Experimental study on impact dynamic characteristics of layered composite rocks
YANG Renshu1，2，LI Weiyu1，3，FANG Shizheng1，3，ZHU Ye1，3，LI Yongliang1，3
(1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；2. Civil and Resource Engineering School，University of Science and Technology Beijing，
Beijing 100083，China；3. School of Mechanics and Architecture Engineering，China University of
Mining and Technology(Beijing)，Beijing 100083，China)
Abstract：In order to explore the dynamic mechanical properties of layered composite rocks which are common in rock engineering，layered composite rock samples spliced by red and gray sandstones were prepared. Impact compression tests in two cases of gray sandstone and red sandstone near the incident bar at different impact velocities were carried out using split Hopkinson pressure bar(SHPB) test system，and the stress wave propagation characteristics，dynamic stress-strain relationship and energy dissipation law of composite rock mass in two cases were studied and compared. The stress characteristics and strength conditions of composite rock mass were analyzed theoretically，and the failure characteristics of composite rock mass were studied by using ultra-high speed digital image correlation(DIC) test system. The results show that the dynamic mechanical properties and energy dissipation laws of composite rock mass have obvious strain rate effect. At the same impact velocity， the dynamic characteristics of composite rock mass in the case of the stress wave propagating from the hard to the soft are obviously different from those in the case of the stress wave propagating from the soft to the hard due to the matching relationship of the wave impedance. However，the difference gradually decreases and tends to be zero with increasing the impact velocity. It is also shown that the failure degree and failure form of the two parts of composite rock are obviously different. The damage degree of the red sandstone with relatively small wave impedance is more severe than that of the gray sandstone. The red sandstone mainly shows shear failure，and the failure of the part at the boundary layer legs other regions. For the gray sandstone，tensile failure is dominant and local shear failure occurs at a high impact velocity，and the part at the boundary layer fails earlier than other regions.
[1] 鲜学福，谭学术. 层状岩体破坏机理[M]. 重庆：重庆大学出版社，1989：63–66.(XIAN Xuefu，TAN Xueshu. Failure mechanism of layered rock mass[M]. Chongqing：Chongqing University Press，1989：63–66.(in Chinese))
[2] TIEN Y M，KUO M C. A failure criterion for transversely isotropic rocks[J]. International Journal of Rock Mechanics and Mining Sciences，2001，35(3)：399–412.
[3] SAEIDI O，RASOULI V，VANEGHI R G，et al. A modified failure criterion for transversely isotropic rocks[J]. Geoscience Frontiers，2014，5(2)：215–225.
[4] AYDAN T A，KAWAMOTO T. The squeezing potential of rocks around tunnels[J]. Rock Mechanics and Rock Engineering，1993，26(2)：137–163.
[5] JAEGER J C. Shear failure of anistropic rocks[J]. Geological Magazine，1960，97(1)：65–72.
[6] 李 昂，邵国建，范华林，等. 基于细观层次的软硬互层状复合岩体力学特性研究[J]. 岩石力学与工程学报，2014，33(增1)：3 042–3 049.(LI Ang，SHAO Guojian，FAN Hualin，et al. Investigation of mechanical properties of soft and hard interbedded composite rock mass based on meso-level heterogeneity[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(Supp.1)：3 042–3 049.(in Chinese))
[7] 姚 囝，叶义成，王其虎，等. 缓倾斜层状岩体单轴压缩力学行为的颗粒流数值模拟[J]. 工程地质学报，2018，26(4)：835–843.(YAO Nan，YE Yicheng，WANG Qihu，et al. Particle flow code numerical simulation of uniaxial compression mechanical behavior of gently inclined layered rock[J]. Journal of Engineering Geology，2018，26(4)：835–843.(in Chinese))
[8] TIEN Y M，KUO M C，JUANG C H. An experimental investigation of the failure mechanism of simulated transversely isotropic rocks[J]. International Journal of Rock Mechanics and Mining Sciences，2006，43(8)：1 163–1 181.
[9] 王兵武，李银平，杨春和，等. 界面倾角对复合层状物理模型材料力学特性的影响研究[J]. 岩土力学，2015，36(增2)：139–147. (WANG Binwu，LI Yinping，YANG Chunhe，et al. Influences of interface inclination on mechanical properties of composite bedded physical model material[J]. Rock and Soil Mechanics，2015，36(Supp.2)：139–147.(in Chinese))
[10] 腾俊洋，唐建新，王进博，等. 层状复合岩体损伤演化规律及分形特征[J]. 岩石力学与工程学报，2018，37(增1)：3 263–3 278.(TENG Junyang，TANG Jianxin，WANG Jinbo，et al. The evolution law of the damage of bedded composite rock and its fractal characteristics[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(Supp.1)：3 263–3 278.(in Chinese))
[11] 周 辉，宋 明，张传庆，等. 水平层状复合岩体变形破坏特征的围压效应研究[J]. 岩土力学，2019，40(2)：465–473.(ZHOU Hui，SONG Ming，ZHANG Chuan-qing，et al. Effect of confining pressure on mechanical properties of horizontal layered composite rock[J]. Rock and Soil Mechanics，2019，40(2)：465–473.(in Chinese))
[12] 刘 立，朱文喜，路军富，等. 层状岩体损伤演化与应变关系的研究[J]. 岩石力学与工程学报，2005，25(2)：350–354.(LIU Li，ZHU Wenxi，LU Junfu，et al. Research on relation between damage evolution and strain of stratified rock[J]. Chinese Journal of Rock Mechanics and Engineering，2005，25(2)：350–354.(in Chinese))
[13] 尹光志，李 星，鲁 俊，等. 真三轴应力条件下层状复合岩石破坏准则[J]. 岩石力学与工程学报，2017，36(2)：261–269.(YIN Guangzhi，LI Xing，LU Jun，et al. A failure criterion for layered composite rock under true triaxial stress conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(2)：261–269.(in Chinese))
[14] 李夕兵，陈寿如. 应力波在层状矿岩结构中传播的新算法[J]. 中南矿冶学院学报，1994，24(6)：738–742.(LI Xibing，CHEN Shouru. New algorithm of stress wave spreading in layer rock structure[J]. Midsouth Mining and Metallurgy Insitute，1994，24(6)：738–742.(in Chinese))
[15] DAI F，HUANG S，XIA K，et al. Some fundamental issues in dynamic compression and tension tests of rocks using split Hopkinson pressure bar[J]. Rock Mechanics and Rock Engineering，2010，43(6)：657–666.
[16] 潘 兵，吴大方，夏 勇. 数字图像相关方法中散斑图的质量评价研究[J]. 实验力学，2010，25(2)：120–129.(PAN Bing，WU Dafang，XIA Yong. Study of speckle pattern quality assessment used in digital image correlation[J]. Journal of Experimental Mechanics，2010，25(2)：120–129.(in Chinese))
[17] LI D，HAN Z，ZHU Q，et al. Stress wave propagation and dynamic behavior of red sandstone with single bonded planar joint at various angles[J]. International Journal of Rock Mechanics and Mining Sciences，2019，117：162–170.
[18] 岳中文，宋 耀，陈 彪，等. 冲击载荷下层状岩体动态断裂行为的模拟试验研究[J]. 振动与冲击，2017，36(12)：223–229.(YUE Zhongwen，SONG Yao，CHEN Biao，et al. A study on the behaviors of dynamic fracture in layered rocks under impact loading[J]. Journal of Vibration and Shock，2017，36(12)：223–229.(in Chinese))
[19] 王 斌，李夕兵，尹土兵，等. 饱水砂岩动态强度的SHPB试验研究[J]. 岩石力学与工程学报，2010，29(5)：1 003–1 009.(WANG Bin，LI Xibing，YIN Tubing，et al. Split Hopkinson pressure bar(SHPB) experiments on dynamic strength of water-saturated sandstone[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(5)：1 003–1 009.(in Chinese))
[20] 朱晶晶，李夕兵，宫凤强，等. 冲击荷载下砂岩的动力学特性及损伤规律[J]. 中南大学学报：自然科学版，2012，43(7)：2 701–2 707. (ZHU Jingjing，LI Xibing，GONG Fengqiang，et al. Experimental test and damage characteristics of sandstone under uniaxial impact compressive loads[J]. Journal of Central South University：Science and Technology，2012，43(7)：2 701–2 707.(in Chinese))
[21] 夏昌敬，谢和平，鞠 杨，等. 冲击荷载下孔隙岩石能量耗散的实验研究[J]. 工程力学，2006，23(9)：1–5.(XIA Changjing，XIE Heping，JU Yang，et al. Experimental study of energy dissipation of porous rock under impact loading[J]. Engineering Mechanics，2006，23(9)：1–5.(in Chinese))
[22] 许金余，刘 石. 大理石冲击加载试验碎块的分形特征分析[J]. 岩土力学，2012，33(11)：3 225–3 229.(XU Jinyu，LIU Shi. Research on fractal characteristics of marble fragments subjected to impact loading[J]. Rock and Soil Mechanics，2012，33(11)：3 225–3 229.(in Chinese))
[23] 平 琦，马芹永，袁 璞. 岩石试件SHPB劈裂拉伸试验中能量耗散分析[J]. 采矿与安全工程学报，2013，30(3)：401–407.(PING Qi，MA Qinyong，YUAN Pu. Energy dissipation analysis of stone specimens in SHPB tensile test[J]. Journal of Mining and Safety Engineering，2013，30(3)：401–407.(in Chinese))
[24] 杨小林. 炸药岩石阻抗匹配与爆炸应力、块度的试验研究[J]. 煤炭学报，1991，16(1)：89–95.(YANG Xiaolin. Study of blasting stress，size and matched impedance between explosive and rock[J]. Journal of China Coal Society，1991，16(1)：89–95.(in Chinese))
[25] 钮 强，熊代余. 炸药岩石波阻抗匹配的试验研究[J]. 有色金属，1988，40(4)：13–17.(NIU Qiang，XIONG Daiyu. Experimental study on wave impedance matching of explosive and rock[J]. Nonferrous Metals，1988，40(4)：13–17.(in Chinese))
2019, Vol. 38 
