|
|
|
| Experimental mechanical properties of damaged and fractured rock samples#br# |
| MENG Qingbin1，2，QIAN Wei1，PU Hai1，HUANG Bingxiang2，WANG Congkai1，SUN Wei1，WANG Jie1#br# |
| (1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；2. State Key Laboratory of Coal Resources and Safe Mining，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China) |
|
|
|
Abstract The state of surrounding rock faced in the development of deep mineral resources is essentially different from that of shallow roadways. The fracture degree of the surrounding rock in deep roadways is more serious，and the mechanical properties of the fractured rock are quite different from the intact rock. To investigate the mechanical behaviors of damaged and fractured rock，a preparation method of damaged and fractured rock samples by triaxial test through simultaneously unloading axial and confining pressures was proposed，and an apparent damage and fracture variable taking into account the degradation of the elastic modulus and the influence of the plastic deformation was defined for describing the damage fracture behaviors of rocks. The MTS 815 rock mechanics test system was used to carry out triaxial unloading tests at 8 unloading points including pre-peak，peak，post-peak and residual，and rock samples with different damage and fracture degrees were obtained. Through the triaxial compression test of damaged and fractured rock samples，the relationships between the peak stress，strength and deformation parameters and dilatancy characteristics with the confining pressure and the damage fracture degree were revealed. The test results show that the stress-strain curve of the triaxial reload test of rock samples with different damage and fracture levels still has 5 stages of the conventional triaxial compression test of intact rock samples. However，the curve of post-peak softening section of rock samples with a high damage and fracture degree is gradually gentle，showing certain plastic deformation characteristics. The peak stress，strength and deformation parameters of rock samples are positively correlated with the confining pressure，and the confining pressure has a significant inhibitory effect on the volume expansion of rock samples. As the damage and fracture degree of the rock sample increases，the reloaded rock sample after unloading is more likely to expand，the peak stress and the elastic modulus of the rock sample will decrease，while the generalized Poisson¢s ratio will increase.
|
|
|
|
|
|
[1] 谢和平，高 峰，鞠 杨. 深部岩体力学研究与探索[J]. 岩石力学与工程学报，2015，34(11)：2 161–2 178.(XIE Heping，GAO Feng，JU Yang. Research and development of mechanics in deep ground engineering[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(11)：2 161–2 178.(in Chinese))
[2] 何满潮，谢和平，彭苏萍，等. 深部开采岩体力学研究[J]. 岩石力学与工程学报，2005，24(16)：2 803–2 813.(HE Manchao，XIE Heping，PENG Suping，et al. Study on rock mechanics in deep mining engineering[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(16)：2 803–2 813.(in Chinese))
[3] 康红普，王国法，姜鹏飞，等. 煤矿千米深井围岩控制及智能开采技术构想[J]. 煤炭学报，2018，43(7)：1 789–1 800.(KANG Hongpu，WANG Guofa，JIANG Pengfei，et al. Conception for strata control and intelligent mining technology in deep coal mines with depth more than 1000 m[J]. Journal of China Coal Society，2018，43(7)：1 789–1 800.(in Chinese))
[4] 刘泉声，卢兴利. 煤矿深部巷道破裂围岩非线性大变形及支护对策[J]. 岩土力学，2010，31(10)：3 273–3 279.(LIU Quansheng，LU Xingli. Research on nonlinear large deformation and support measures for broken surrounding rocks of deep coal mine roadway[J]. Rock and Soil Mechanics，2010，31(10)：3 273–3 279.(in Chinese))
[5] 韩立军，贺永年，蒋斌松，等. 环向有效约束条件下破裂岩体承载变形特性分析[J]. 中国矿业大学学报，2009，38(1)：14–19.(HAN Lijun，HE Yongnian，JIANG Binsong，et al. An analysis of the deformation characteristics of a cracked rock mass under load when cylindrically constrained[J]. Journal of China University of Mining and Technology，2009，38(1)：14–19.(in Chinese))
[6] 贺永年，韩立军，邵 鹏，等. 深部巷道稳定的若干岩石力学问题[J]. 中国矿业大学学报，2006，35(3)：288–295.(HE Yongnian，HAN Lijun，SHAO Peng，et al. Some problems of rock mechanics for roadways stability in depth[J]. Journal of China University of Mining and Technology，2006，35(3)：288–295.(in Chinese))
[7] TUTLUOGLU L，OGE I F，KARPUZ C. Relationship between pre-failure and post-failure mechanical properties of rock material of different origin[J]. Rock Mechanics and Rock Engineering，2015，48(1)：121–141.
[8] 周宏伟，谢和平，左建平. 深部高地应力下岩石力学行为研究进展[J]. 力学进展，2005，35(1)：91–99.(ZHOU Hongwei，XIE Heping，ZUO Jianping. Developments in researches on mechanical behaviors of rocks under the condition of high ground pressure in the depths[J]. Advances In Mechanics，2005，35(1)：91–99.(in Chinese))
[9] SONG S B，LIU J F，YANG D S，et al. Pore structure characterization and permeability prediction of coal samples based on SEM images[J]. Journal of Natural Gas Science and Engineering，2019，67(7)：160–171.
[10] HUDSON J A，CROUCH S L，FAIRHURST C. Soft，stiff and servo- controlled testing machines：a review with reference to rock failure[J]. Engineering Geology，1972，6(3)：155–189.
[11] 靖洪文. 峰后岩石剪胀性能试验研究[J]. 岩土力学，2003，24(1)：93–102.(JING Hongwen. Experimental study on dilatancy nature of the rock post - peak behavior[J]. Rock and Soil Mechanics，2003，24(1)：93–102.(in Chinese))
[12] 靖洪文，苏海健，杨大林，等. 损伤岩样强度衰减规律及其尺寸效应研究[J]. 岩石力学与工程学报，2012，31(3)：543–549.(JING Hongwen，SU Haijian，YANG Dalin，et al. Study of strength degradation law of damaged rock sample and its size effect[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(3)：543–549.(in Chinese))
[13] 葛修润，周百海. 对岩石峰值后区特性的新见解[J]. 中国矿业，1992，1(2)：57–60.(GE Xiurun，ZHOU Baihai. A new understanding of post - failure behaviour of rock[J]. China Mining Magazine，1992，1(2)：57–60.(in Chinese))
[14] 朱建明，徐秉业，岑章志. 岩石类材料峰后滑移剪膨变形特征研究[J]. 力学与实践，2001，23(5)：19–22.(ZHU Jianming，XU Bingye，CEN Zhangzhi. Study on the deformation mechanisms of sliding dilation of post failure rocks[J]. Mechanics in Engineering，2001，23(5)：19–22.(in Chinese))
[15] HAN L J，YANG M J. Re-fracture process and mechanical characteristics of cracked rock samples[J]. International Journal of Rock Mechanics and Mining Sciences，2009，46(4)：738–747.
[16] 徐松林，吴 文，王广印，等. 大理岩等围压三轴压缩全过程研究I：三轴压缩全过程和峰前、峰后的卸围压全过程实验[J]. 岩石力学与工程学报，2001，20(6)：763–767.(XU Songlin，WU Wen，WANG Guanyin，et al. Study on complete procedures of marble under triaxial compression I：Testing study on complete procedure of triaxial compression and the processes of unloading confining at the pre-peak and post-peak[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(6)：763–767.(in Chinese))
[17] 李 磊，孙中光. 砂岩峰后应变卸载围压摩擦滑动分析[J]. 煤矿安全，2019，50(8)：189–193.(LI Lei，SUN Zhongguang. Post-peak friction sliding of sandstone under unloading confining pressure[J]. Safety in Coal Mines，2019，50(8)：189–193.(in Chinese))
[18] 李林峰，杨相如. 岩石峰后应力应变特性的加卸载试验研究[J]. 公路，2011，(5)：131–136.(LI Lingfeng，YANG Xiangru. Experiment and study on stress and strain properties of rock after peak strength under loading and unloading[J]. Highway，2011，(5)：131–136.(in Chinese))
[19] MAHMUTOGLU Y，VARDAR M. Effects of inelastic volume increase on fraetured rock behavior[J]. Bulletin of Engineering Geology and the Environmen，2003，62(2)：117–121.
[20] 牛双建，靖洪文，杨旭旭，等. 深部巷道破裂围岩强度衰减规律试验研究[J]. 岩石力学与工程学报，2012，31(8)：1 587–1 596.(NIU Shuangjian，JING Hongwen，YANG Xuxu，et al. Experimental study of strength degradation law of surrounding rock in fractured zone of deep roadway[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(8)：1 587–1 596.(in Chinese))
[21] 李文婷，李树忱，冯现大，等. 莫尔–库仑准则的岩石峰后应变软化力学行为研究[J]. 岩石力学与工程学报，2011，30(7)：1 460–1 466. (LI Wenting，LI Shuchen，FENG Xianda，et al. Study of post - peak strain softening mechanical properties of rock based on Mohr-Coulomb criterion[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(7)：1 460–1 466.(in Chinese))
[22] 陆银龙，王连国，杨 峰，等. 软弱岩石峰后应变软化力学特性研究[J]. 岩石力学与工程学报，2010，29(3)：640–648.(LU Yinlong，WANG Lianguo，YANG Feng，et al. Post-peak strain softening mechanical properties of weak rock[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(3)：640–648.(in Chinese))
[23] 中华人民共和国国家标准编写组. GB/T 23561－2010 煤和岩石物理力学性质测定方法[S]. 北京：中国标准出版社，2010.(The National Standards Compilation Group of People’s Republic of China. GB/T 23561－2010 Methods for determining the physical and mechanical properties of coal and rock[S]. Beijing：Standards Press of China，2010.(in Chinese))
[24] MARTIN C D，CHANDLER N A. The progressive fracture of Lac du Bonnet granite[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1994，31(6)：643–659.
[25] 沈明荣，陈建峰. 岩体力学[M]. 上海：同济大学出版社，2006：14–31.(SHEN Mingrong，CHEN Jianfeng. Rock mechanics[M]. Shanghai：Tongji University press，2006：14–31.(in Chinese))
[26] 杨圣奇，苏承东，徐卫亚. 大理岩常规三轴压缩下强度和变形特性的试验研究[J]. 岩土力学，2005，26(3)：475–478.(YANG Shengqi，SU Chengdong，XU Weiya. Experimental investigation on strength and deformation properties of marble under conventional triaxial compression[J]. Rock and Soil Mechanics，2005，26(3)：475–478.(in Chinese))
[27] LEMAITRE J，DUFAILLY J. Damage measurement[J]. Engineering Fracture Mechanics，1987，28(5)：643–661.
[28] 鞠 杨，谢和平. 应变等效性假说的损伤定义的适用条件[J]. 应用力学学报，1998，15(1)：43–49.(JU Yang，XIE Heping. A variable condition of the damage description based on hypothesis of strain equivalence[J]. Chinese Journal of Applied Mechanics，1998，15(1)：43–49.(in Chinese))
[29] MENG Q B，ZHANG M W，HAN L J，et al. Acoustic emission characteristics of red sandstone specimens under uniaxial cyclic loading and unloading compression[J]. Rock Mechanics and Rock Engineering，2018，51(4)：969–988.
[30] MARTIN C D. Seventeenth canadian geotechnical colloquium：The effect of cohesion loss and stress path on brittle rock strength[J]. Canadian Geotechnical Journal，1997，34(5)：698–725.
[31] PALCHIK V. Application of Mohr-Coulomb failure theory to very porous sandy shales[J]. International Journal of Rock Mechanics and Mining Sciences，2006，43(7)：1 153–1 162.
[32] 尤明庆. 岩石试样的杨氏模量与围压的关系[J]. 岩石力学与工程学报，2003，22(1)：53–60.(YOU Mingqing. Effcet of confining pressure on the Yong's modulus of rock specimen[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(1)：53–60.(in Chinese))
[33] 贺永年，韩立军，王衍森. 岩石力学简明教程学[M]. 徐州：中国矿业大学出版社，2010：23–28.(HE Yongnian，HAN Lijun，WANG Yansen. Simple tutorial on rock mechanics[M]. Xuzhou：China University of Mining and Technology Press，2010：23–28.(in Chinese))
|
|
|
|
2020, Vol. 39 
