非贯通节理岩体等效强度及破坏特性
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摘要
应用PFC2D数值模拟软件,选取适当的细观力学参数,建立非贯通节理岩体试样数值模型并进行双轴试验,设置监控圆监测岩体压缩过程非贯通节理面上不同位置应力及其变化情况。以莫尔-库仑强度准则为基础,对非贯通节理的等效强度参数进行推导,提出含非贯通节理的岩体等效强度公式。建立等效岩石试样和节理岩体试样数值模型进行双轴压缩试验,对含非贯通节理岩体等效强度进行数值模拟。研究结果表明:双轴压缩过程岩桥上应力大于相同时刻节理面上的应力,且岩桥达到峰值强度时节理面并没有达到峰值强度。等效强度公式计算得到的非贯通节理岩体强度与数值模拟得到的强度比较接近,应力-应变曲线基本一致。
By using the numerical simulation software PFC2 D, the appropriate micro mechanics parameters were selected, then the model of jointed rock mass specimen was established and measurement circle at different position of joint surface was set up to monitor the stress changes. Based on Mohr-coulomb strength criterion, the equivalent strength of rock mass with single intermittent joint was deduced and an equivalent conversion formula was given. Different joint penetration rate and confining pressure level were set before the model of equivalent rock and jointed rock mass specimen were established, and then the equivalent strength theory was demonstrated by biaxial tests. The results show that the stress on rock bridge is greater than the stress on joint at the same time through the whole biaxial test. The strength parameters calculated with the formula get high consistency with the parameters of numerical simulation and the stress-strain of joint rock and equivalent rock has high similarity.
By using the numerical simulation software PFC2 D, the appropriate micro mechanics parameters were selected, then the model of jointed rock mass specimen was established and measurement circle at different position of joint surface was set up to monitor the stress changes. Based on Mohr-coulomb strength criterion, the equivalent strength of rock mass with single intermittent joint was deduced and an equivalent conversion formula was given. Different joint penetration rate and confining pressure level were set before the model of equivalent rock and jointed rock mass specimen were established, and then the equivalent strength theory was demonstrated by biaxial tests. The results show that the stress on rock bridge is greater than the stress on joint at the same time through the whole biaxial test. The strength parameters calculated with the formula get high consistency with the parameters of numerical simulation and the stress-strain of joint rock and equivalent rock has high similarity.
引文
[1]蔡美峰.岩石力学与工程.北京:科学出版社,2004:84-89.CAI Meifeng.Rock mechanics and engineering[M].Beijing:Science Press,2004:84-89.
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[10]刘顺桂,刘海宁,王思敬,等.断续节理直剪试验与PFC2D数值模拟分析[J].岩石力学与工程学报,2008,27(9):1828-1836.LIU Shungui,LIU Haining,WANG Sijing,et al.Direct shear tests and PFC2D numerical simulation of intermittent joints[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(9):1828-1836.
[11]范景伟,何江达.含定向闭合断续节理岩体的强度特性[J].岩石力学与工程学报,1992,11(2):190-199.FAN Jingwei,HE Dajiang.The strength behavior of rock masses containing oriented and closed intermittent joints[J].Chinese Journal of Rock Mechanics and Engineering,1992,11(2):190-199.
[12]WANG C,TANNANT D D,LILLY P A.Numerical analysis of the stability of heavily jointed rock slopes using PFC2D[J].International Journal of Rock Mechanics and Mining Sciences,2009,40(3):415-424.
[13]李同录,罗世毅.节理岩体力学参数的选取与应用[J].岩石力学与工程学报,2004,23(13):2182-2186.LI Tonglu,LUO Shiyi.Determination and application of mechanical parameters for jointed rock masses[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(13):2182-2186.
[14]周小平,张永兴,王建华,等.断续节理岩体劈裂破坏的贯通机理研究[J].岩石力学与工程学报,2005,24(1):8-12.ZHOU Xiaoping,ZHANG Yongxing,WANG Jianhua,et al.Study on coalescence mechanism of splitting failure of rock masses with intermittent joints under compression[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(1):8-12.
[15]ZHANG H Q,ZHAO Z Y,TANG C A,et al.Numerical study of shear behavior of intermittent rock joints with different geometrical parameters[J].International Journal of Rock Mechanics&Mining Sciences,2006,43(5):802-816.
[16]赵文.岩石力学.长沙:中南大学出版社,2004:65-66.ZHAO Wen.Rock mechanics[M].Changsha:Central South University Press,2004:65-66.
[2]周维垣.高等岩石力学[M].北京:水利电力出版社,1990:53-54.ZHOU Weiyuan.Advanced rock mechanics[M].Beijing:Water Resources and Electric Power Press,1990:53-54.
[3]刘东燕,叶晓明,朱凡.断续节理岩体强度评价及承载力预测[J].重庆建筑大学学报,1997,19(2):21-30.LIU Dongyan,YE Xiaoming,ZHU Fan.Intermittent joint strength assessment and bearing capacity prediction[J].Journal of Chongqing Jianzhu University,1997,19(2):21-30.
[4]陈新,廖志红,李德建.节理倾角及连通率对岩体强度、变形影响的单轴压缩试验研究[J].岩石力学与工程学报,2011,30(4):782-789.CHEN Xin,LIAO Zhihong,LI Dejian.Experimental study of effects of joint inclination angle and connectivity rate on strength and deformation properties of rock masses under uniaxial compression[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(4):782-789.
[5]夏才初,肖维民,刘远明.非贯通节理的岩桥弱化力学模型研究[J].岩石力学与工程学报,2010,29(8):1538-1545.XIA Caichu,XIAO Weimin,LIU Yuanming.Study of mechanical model for weakening process of discontinuous joint rock bridge[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(8):1538-1545.
[6]刘远明.基于直剪试验的非贯通节理岩体扩展贯通研究[D].上海:同济大学土木工程学院,2007:75-103.LIU Yuanming.Study on failure models and strength of rockmass containing discontinuous joints in direct shear[D].Shanghai:Tongji University.School of Civil Engineering,2007:75-103.
[7]吴顺川,周喻,高利立,等.等效岩体技术在岩体工程中的应用[J].岩石力学与工程学报,2010,29(7):1435-1441.WU Shunchuan,ZHOU Yu,GAO Lili,et al.Application of equivalent rock mass technique to rock mass engineering[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(7):1435-1441.
[8]周喻,吴顺川,张晓平.岩石节理直剪试验颗粒流宏细观分析[J].岩石力学与工程学报,2012,31(6):1245-1256.ZHOU Yu,WU Shunchuan,ZHANG Xiaoping.Macro-and meso-analyses of rock joint direct shear test using particle flow theory[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(6):1245-1256.
[9]金爱兵,李兵,邓富根.断续节理对岩体力学性能的影响[J].北京科技大学学报,2012,34(12),1359-1363.JIN Aibing,LI Bing,DENG Fugen.Effect of intermittent joints on the mechanical properties of rock mass[J].Journal of University of Science and Technology Beijing,2012,34(12):1359-1363.
[10]刘顺桂,刘海宁,王思敬,等.断续节理直剪试验与PFC2D数值模拟分析[J].岩石力学与工程学报,2008,27(9):1828-1836.LIU Shungui,LIU Haining,WANG Sijing,et al.Direct shear tests and PFC2D numerical simulation of intermittent joints[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(9):1828-1836.
[11]范景伟,何江达.含定向闭合断续节理岩体的强度特性[J].岩石力学与工程学报,1992,11(2):190-199.FAN Jingwei,HE Dajiang.The strength behavior of rock masses containing oriented and closed intermittent joints[J].Chinese Journal of Rock Mechanics and Engineering,1992,11(2):190-199.
[12]WANG C,TANNANT D D,LILLY P A.Numerical analysis of the stability of heavily jointed rock slopes using PFC2D[J].International Journal of Rock Mechanics and Mining Sciences,2009,40(3):415-424.
[13]李同录,罗世毅.节理岩体力学参数的选取与应用[J].岩石力学与工程学报,2004,23(13):2182-2186.LI Tonglu,LUO Shiyi.Determination and application of mechanical parameters for jointed rock masses[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(13):2182-2186.
[14]周小平,张永兴,王建华,等.断续节理岩体劈裂破坏的贯通机理研究[J].岩石力学与工程学报,2005,24(1):8-12.ZHOU Xiaoping,ZHANG Yongxing,WANG Jianhua,et al.Study on coalescence mechanism of splitting failure of rock masses with intermittent joints under compression[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(1):8-12.
[15]ZHANG H Q,ZHAO Z Y,TANG C A,et al.Numerical study of shear behavior of intermittent rock joints with different geometrical parameters[J].International Journal of Rock Mechanics&Mining Sciences,2006,43(5):802-816.
[16]赵文.岩石力学.长沙:中南大学出版社,2004:65-66.ZHAO Wen.Rock mechanics[M].Changsha:Central South University Press,2004:65-66.