|
|
|
| Dynamic photoelastic experimental study on the influence of joint contact area ratio on stress wave propagation |
| WANG Siwei1，2，LI Jianchun1，2 |
| (1. Engineering Research Center of Safety and Protection of Explosion and Impact of Ministry of Education，Southeast University，Nanjing，Jiangsu 211189，China；2. Institute of Future Underground Space，Southeast University，Nanjing，Jiangsu 211189，China) |
|
|
|
|
Abstract The presence of rock joints significantly affects not only the propagation of stress waves but also the safety of underground engineering. The purpose of this study is to non-destructively observe the stress concentration around the joints and the characteristics of stress wave propagation. The test on specimens consisting of two contacted polycarbonate plates with an artificial joint was carried out using a modified Split Hopkinson Pressure Bar(SHPB) and a photoelastic equipment. In order to reduce the wave impedance of loading bars，the input and output bars of SHPB equipment were made of polycarbonate materials. The dynamic photoelastic experiment figures and propagation characteristics of the stress wave were studied according to the theory of viscoelastic wave propagation and the concept of energy flow density. Then，the relationship between the energy flow density of the transmission wave and the stress concentration near the joints with different contact area ratios and joint distribution forms was analyzed. The test results show that with decreasing the contact area ratio，the stress wave transmission coefficient decreases while the energy flow density of the transmission wave as well as the stress concentration near the joints increases. When the contact area ratio remains constant，the more dispersed the joints，the greater the stress wave transmission coefficient. In this case，the energy flow density of the transmitted wave increases while the stress concentration near the joints attenuates. Under a dynamic load，the stress concentration phenomenon appears near the joints，and the energy flow density of the transmission wave is closely related to the stress concentration near the joints.
|
|
|
|
|
|
[1] LI J C，MA G W，ZHAO J. An equivalent viscoelastic model for rock mass with parallel joints[J]. Journal of Geophysical Research：Solid Earth，2010；115：B03305.
[2] MA G，FAN L F，LI J. Evaluation of equivalent medium methods for stress wave propagation in jointed rock mass[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2013，37(7)：701–715.
[3] MINDLIN R D. Waves and vibrations in isotropic，elastic plates[J]. Structure Mechanics，1960：199–232.
[4] BANDIS S C，LUMSDEN A C，BARTON N R. Fundamentals of rock joint deformation[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1983，20(6)：249–268.
[5] ZHAO J，CAI J G. Transmission of elastic P-waves across single fractures with a nonlinear normal deformational behavior[J]. Rock Mechanics and Rock Engineering，2001，34(1)：3–22.
[6] FAN L F，WANG L J，WU Z J. Wave transmission across linearly jointed complex rock masses[J]. International Journal of Rock Mechanics and Mining Sciences，2018，112：193–200.
[7] 赵 坚. 岩石节理吻合系数及其对节理特性的影响[J]. 岩石力学与工程学报，1997，16(6)：514–521.(ZHAO Jian. Joint match coefficient and effects to behavior of rock joint[J]. Chinese Journal of Rock Mechanics and Engineering，1997，16(6)：514–521.(in Chinese))
[8] 谢和平，周宏伟. 基于分形理论的岩石节理力学行为研究[J]. 中国科学基金，1998，(4)：17–22.(XIE Heping，ZHOU Hongwei. Research on mechanical behaviors of rock joints based on fractal theory[J]. Bulletin of National Science Foundation of China，1998，(4)：17–22.(in Chinese))
[9] 鞠 杨，李业学，谢和平，等. 节理岩石的应力波动与能量耗散[J].岩石力学与工程学报，2006，25(12)：2 426–2 434.(JU Yang，LIYexue，XIE Heping，et al. Stress wave propagation and energy dissipation in jointed rocks[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(12)：2 426–2 434.(in Chinese))
[10] LI J C，MA G W. Experimental study of stress wave propagation across a filled rock joint[J]. International Journal of Rock Mechanics and Mining Sciences，2009，46(3)：471–478.
[11] LI J，MA G，HUANG X. Analysis of wave propagation through a filled rock joint[J]. Rock Mechanics and Rock Engineering，2010，43(6)：789–798.
[12] 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)：1 235–1 241.(LIU Hongyan，HUANG Yushi，LI Kaibing，et al. Test study of strength and failure mode of pre-existing jointed rock mass[J]. Rock and Soil Mechanics，2013，34(5)：1 235–1 241. (in Chinese))
[13] 杨 阳，杨仁树，王建国. 节理厚度对岩石动力特性影响的模拟试验[J]. 中国矿业大学学报，2016，45(2)：211–216.(YANG Yang，YANG Renshu，WANG Jianguo. Simulation material experiment on dynamic mechanical properties of jointed rock affected by joint thickness[J]. Journal of China University of Mining and Technology，2016，45(2)：211–216.(in Chinese))
[14] 杨仁树，王茂源，杨 阳，等. 充填材料对节理岩石动力学性能影响的模拟试验[J]. 振动与冲击，2016，35(12)：125–131.(YANG Renshu，WANG Maoyuan，YANG Yang，et al. Simulation material experiment on the dynamic mechanical properties of jointed rock affected by joint-filling material[J]. Journal of Vibration and Shock，2016，35(12)：125–131.(in Chinese))
[15] HAO H，WU Y，MA G，et al. Characteristics of surface ground motions induced by blasts in jointed rock mass[J]. Soil Dynamics and Earthquake Engineering，2001，21(2)：85–98.
[16] HAIBO L，XIANG X，JIANCHUN L，et al. Rock damage control in bedrock blasting excavation for a nuclear power plant[J]. International Journal of Rock Mechanics and Mining Sciences，2011，48(2)：210﹣218.
[17] 陈 昕，李建春，任奋华，等. JMC对应力波透射系数和节理比刚度影响的实验研究[J]. 岩石力学与工程学报，2016，35(5)：957–963.(CHEN Xin，LI Jianchun，REN Fenhua，et al. Experimental research of JMC effect on stress wave propagation and joint specific stiffness[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(5)：957–963.(in Chinese))
[18] 李娜娜，李建春，李海波，等. 节理接触面对应力波传播影响的SHPB试验研究[J]. 岩石力学与工程学报，2015，34(10)：1 994–2 000.(LI Nana，LI Jianchun，LI Haibo，et al. SHPB Experiment on influence of contact area of joints on propagation of stress wave[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(10)：1 994–2 000.(in Chinese))
[19] 戎立帆，李建春，李海波，等. 基于能量法测量节理岩体品质因子的实验研究[J]. 岩石力学与工程学报，2017，36(10)：2 474–2 483. (RONG Lifan，LI Jianchun，LI Haibo，et al. Measurement of seismic quality factor of jointed rock based on stress wave energy[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(10)：2 474– 2 483.(in Chinese))
[20] 岳中文，宋 耀，王 煦，等. 不同倾角预制裂纹缺陷与运动裂纹的相互作用[J]. 爆炸与冲击，2017，37(1)：162–168.(YUE Zhongwen，SONG Yao，WANG Xu，et al. Interaction between a pre-existing crack defect with different angles and a running crack[J]. Explosion and Shock Waves，2017，37(1)：162–168.(in Chinese))
[21] XIA K W，CHALIVENDRA V B，ROSAKIS A J. Spontaneous mixed-mode fracture in bonded similar and dissimilar materials[J]. Experimental Mechanics，2006，46(2)：163–171.
[22] XIA K W，CHALIVENDRA V B，ROSAKIS A J. Observing ideal “self-similar” crack growth in experiments[J]. Engineering Fracture Mechanics，2006，73(18)：2 748–2 755.
[23] JU Y，WANG L，XIE H，et al. Visualization and transparentization of the structure and stress field of aggregated geomaterials through 3D printing and photoelastic techniques[J]. Rock Mechanics and Rock Engineering，2017，50(6)：1 383–1 407.
[24] JU Y，REN Z，MAO L，et al. Quantitative visualisation of the continuous whole-field stress evolution in complex pore structures using photoelastic testing and 3D printing methods[J]. Optics Express，2018，26(5)：6 182–6 201.
[25] BACON C. An experimental method for considering dispersion and attenuation in a viscoelastic Hopkinson bar[J]. Experimental mechanics，1998，38(4)：242–249.
[26] YOUNIS N T. Assembly stress for the reduction of stress concentration[J]. Mechanics Research Communications，2006，33(6)： 837–845.
[27] ZOU Y，LI J，LALOUI L，et al. Analytical time-domain solution of plane wave propagation across a viscoelastic rock joint[J]. Rock Mechanics and Rock Engineering，2017，50(10)：2 731–2 747.
[28] CHEN X，LI J C，CAI M F，et al. Experimental study on wave propagation across a rock joint with rough surface[J]. Rock Mechanics and Rock Engineering，2015，48(6)：2 225–2 234. |
|
|
|
2021, Vol. 40 
