2009，46(2)：239-249.
[7]	LEE H，JEON S. An experimental and numerical study of fracture coalescence in pre-cracked specimens under uniaxial compression[J]. International Journal of Solids and Structures，2011，48(6)：979-999.
[9]	AFOLAGBOYE L O，HE J，WANG S. Experimental study on cracking behavior of moulded gypsum containing two non-parallel overlapping flaws under uniaxial compression[J]. Acta Mechanica Sinica，2017，33(2)：394-405.
[10]	李德行，王恩元，李楠，等. 单轴压缩下宏观裂纹倾角对煤体特性影响研究[J]. 岩石力学与工程学报，2017，36(增1)：3 206-3 213. (LI Dexing，WANG Enyuan，LI Nan，et al. Influence of macroscopic crack inclination on coal mass characteristics under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(Supp.1)：3 206-3 213.(in Chinese))
[11]	朱振飞，陈国庆，肖宏跃，等. 基于声发射多参量分析的岩桥裂纹扩展研究[J]. 岩石力学与工程学报，2018，37(4)：909-918.(ZHU Zhenfei，CHEN Guoqing，XIAO Hongyue，et al. Study on crack growth of rock bridge based on acoustic emission multi-parameter analysis[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(4)：909-918.(in Chinese))
[13]	宋彦琦，李名，王晓，等. 基于高速摄影的单预制裂纹大理岩加卸载试验[J]. 中国矿业大学学报，2014，43(5)：773-781.(SONG Yanqi，LI Ming，WANG Xiao，et al. Loading and unloading test of single- crack marble based on high-speed photography[J]. Journal of China University of Mining and Technology，2014，43(5)：773-781.(in Chinese))
[15]	TANG C. Numerical simulation of progressive rock failure and associated seismicity[J]. International Journal of Rock Mechanics and Mining Sciences，1997，34(2)：249-261.
[17]	BOBET A，EINSTEIN H H. Numerical modeling of fracture coalescence in a model rock material[J]. International Journal of Fracture，1998，92(3)：221-252.
[19]	ZHANG X P，WONG L N Y. Cracking processes in rock-like material containing a single flaw under uniaxial compression：A numerical study based on parallel bonded-particle model approach[J]. Rock Mechanics and Rock Engineering，2012，45(5)：711-737.
[20]	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. Discrete element numerical analysis of the evolution mechanism of rock cracks with double fractures[J]. Rock and Soil Mechanics，2014，35(11)：3 259-3 268.(in Chinese))