动力扰动下深部巷道围岩力学响应FLAC分析
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摘要
深部巷道具有强烈的动力扰动特征。采用有限差分数值计算软件FLAC(Fast La-grangian Analysis of Continua)对动力扰动下巷道围岩力学响应进行了数值分析。结果表明:动力扰动增大巷道顶、底板的水平应力峰值,并使峰值位置后置;扰动后巷道顶板下沉量及巷道围岩塑性区范围显著增加。原岩应力越大,动力扰动对巷道围岩应力场、位移场及塑性区范围影响就越显著,对于深部高应力巷道,动力扰动可使巷道顶、底板的水平应力峰值达到极高应力状态,并存在大范围的塑性屈服区域,具有发生岩爆的危险。
The deep tunnel has strong dynamic disturbance characteristics.A series of numerical simulation tests have been carried out using a finite difference code FLAC(Fast Lagrangian Analysis of Continua)to study mechanical responses of tunnel surrounding rock mass under the action of dynamic disturbance.A 60m×60m plane strain model containing a single 4m×4m centrally located tunnel is built and the dynamic disturbance is simulated by adding a sinusoid wave at the bottom of the model.The results show that after the action of dynamic disturbance,the magnitude of the highest horizontal stress both in the roof and floor of the tunnel will increase.And the distances from the roof line and floor line to the location of the highest horizontal stress will also increase.Significant downward roof movement increasing and plastic yield fields increasing can also be observed.The higher the in situ stress,the more significant dynamic disturbance influences on stress fields,displacement fields and plastic yield fields.Especially for the high-stress deep tunnel,dynamic disturbance may lead the highest horizontal stress increasing to a very high status in company of a large plastic yield fields and a critical status of rock crump.
The deep tunnel has strong dynamic disturbance characteristics.A series of numerical simulation tests have been carried out using a finite difference code FLAC(Fast Lagrangian Analysis of Continua)to study mechanical responses of tunnel surrounding rock mass under the action of dynamic disturbance.A 60m×60m plane strain model containing a single 4m×4m centrally located tunnel is built and the dynamic disturbance is simulated by adding a sinusoid wave at the bottom of the model.The results show that after the action of dynamic disturbance,the magnitude of the highest horizontal stress both in the roof and floor of the tunnel will increase.And the distances from the roof line and floor line to the location of the highest horizontal stress will also increase.Significant downward roof movement increasing and plastic yield fields increasing can also be observed.The higher the in situ stress,the more significant dynamic disturbance influences on stress fields,displacement fields and plastic yield fields.Especially for the high-stress deep tunnel,dynamic disturbance may lead the highest horizontal stress increasing to a very high status in company of a large plastic yield fields and a critical status of rock crump.
引文
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[2]康红普,林健,张晓.深部矿井地应力测量方法研究与应用[J].岩石力学与工程学报,2007,26(5):929-933.(KANG Hong-pu,LINJian,ZHANG Xiao.Re-search and Application of In-Situ Stress Measurementin Deep Mines[J].Chinese Journal of Rock Mechanicsand Engineering,2007,26(5):929-933.(in Chi-nese))
[3]康红普.深部巷道锚杆支护理论与技术[A].地下开采现代技术理论与实践新进展[C].北京:煤炭工业出版社,2007.(KANG Hong-pu.Theory and Technolo-gy of rock bolting for deep roadway[A].New Develop-ment of Theory and Practice for Underground Mining[C].Beijing:Coal Industry Press.(in Chinese))
[4]王明洋,周泽平,钱七虎.深部岩体的构造和变形与破坏问题[J].岩石力学与工程学报,2006,25(3):448-455.(WANG Ming-yang,ZHOUZe-ping,QIANQi-hu.Tectonic,Deformation and Failure Problems ofDeep Rock Mass[J].Chinese Journal of Rock Mechan-ics and Engineering,2006,25(3):448-455.(in Chi-nese))
[5]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):2 803-2813.(HE Man-chao,XIE He-ping,PENG Su-ping,etal.Study on Rock Mechanics in Deep Mining Engineer-ing[J].Chinese Journal of Rock Mechanics and Engi-neering,2005,24(16):2803-2813.(in Chinese))
[6]朱万成,左宇军,尚世明,等.动态扰动触发深部巷道发生失稳破裂的数值模拟[J].岩石力学与工程学报,2007,26(5):915-921.(ZHU Wan-cheng,ZUOYu-jun,SHANG Shi-ming,et al.Numerical Simulationof Instable Failure of Deep Rock Tunnel Triggered byDynamic Disturbance[J].Chinese Journal of Rock Me-chanics and Engineering,2007,26(5):915-921.(inChinese))
[7]李夕兵,李地元,郭雷,等.动力扰动下深部高应力矿柱力学响应研究[J].岩石力学与工程学报,2007,26(5):922-928.(LI Xi-bing,LI Di-yuan,GUO Lei,et al.Study on Mechanical Response of Highly-Stressed Pillars in Deep Mining Under Dynamic Disturb-ance[J].Chinese Journal of Rock Mechanics and Engi-neering,2007,26(5):922-928.(in Chinese))
[8]闫长斌,徐国元,李夕兵.爆破震动对采空区稳定性影响的FLAC3D分析[J].岩石力学与工程学报,2005,24(16):2 894-2 899.(YAN Chang-bin,XUGuo-yuan,LI Xi-bing,et al.Stability Analysis of Mined-Out Areas Influenced by Blasting Vibration withFLAC3D[J].Chinese Journal of Rock Mechanics andEngineering,2005,24(16):2 894-2 899.(in Chi-nese))
[9]龙源,冯长根,徐全军,等.爆破地震波在岩石介质传播特性与数值计算研究[J].工程爆破,2000,6(3):1-7.(LONG Yuan,FENG Chang-gen,XU Quan-jun,et al.Study on the Characteristics of Seismic WaveTransmit Through Rock Media and Numerical Simulation[J].Engineering Blasting,2000,6(3):1-7.(in Chi-nese))
[10]Itasca Consulting Group Inc..FLAC(Fast Lagrangian A-nalysis of Continua)User Manuals(Version 5.0)[R].Minneapolis,Minnesota:Itasca Consulting Group Inc.,2004.
[11]薛亚东,张世平,康天合.回采巷道锚杆动力响应的数值分析[J].岩石力学与工程学报,2003,22(11):1903-1906.(XUE Ya-dong,ZHANG Shi-ping,KANGTian-he.Numerical analysis on the Dynamic Responseof Rock bolts in coal mine roadway[J].Chinese Journalof Rock Mechanics and Engineering,2003,22(11):1903-1906.(in Chinese))
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