断续裂隙类岩石材料三轴压缩力学特性试验研究

黄彦华; 杨圣奇; 鞠杨; 周小平; 高峰

doi:10.11779/CJGE201607007

断续裂隙类岩石材料三轴压缩力学特性试验研究 English Version

基金项目: 江苏省杰出青年基金项目（BK20150005）；国家自然科学基金面上项目（41272344）； 2014江苏省双创团队项目

详细信息

作者简介:
黄彦华（1989- ）,男,福建龙岩人,博士研究生,主要从事断续裂隙岩石力学特性及地下工程稳定控制方面的研究工作。E-mail: huangyh1219@163.com。

计量
- 文章访问数: 618
- HTML全文浏览量: 6
- PDF下载量: 557
出版历程
- 收稿日期: 2015-06-24
- 发布日期: 2016-07-24

Experimental study on mechanical behavior of rock-like materials containing pre-existing intermittent fissures under triaxial compression

1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China;
2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China;
3. School of Civil Engineering, Chongqing University, Chongqing 400045, China

摘要

摘要: 研究三向应力作用下裂隙对岩石力学特性的影响对于确保裂隙岩体工程稳定具有重要的实践意义。通过配制含两条不平行张开贯穿型裂隙类砂岩试样,采用MTS815.02岩石力学伺服试验机进行不同围压下常规三轴压缩试验。基于试验结果,详细分析了完整及断续不平行双裂隙类岩石材料的应力-应变曲线、强度和变形参数以及破裂模式。研究结果表明：①断续裂隙岩样应力-应变曲线呈现多台阶式软化,部分曲线出现双峰值现象; ②完整及断续裂隙岩样峰值强度、裂纹损伤阈值和峰值应变均随着围压的增大呈线性增大。完整岩样峰值强度对围压的敏感程度最高,而断续裂隙岩样中由倾角45°,30°和60°依次减小; ③断续裂隙岩样宏观破裂模式受裂隙倾角和围压的共同作用。当围压较小时,破裂形态受裂隙倾角的影响较大; 当围压增大到一定程度后,裂隙倾角的影响逐渐减弱,围压的作用开始显现,岩样最终呈剪切破坏模式。
- 岩石力学 /
- 不平行双裂隙 /
- 强度特征 /
- 破裂模式 /
- 围压
Abstract: It is of important practical significance for ensuring the stability of fractured rock engineering to investigate the influence of pre-existing fissures on the mechanical behavior of rock under three-dimensional stress. The rock-like material specimens containing two unparallel open penetrating fissures are fabricated in the laboratory. And then a series of conventional triaxial compressive tests on rock-like material specimens are carried out by using the MTS815.02 rock mechanics servo-controlled testing system. On the basis of experimental results, the stress-strain curves, strength and deformation parameters and failure modes are analyzed. The main conclusions are drawn as follows: (1) The stress-strain curves of pre-fissured specimens show multi-step softening, and some curves have two peak strengths; (2) The peak strength, crack damage threshold and peak axial strain of intact and pre-fissured specimens all increase linearly with the increase of confining pressure. The sensitivity to the confining pressure of intact specimen is the highest, and the sensitivity of pre-fissured specimens decreases from fissure angle 45° to 30° and then to 60°; (3) The failure modes of pre-fissured specimens are determined by the fissure angle and confining pressure. When the confining pressure is smaller, it is mainly affected by the fissure angle. Whereas the confining pressure is higher, which is mainly influenced by the confining pressure, and the rock specimens exhibit a shear mode.
- rock mechanics /
- two unparallel fissures /
- strength property /
- failure mode /
- confining pressure

HTML全文

参考文献(26)

[1]	陈新, 李东威, 王莉贤, 等. 单轴压缩下节理间距和倾角对岩体模拟试件强度和变形的影响研究[J]. 岩土工程学报, 2014, 36(12): 2236-2245. (CHEN Xin, LI Dong-wei, WANG Li-xian, et al. Experimental study on effect of spacing and inclination angle of joints on strength and deformation properties of rock masses under uniaxial compression[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(12): 2236-2245. (in Chinese))
[2]	刘红岩, 黄妤诗, 李楷兵, 等. 预制节理岩体试件强度及破坏模式的试验研究[J]. 岩土力学, 2013, 34(5): 1235-1241. (LIU Hong-yan, HUANG Yu-shi, LI Kai-bing, et al. Test study of strength and failure mode of pre-existing jointed rock mass[J]. Rock and Soil Mechanics, 2013, 34(5): 1235-1241. (in Chinese))
[3]	张平, 李宁, 贺若兰, 等. 不同应变率下非贯通裂隙介质的力学特性分析[J]. 岩土工程学报, 2006, 28(6): 750-755. (ZHANG Ping, LI Ning, HE Ruo-lan, et al. Mechanical properties of fractured media containing intermittent fractures at different strain rates[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(6): 750-755. (in Chinese))
[4]	席婧仪, 陈忠辉, 朱帝杰, 等. 岩石不等长裂纹应力强度因子及起裂规律研究[J]. 岩土工程学报, 2015, 37(4): 727-733. (XI Jing-yi, CHEN Zhong-hui, ZHU Di-jie, et al. Stress intensity factors and initiation of unequal collinear cracks in rock[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(4): 727-733. (in Chinese))
[5]	YIN P, WONG R H C, CHAU K T. Coalescence of two parallel pre-existing surface cracks in granite[J]. International Journal of Rock Mechanics and Mining Sciences, 2014, 68: 66-84.
[6]	黄凯珠, 林鹏, 唐春安, 等. 双轴加载下断续预置裂纹贯通机制的研究[J]. 岩石力学与工程学报, 2002, 21(6): 808-816. (WONG Robina H C, LIN Peng, TANG Chun-an, et al. Mechanism 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))
[7]	肖桃李, 李新平, 贾善坡. 深部单裂隙岩体结构面效应的三轴试验研究与力学分析[J]. 岩石力学与工程学报, 2012, 31(8): 1666-1673. (XIAO Tao-li, LI Xin-ping, JIA Shan-po. Triaxial test research and mechanical analysis based on structure surface effect of deep rock mass with single fissure[J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(8): 1666-1673. (in Chinese))
[8]	肖桃李, 李新平, 贾善坡. 两条断续贯通的预制裂隙岩样破坏特性的三轴压缩试验研究[J]. 岩石力学与工程学报, 2015. doi:10.13722/j.cnki.jrme.2014.1443. (XIAO Tao-li, LI Xin-ping, JIA Shan-po. Triaxial test research of failure characteristic with two pre-existing transfixion cracks[J]. Chinese Journal of Rock Mechanics and Engineering, 2015. doi:10.13722/j.cnki.jrme.2014. 1443. (in Chinese))
[9]	YANG S Q, JIANG Y Z, XU W Y, et al. Experimental investigation on strength and failure behavior of pre-cracked marble under conventional triaxial compression[J]. International Journal of Solids and Structures, 2008, 45(17): 4796-4819.
[10]	杨圣奇, 刘相如.不同围压下断续预制裂隙大理岩扩容特性试验研究[J]. 岩土工程学报, 2012, 34(12): 2188-2197. (YANG Sheng-qi, LIU Xiang-ru. Experimental investigation on dilatancy behavior of marble with pre-existing fissures under different confining pressures[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(12): 2188-2197. (in Chinese))
[11]	LIU J, ZHU Z, WANG B. The fracture characteristic of three collinear cracks under true triaxial compression[J]. The Scientific World Journal, 2014. DOI:org/10.1155/2014/ 459025.
[12]	HUANG D, GU D, YANG C, et al. Investigation on mechanical behaviors of sandstone with two preexisting flaws under triaxial compression[J]. Rock Mechanics and Rock Engineering, 2016, 49(2): 375-399.
[13]	WANG S Y, SLOAN S W, SHENG D C, et al. Numerical study of failure behaviour of pre-cracked rock specimens under conventional triaxial compression[J]. International Journal of Solids and Structures, 2014, 51(5): 1132-1148.
[14]	MANOUCHEHRIAN A, SHARIFZADEH M, MARJI M F, et al. A bonded particle model for analysis of the flaw orientation effect on crack propagation mechanism in brittle materials under compression[J]. Archives of Civil and Mechanical Engineering, 2014, 14(1): 40-52.
[15]	方前程, 周科平, 刘学服. 不同围压下断续节理岩体破坏机制的颗粒流分析[J]. 中南大学学报 (自然科学版), 2014, 45(10): 3536-3543. (FANG Qian-cheng, ZHOU Ke-ping, LIU Xue-fu. Failure mechanism of discontinuous joint rock mass under different confining pressures based on particle flow code[J]. Journal of Central South University (Science and Technology), 2014, 45(10): 3536-3543. (in Chinese))
[16]	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): 1644-1653. (HUANG Yan-hua, YANG Sheng-qi. Particle flow simulation of macro-and meso-mechanical behavior of red sandstone containing two pre-existing non-coplanar fissures[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(8): 1644-1653. (in Chinese))
[17]	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.
[18]	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.
[19]	HAERI H, SHAHRIAR K, MARJI M F, et al. Experimental and numerical study of crack propagation and coalescence in pre-cracked rock-like disks[J]. International Journal of Rock Mechanics and Mining Sciences, 2014, 67: 20-28.
[20]	蒋明镜, 陈贺, 张宁, 等. 含双裂隙岩石裂纹演化机理的离散元数值分析[J]. 岩土力学, 2014, 35(11): 3259-3268. (JIANG Ming-jing, 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): 3259-3268. (in Chinese))
[21]	张社荣, 孙博, 王超, 等. 双轴压缩试验下岩石裂纹扩展的离散元分析[J]. 岩石力学与工程学报, 2013, 32(增刊2): 3083-3091. (ZHANG She-rong, SUN Bo, WANG Chao, et al. Discrete element analysis of crack propagation in rocks under biaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(S2): 3083-3091. (in Chinese))
[22]	HUANG Y H, YANG S Q, TIAN W L, et al. An experimental study on fracture mechanical behavior of rock-like materials containing two unparallel fissures under uniaxial compression[J]. Acta Mechanica Sinica, 2015, doi:10.1007/s10409-015-0489-3, in press.
[23]	ZHUANG X, CHUN J, ZHU H. A comparative study on unfilled and filled crack propagation for rock-like brittle material[J]. Theoretical and Applied Fracture Mechanics, 2014, 72: 110-120.
[24]	李树忱, 汪雷, 李术才, 等. 不同倾角贯穿节理类岩石试件峰后变形破坏试验研究[J]. 岩石力学与工程学报, 2013, 32(增刊2): 3391-3395. (LI Shu-chen, WANG Lei, LI Shu-cai, et al. Post-peak deformation and failure experimental study of rock-like specimens with different inclination angles persistent joints[J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(S2): 3391-3395. (in Chinese))
[25]	杨圣奇, 温森, 李良权. 不同围压下断续预制裂纹粗晶大理岩变形和强度特性的试验研究[J]. 岩石力学与工程学报, 2007, 26(8): 1572-1587. (YANG Sheng-qi, WEN Sen, LI Liang-quan. Experimental study on deformation and strength properties of coarse marble with discontinuous pre-existing cracks under different confining pressures[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(8): 1572-1587. (in Chinese))
[26]	WASANTHA P L P, RANJITH P G. Water-weakening behavior of Hawkesbury sandstone in brittle regime[J]. Engineering Geology, 2014, 178: 91-101.