|
|
|
| Study on the evolution characteristics of rock deformation and post-peak energy under different loading methods |
| YANG Xiaobin1，CHENG Hongming1，2，PEI Yanyu1 |
| (1. School of Emergency Management and Safety Engineering，China University of Mining and Technology，Beijing 100083，China；2. School of Coal Engineering，Shanxi Datong University，Datong，Shanxi 037003，China)
|
|
|
|
|
Abstract In order to study on the evolution characteristics of rock deformation and post-peak energy under different loading methods，the triaxial tests with pre-peak unidirectional loading and post-peak cyclic loading，and the triaxial tests with pre-peak and post-peak cyclic loading were carried out with different confining stress. Results showed that at the same pre-peak stress level，the deformation caused by cyclic loading was little smaller than unidirectional loading，meanwhile，the specimens of cyclic loading appeared non-penetrating tiny crack with different lengths and angles，which developed form the end to the main crack，and the angles of main crack were relatively large under the same confining stress. The post-peak stress drop form of two loading methods was similar，while the total energy(W)，the dissipation energy(Wd)，and the frictional dissipation energy(Wf) of specimens during the process of stress drop caused by cyclic loading were smaller than unidirectional loading，and the elastic strain energy were larger. The residual strength stage of two loading methods showed ideal plastic deformation characteristics，and the residual strength was decreased with the increasing number of cycles. The W，the Wd，and the Wf，and the We，and the frictional dissipation energy per unit strain(wf) of rock specimens at residual strength stage of cyclic loading test were larger than unidirectional loading test，and the wf of two loading methods had confining pressure effect.
|
|
|
|
|
|
| [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 rock mechanics in deep ground engineering[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(11)：2 161–2 178.(in Chinese))
[2] 杨小彬，秦跃平，叶 飞. 考虑残余应力的砂岩损伤理论模型[J]. 煤炭学报，2015，40(12)：2 807–2 811.(YANG Xiaobin，QIN Yueping，YE Fei. Damage constitutive relation of sandstone considering residual stress[J]. Journal of China Coal Society，2015，40(12)：2 807– 2 811.(in Chinese))
[3] RUMMEL F，FAIRHURST C. Determination of the post-failure behavior of brittle rock using a servo-controlled testing machine[J]. Rock mechanics，1970，2(4)：189–204.
[4] 陈庆敏，张 农，赵海云，等. 岩石残余强度与变形特性的试验研究[J]. 中国矿业大学学报，1997，26(3)：44–47.(CHENG Qingmin，ZHANG Nong，ZHAO Haiyun，et al. Experimental research on the residual strength and deformation of rock[J]. Journal of China University of Mining and Technology，1997，26(3)：44–47.(in Chinese))
[5] TIWARI R P，RAO K S. Post failure behaviour of a rock mass under the influence of triaxial and true triaxial confinement[J]. Engineering Geology，2006，84(3)：112–129.
[6] ZHANG H J，LI C C. Effects of confining stress on the post-peak behaviour and fracture angle of Fauske marble and iddefjord granite[J]. Rock Mechanics and Rock Engineering，2019，52(5)： 1 377–1 385.
[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] 尤明庆. 岩样三轴压缩的破坏形式和Coulomb强度准则[J]. 地质力学学报，2002，8(2)：179–185.(YOU Mingqing. Destroy character and coulomb criterion of rock specimen in pseudo-triaxial compression[J]. Journal of Geomechanics，2002，8(2)：179–185.(in Chinese))
[9] 王 东，刘长武，王 丁，等. 三向应力下典型岩石破坏预警及峰后特性[J]. 西南交通大学学报，2012，47(1)：90–96.(WANG Dong，LIU Changwu，WANG Ding，et al. Failure prediction and post-failure behavior of typical rock under triaxial compression[J]. Journal of Southwest Jiaotong University，2012，47(1)：90–96.(in Chinese))
[10] 梁运培，李清淼，顾义磊，等. 不同围压下页岩残余强度及破裂面特征的试验研究[J]. 采矿与安全工程学报，2017，34(6)：1 179– 1 185.(LIANG Yunpei，LI Qingmiao，GU Yilei，et al. Experimental study on characteristics of post-peak residual strength and fracture surface of shale under various confining pressures[J]. Journal of Mining and Safety Engineering，2017，34(6)：1 179–1 185.(in Chinese))
[11] HOEK E，BROWN E T. Practical estimates of rock mass strength[J]. International Journal of Rock Mechanics and Mining Sciences，1997，34(8)：1 165–1 186.
[12] 张 帆，盛 谦，朱泽奇，等. 三峡花岗岩峰后力学特性及应变软化模型研究[J]. 岩石力学与工程学报，2008，27(增1)：2 651–2 655. (ZHANG Fan，SHENG Qian，ZHU Zengqi，et al. Study on post-peak mechanical behavior and strain-softening model of Three Gorges granite[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(Supp.1)：2 651–2 655.(in Chinese))
[13] 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))
[14] 程虹铭，乔元栋，董川龙. 基于Hoek-Brown准则的水力压裂瓦斯抽采效果研究[J]. 煤炭科学技术，2018，46(9)：111–116.(CHENG Hongming，QIAO Yuandong，DONG Chuanlong. Study on hydraulic fractured gas drainage effect based on Hoek-Brown Criterion[J]. Coal Science and Technology，2018，46(9)：111–116.(in Chinese))
[15] 张春会，岳宏亮，王来贵，等. 基于脆性模量系数的岩石应变软化及渗透率演化模型[J]. 煤炭学报，2016，41(1)：255–264.(ZHANG Chunhui，YUE Hongliang，WANG Laigui，et al. Strain softening and permeability evolution model based on brittle modulus coefficient[J]. Journal of China Coal Society，2016，41(1)：255–264.(in Chinese))
[16] 于永江，张春会，王来贵. 基于退化角的岩石峰后应变软化模型[J]. 煤炭学报，2012，37(3)：402–406.(YU Yongjiang，ZHANG Chunhui，WANG Laigui. Post-peak strain softening model of rock based on degradation angle[J]. Journal of China Coal Society，2012，37(3)： 402–406.(in Chinese))
[17] 谢 璨，李树忱，平 洋，等. 峰后裂隙岩石非线性损伤特性与数值模拟研究[J]. 岩土力学，2017，38(7)：2 128–2 136.(XIE Can，LI Shuchen，PING Yang，et al. Study of nonlinear damage characteristics and numerical simulation of post-peak fractured rock mass[J]. Rock and Soil Mechanics，2017，38(7)：2 128–2 136.(in Chinese))
[18] 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))
[19] 刘 洋，刘长武，王 东，等. 基于摩擦滑动的峰后断续灰岩力学特性的研究[J]. 煤炭学报，2014，39(2)：301–306.(LIU Yang，LIU Changwu，WANG Dong，et al. Investigation on mechanical behaviors of the post-peak intermittent limestone based on frictional sliding[J]. Journal of China Coal Society，2014，39(2)：301–306.(in Chinese))
[20] 朱珍德，孙林柱，王明洋. 不同频率循环荷载作用下岩石阻尼比试验与变形破坏机制细观分析[J]. 岩土力学，2010，31(增1)：8–12. (ZHU Zhende，SUN Linzhu，WANG Mingyang. Damping ratio experiment and mesomechanical analysis of deformation failure mechanism on rock under different frequency cyclic loadings[J]. Rock and Soil Mechanics，2010，31(Supp.1)：8–12.(in Chinese))
[21] 尤明庆，苏承东，徐 涛. 岩石试样的加载卸载过程及杨氏模量[J]. 岩土工程学报，2001，23(5)：588–592.(YOU Mingqing，SU Chengdong，XU Tao. Loading or unloading process in axial direction and Young’s modulus of rock specimen[J]. Chinese Journal of Geotechnical Engineering，2001，23(5)：588–592.(in Chinese))
[22] 谢和平，彭瑞东，鞠 杨. 岩石变形破坏过程中的能量耗散分析[J].岩石力学与工程学报，2004，23(21)：3 565–3 570.(XIE Heping，PENG Ruidong，JU Yang. Energy dissipation of rock deformation and fracture[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(21)：3 565–3 570.(in Chinese))
[23] 张志镇. 岩石变形破坏过程中的能量演化机制[博士学位论文][D]. 徐州：中国矿业大学，2013.(ZHANG Zhizhen. Energy evolution mechanism during rock deformation and failure[Ph. D. Thesis][D]. Xuzhou：China University of Mining and Technology，2013.(in Chinese))
[24] 杨小彬，程虹铭，吕嘉琦，等. 三轴循环荷载下砂岩损伤耗能比演化特征研究[J]. 岩土力学，2019，40(10)：3 751–3 757.(YANG Xiaobin，CHENG Hongming，Lü Jiaqi，et al. Research on energy consumption ratio evolution law of sandstones under triaxial cyclic loading[J]. Rock and Soil Mechanics，2019，40(10)：3 751–3 757.(in Chinese))
|
|
|
|
2020, Vol. 39 
