基于节理摩擦能的地下洞室岩体结构动力稳定性评价
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摘要
根据岩体结构稳定性受节理面控制的特点,将节理摩擦能作为地下洞室岩体结构动力稳定性评价指标。依托大岗山水电站地下厂房,利用离散元法开展不同位置、倾角、摩擦角节理切割方案的动力计算,基于节理动力响应和节理摩擦能对比分析岩体结构稳定性,探讨节理摩擦能指标的适用性。结果表明,节理摩擦能适用于评价岩体结构剪切破坏情况,可反映洞室岩体结构在地震作用下破坏速度、破坏程度以及渐进破坏过程;顺倾切割时,倾角60°节理、高边墙下部切割节理对洞室岩体结构动力稳定性较为不利。
Due to stability of rock structure is controlled by the joint,frictional energy on joints is proposed as an indicator of stability evaluation for rock structure around underground cavern. Relying on the underground cavern of Dagangshan hydropower station,numerical simulations with discrete element method are performed for different combinations of joint orientation,joint spacing and joint friction angle. Stability of rock structure is checked based on frictional energy and dynamic response of joints respectively. The applicability of friction energy on joints is discussed. Results show that the index proposed can be applied to evaluate the shear destruction of rock structure around underground cavern which can reflect failure rate,failure history and damage size of rock structure;consequent joints with inclination of 60° and consequent joints cutting at lower position of high sidewall are less favorable to the dynamic stability of rock structure.
Due to stability of rock structure is controlled by the joint,frictional energy on joints is proposed as an indicator of stability evaluation for rock structure around underground cavern. Relying on the underground cavern of Dagangshan hydropower station,numerical simulations with discrete element method are performed for different combinations of joint orientation,joint spacing and joint friction angle. Stability of rock structure is checked based on frictional energy and dynamic response of joints respectively. The applicability of friction energy on joints is discussed. Results show that the index proposed can be applied to evaluate the shear destruction of rock structure around underground cavern which can reflect failure rate,failure history and damage size of rock structure;consequent joints with inclination of 60° and consequent joints cutting at lower position of high sidewall are less favorable to the dynamic stability of rock structure.
引文
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[2]朱维申,孙爱花,王文涛,等.大型洞室群高边墙位移预测和围岩稳定性判别方法[J].岩石力学与工程学报.2007,26(9):1 729–1 736.(ZHU Weishen,SUN Aihua,WANG Wentao,et al.Study on prediction of high wall displacement and ability judging method of surrounding rock for large cavern groups[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(9):1 729–1 736.(in Chinese))
[3]关宝树.隧道工程设计要点集[M].北京:人民交通出版社,2003:31–32.(GUAN Baoshu.Construction main points in tunnel engineering design main points in tunnel engineering[M].Beijing:China Communication,2003:31–32.(in Chinese))
[4]周辉,张传庆,冯夏庭,等.隧道及地下工程围岩的屈服接近度分析[J].岩石力学与工程学报,2005,24(17):3 083–3 087.(ZHOU Hui,ZHANG Chuanqing,FENG Xiating,et al.Analysis of rock mass stability in tunnel and underground engineering based on yield approach index[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(17):3 083–3 087.(in Chinese))
[5]赵尚毅,郑颖人,时卫民,等.用有限元强度折减法求边坡稳定安全系数[J].岩土工程学报.2002,24(3):343–346.(ZHAO Shangyi,ZHENG Yingren,SHI Weimin,et al.Slope safety factor analysis by strength reduction FEM[J].Chinese Journal of Geotechnical Engineering,2002,24(3):343–346.(in Chinese))
[6]张雨霆,肖明,陈俊涛.地震作用下地下洞室群整体安全系数计算与震后加固效果评价[J].四川大学学报:工程科学版,2010(5):217–223.(ZHANG Yuting,XIAO Ming,CHEN Juntao.The assessment of post-earthquake reinforcement measures and the calculation of safety factor for general stability of underground caverns under earthquake effect[J].Journal of Sichuan University:Engineering Science Edition,2010(5):217–223.(in Chinese))
[7]李海波,肖克强,刘亚群.地震荷载作用下顺层岩质边坡安全系数分析[J].岩石力学与工程学报,2007,26(12):2 385–2 394.(LI Haibo,XIAO Keqiang,LIU Yaqun.Factor of safety analysis of bedding rock slope under seismic load[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(12):2 385–2 394.(in Chinese))
[8]SHI G H,GOODMAN R E.Block theory and its application to rock engineering[M].Englewood Cliffs,New Jersey:Prentice-Hall,Inc.,1985:325–330.
[9]DE LEMOS J A S V.A distinct element model for dynamic analysis of jointed rock with application to dam foundations and fault motion[M].Minnesota:University of Minnesota,1997:114–117.
[10]BANDIS S,LUMSDEN A C,BARTON N R.Experimental studies of scale effects on the shear behaviour of rock joints[C]//Proceedings of International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts.Pergamon:[s.n.],1981,18(1):1–21.
[11]ZAMANI N,EL S U.Discrete-element method simulations of the response of soil-foundation-structure systems to multidirectional seismic motion[J].International Journal of Geomechanics,2012,13(5):595–610.
[12]刘刚,赵坚,宋宏伟,等.断续节理方位对巷道稳定性的影响[J].煤炭学报,2008,33(8):860–865.(LIU Gang,ZHAO Jian,SONG Hongwei,et al.Influence of intermittent joint orientation on roadway stability[J].Journal of China Coal Society,2008,33(8):860–865.(in Chinese))
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