频繁动力扰动对围压卸载中高储能岩体的动力学影响
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摘要
基于冬瓜山铜矿深部巷道围岩开挖过程中面临的高应力和频繁爆破扰动问题,利用改进的SHPB动静组合加载系统,开展了频繁动力扰动对围压卸载中高储能岩体动力学影响的研究。研究结果表明,围压卸载中的矽卡岩受到动力扰动时,其动态峰值应力和弹性模量随动力扰动次数非线性变化。围压卸载中的高储能矽卡岩受到动力扰动时会释放能量。轴压促使岩样内微裂隙轴向发育,造成岩样抵抗动力扰动能力减弱;围压减缓岩样内微裂隙轴向发育,造成岩样抵抗动力扰动能力增强。动力扰动对微裂隙扩展有促进作用,使围压卸载中的岩样由拉伸破坏向剪切破坏转变。
In this study, based on the high stress and frequent blast disturbance in the process of surrounding rock excavation in the deep roadway of Dongguashan Copper Mine, we investigated the dynamic properties of the high-energy rock mass disturbed by frequent dynamic loading during confining pressure unloading,using the modified SHPB coupled static-dynamic loading system. The results show that the peak dynamic stress and elastic modulus of the skarn subjected to confining pressure unloading varied nonlinearly with the number of dynamic disturbances, and the high energy skarn in confining pressure unloading released energy when subjected to dynamic disturbance. The axial pressure promoted the axial development of micro-fissures in the rock specimens, resulting in a lower capacity of rock samples. However, the confining pressure restrained the axial development of micro-fissures in the rock sample, resulting in a higher capacity of rock samples. The dynamic disturbance promoted the micro-fracture expansion, transforming the rock sample in confining pressure from tensile failure to shear failure.
In this study, based on the high stress and frequent blast disturbance in the process of surrounding rock excavation in the deep roadway of Dongguashan Copper Mine, we investigated the dynamic properties of the high-energy rock mass disturbed by frequent dynamic loading during confining pressure unloading,using the modified SHPB coupled static-dynamic loading system. The results show that the peak dynamic stress and elastic modulus of the skarn subjected to confining pressure unloading varied nonlinearly with the number of dynamic disturbances, and the high energy skarn in confining pressure unloading released energy when subjected to dynamic disturbance. The axial pressure promoted the axial development of micro-fissures in the rock specimens, resulting in a lower capacity of rock samples. However, the confining pressure restrained the axial development of micro-fissures in the rock sample, resulting in a higher capacity of rock samples. The dynamic disturbance promoted the micro-fracture expansion, transforming the rock sample in confining pressure from tensile failure to shear failure.
引文
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[14]邱加冬,李地元,李夕兵,等.预制缺陷对花岗岩层裂破坏的影响[J].爆炸与冲击,2018,38(3):665-670.DOI:10.11883/bzycj-2016-0310.QIU Jiadong,LI Diyuan,LI Xibing,et al.Effect of pre-existing flaws on spalling fracture of granite[J].Explosion and Shock Waves,2018,38(3):665-670.DOI:10.11883/bzycj-2016-0310.
[15]周磊,朱哲明,董玉清,等.冲击加载下巷道内裂纹的扩展特性及破坏行为[J].爆炸与冲击,2018,38(4):785-794.DOI:10.11883/bzycj-2016-0383.ZHOU Lei,ZHU Zheming,DONG Yuqing,et al.Propagation characteristics and failure behaviors of crack in tunnel under impact loads[J].Explosion and Shock Waves,2018,38(4):785-794.DOI:10.11883/bzycj-2016-0383.
[16]李夕兵,周子龙,叶州元,等.岩石动静组合加载力学特性研究[J].岩石力学与工程学报,2008,27(7):1387-1395.LI Xibing,ZHOU Zilong,YE Zhouyuan,et al.Study on mechanical properties of rock static and dynamic loading[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(7):1387-1395.
[17]LI Xibing,ZHOU Zilong,LOK Tatseng,et al.Innovative testing technique of rock subjected to coupled static and dynamic loads[J].International Journal of Rock Mechanics and Mining Sciences,2008,45(5):739-748.
[18]LI X B,LOK T S,ZHAO J,et al.Oscillation elimination in the Hopkinson bar apparatus and resultant complete dynamic stress-strain curves for rocks[J].International Journal of Rock Mechanics and Mining Sciences,2000,37(7):1055-1060.
[19]李夕兵.岩石动力学基础与应用[M].北京:科学出版社,2014:20-21.
[2]钱七虎.非线性岩石力学的新进展:深部岩体力学的若干问题[C]//中国岩石力学与工程学会.第八次全国岩石力学与工程学术大会论文集.北京:科学出版社,2004:10-17.
[3]左宇军,李夕兵,张义平,等.动-静组合加载诱发岩爆时岩块弹射速度的计算[J].中南大学学报(自然科学版),2006,37(4):815-819.ZUO Yujun,LI Xibing,ZHANG Yiping,et al.Calculation of ejection velocity of rock in rockburst caused by static-dynamic coupling loading[J].Journal of Central South University(Science and Technology),2006,37(4):815-819.
[4]ZUO Yujun,LI Xibing,ZHOU Zilong.Determination of ejection velocity of rock fragments during rock burst in consideration of damage[J].Journal of Central South University of Technology,2005,12(5):618-622.
[5]DIEDERICHS M S,KAISER P K,EBERHARDT E.Damage initiation and propagation in hard rock during tunneling and the influence of near-face stress rotation[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(5):785-812.
[6]XIA K,NASSERI M H B,MOHANTY B,et al.Effects of microstructures on dynamic compression of Barre granite[J].International Journal of Rock Mechanics and Mining Sciences,2008,45(6):879-887.
[7]唐礼忠,舒计步,武建力,等.高静应力和频繁动力扰动共同作用下矽卡岩动力学特性[J].北京科技大学学报,2014,36(8):993-999.TANG Lizhong,SHU Jibu,WU Jianli,et al.Dynamic characteristics of skarn under high static stress and frequent dynamic disturbances[J].Journal of University of Science and Technology Beijing,2014,36(8):993-999.
[8]唐礼忠,王春,程露萍,等.一维静载及循环冲击共同作用下矽卡岩力学特性试验研究[J].中南大学学报(自然科学版),2015,46(10):3898-3906.TANG Lizhong,WANG Chun,CHENG Luping,et al.Experimental research on mechanical properties of skarn under onedimensional static loading and cyclic impact[J].Journal of Central South University(Science and Technology),2015,46(10):3898-3906.
[9]王春,唐礼忠,程露萍,等.三维高静载频繁动态扰动时岩石损伤特性及本构模型[J].岩土力学,2017,38(8):2286-2296;2305.WANG Chun,TANG Lizhong,CHENG Luping,et al.Damage characteristics and constitutive model of rocks subjected to three-dimensional high dynamic static disturbance[J].Rock and Soil Mechanics,2017,38(8):2286-2296;2305.
[10]ZHAO J,ZHAO X B,CAI J G.A further study of P-wave attenuation across parallel fractures with linear deformational behaviour[J].International Journal of Rock Mechanics and Mining Sciences,2006,43(5):776-788.
[11]殷志强,李夕兵,尹土兵,等.高应力岩石围压卸载后动力扰动的临界破坏特性[J].岩石力学与工程学报,2012,31(7):1355-1362.YIN Zhiqiang,LI Xibing,YIN Tubing,et al.Critical failure characteristics of dynamic disturbance after unloading of high stress rock confining pressure[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(7):1355-1362.
[12]殷志强,李夕兵,金解放,等.围压卸载速度对岩石动力强度与破碎特性的影响[J].岩土工程学报,2011,33(8):1296-1301.YIN Zhiqiang,LI Xibing,JIN Jiefang,et al.Influence of confining pressure unloading speed on rock strength and fracture characteristics[J].Chinese Journal of Geotechnical Engineering,2011,33(8):1296-1301.
[13]金解放,李夕兵,殷志强,等.轴压和围压对循环冲击下砂岩能量耗散的影响[J].岩土力学,2013,34(11):3096-3102;3109.JIN Jiefang,LI Xibing,YIN Zhiqiang,et al.Effect of axial compression and confining pressure on energy dissipation of sandstone under cyclical impact[J].Rock and Soil Mechanics,2013,34(11):3096-3102;3109.
[14]邱加冬,李地元,李夕兵,等.预制缺陷对花岗岩层裂破坏的影响[J].爆炸与冲击,2018,38(3):665-670.DOI:10.11883/bzycj-2016-0310.QIU Jiadong,LI Diyuan,LI Xibing,et al.Effect of pre-existing flaws on spalling fracture of granite[J].Explosion and Shock Waves,2018,38(3):665-670.DOI:10.11883/bzycj-2016-0310.
[15]周磊,朱哲明,董玉清,等.冲击加载下巷道内裂纹的扩展特性及破坏行为[J].爆炸与冲击,2018,38(4):785-794.DOI:10.11883/bzycj-2016-0383.ZHOU Lei,ZHU Zheming,DONG Yuqing,et al.Propagation characteristics and failure behaviors of crack in tunnel under impact loads[J].Explosion and Shock Waves,2018,38(4):785-794.DOI:10.11883/bzycj-2016-0383.
[16]李夕兵,周子龙,叶州元,等.岩石动静组合加载力学特性研究[J].岩石力学与工程学报,2008,27(7):1387-1395.LI Xibing,ZHOU Zilong,YE Zhouyuan,et al.Study on mechanical properties of rock static and dynamic loading[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(7):1387-1395.
[17]LI Xibing,ZHOU Zilong,LOK Tatseng,et al.Innovative testing technique of rock subjected to coupled static and dynamic loads[J].International Journal of Rock Mechanics and Mining Sciences,2008,45(5):739-748.
[18]LI X B,LOK T S,ZHAO J,et al.Oscillation elimination in the Hopkinson bar apparatus and resultant complete dynamic stress-strain curves for rocks[J].International Journal of Rock Mechanics and Mining Sciences,2000,37(7):1055-1060.
[19]李夕兵.岩石动力学基础与应用[M].北京:科学出版社,2014:20-21.