非线性准则下节理岩体稳定性的屈服接近度分析
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摘要
为了将Barton-Bandis非线性破坏准则与岩体稳定性判断标准的屈服接近度相结合,推导Barton-Bandis准则强度参数和Mohr-Coulomb线性破坏准则强度参数之间的关系,然后,通过算例分析,讨论Barton-Bandis准则参数对于节理岩体屈服接近度的影响,得到Barton-Bandis参数表征的屈服接近度YAIbb。研究结果表明:YAIbb随节理粗糙系数JRC的增大而减小,JRC越大,岩体节理面越粗糙,岩体的稳定性越高,二者的关系符合线性特征;YAIbb随节理岩体压缩强度JCS的增大而减小,JCS越大,岩体的单轴压缩强度越大,则岩体越致密,强度越高,稳定性越大,破坏的概率越小,二者的关系可用指数方程进行描述。
In order to combine the advantages of Barton-Bandis nonlinear failure criterion and yielding approach index of rock classifying standard,firstly,the relationship between parameters of Barton-Bandis nonlinear failure criterion and Mohr-Coulomb linear failure criterion was deduced;then according to the calculation example analysis,the effects of Barton-Bandis criterion parameters on the yielding approach index of joint rock mass were discussed.The results show that the yielding approach index YAIbb described by Barton-Bandis criterion parameters can be obtained according to the theoretical calculation;YAIbb decreases with the increase of joint roughness coefficient JRC,and the larger the JRC is,the more rough the rock mass joint plane is,which leads to the higher stability of rock mass,and the relationship between YAIbb and JRC can be described by linear equation;YAIbb decreases with the increase of jointed rock compressive strength JCS,that is because,the high JCS is caused by the high axial strength of rock mass,which will leads to greater density of rock mass with high strength,high stability and lower probability of failure,and the relationship between YAIbb and JCS can be described by exponential equation.
In order to combine the advantages of Barton-Bandis nonlinear failure criterion and yielding approach index of rock classifying standard,firstly,the relationship between parameters of Barton-Bandis nonlinear failure criterion and Mohr-Coulomb linear failure criterion was deduced;then according to the calculation example analysis,the effects of Barton-Bandis criterion parameters on the yielding approach index of joint rock mass were discussed.The results show that the yielding approach index YAIbb described by Barton-Bandis criterion parameters can be obtained according to the theoretical calculation;YAIbb decreases with the increase of joint roughness coefficient JRC,and the larger the JRC is,the more rough the rock mass joint plane is,which leads to the higher stability of rock mass,and the relationship between YAIbb and JRC can be described by linear equation;YAIbb decreases with the increase of jointed rock compressive strength JCS,that is because,the high JCS is caused by the high axial strength of rock mass,which will leads to greater density of rock mass with high strength,high stability and lower probability of failure,and the relationship between YAIbb and JCS can be described by exponential equation.
引文
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[17]杜时贵,郭霄,颜育仁.JRC-JCS模型在抗剪强度参数取值中的应用[J].金华职业技术学院学报,2004,4(1):1－4.DU Shi-gui,GUO Xiao,YAN Yu-ren.JRC-JCS model and its application on studying shear strength of rock joint[J].Journal of Jinhua College of Profession and Technology,2004,4(1):1－4.
[2]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):3083－3087.ZHOU Hui,ZHANG Chuan-qing,FENG Xia-ting,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):3083－3087.
[3]张传庆,周辉,冯夏庭.基于破坏接近度的岩土工程稳定性评价[J].岩土力学,2007,28(5):888－894.ZHANG Chuan-qing,ZHOU Hui,FENG Xia-ting.Stability assessment of rockmass engineering based on failure approach index[J].Rock and Soil Mechanics,2007,28(5):888－894.
[4]张传庆,周辉,冯夏庭,等.基于屈服接近度的围岩安全性随机分析[J].岩石力学与工程学报,2007,26(2):292－299.ZHANG Chuan-qing,ZHOU Hui,FENG Xia-ting,et al.Stochastic analysis method on safety of surrounding rock mass based on yielding approach index[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(2):292－299.
[5]李晓红,王宏图,贾剑青,等.隧道及地下工程围岩稳定性及可靠性分析的极限位移判别[J].岩土力学,2005,26(6):850－854.LI Xiao-hong,WANG Hong-tu,JIA Jian-qing,et al.Ultimate displacement discrimination of stability and reliability analysis of surrounding rocks of tunnel and underground engineering[J].Rock and Soil Mechanics,2005,26(6):850－854.
[6]YANG Xiao-li,YIN Jian-hua.Slope stability analysis with nonlinear failure criterion[J].Journal of Engineering Mechanics,2004,130(3):267－273.
[7]林杭,曹平,赵延林,等.强度折减法在Hoek-Brown准则中的应用[J].中南大学学报:自然科学版,2007,38(6):1219－1224.LIN Hang,CAO Ping,ZHAO Yan-lin,et al.The application of strength reduction method in Hoek-Brown criterion[J].Journal of Central South University:Science and Technology,2007,38(6):1219－1224.
[8]赵坚.岩石节理剪切强度的JRC-JMC新模型[J].岩石力学与工程学报,1998,17(4):349－357.ZHAO Jian.A new JRC-JMC shear strength criterion for rock joint[J].Chinese Journal of Rock Mechanics and Engineering,1998,17(4):349－357.
[9]杜时贵.岩体结构面的工程性质[M].北京:地震出版社,1999:89－93.DU Shi-gui.Engineering characteristic of rock mass joint[M].Beijing:Earthquake Press,1999:89－93.
[10]Choi S O,Chung K.Stability analysis of jointed rock slopes with the barton-bandis constitutive model in UDEC[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(s1):581－586.
[11]Fotoohi K,Mitri H S.Non-linear fault behaviour near underground excavations:A boundary element approach[J].International Journal for Numerical and Analytical Methods in Geomechanics,1998,20(3):173－190.
[12]潘昌实,张弥,吴鸿庆.隧道力学数值方法[M].北京:中国铁道出版社,1995:72－74.PAN Chang-shi,ZHANG Mi,WU Hong-qing.Numerical analysis method for tunnels[M].Beijing:China Railway Publishing House,1995:72－74.
[13]杜丽惠,黄丽清.考虑围岩蠕变特性的轴对称有限元非线性分析[J].水利学报,2001,32(1):85－89.DU Li-hui,HUANG Li-qing.The nonlinear axisymmetric finite element method for analysis of surrounding rock in consideration of creeping[J].Journal of Hydraulic Engineering,2001,32(1):85－89.
[14]Barton N,Choubey V.The shear strength of rock joints in theory and practice[J].Rock Mechanics,1977,10(2):1－54.
[15]Barton N R.Review of a new shear strength criterion for rock joints[J].Eng Geol,1973,76(2):287－332.
[16]陶振宇.水工建设中的岩石力学问题[M].北京:水利水电出版社,1979:58－63.TAO Zhen-yu.Rock mechanics problem in hydraulic construction[M].Beijing:Water Resources and Hydropower Press,1979:58－63.
[17]杜时贵,郭霄,颜育仁.JRC-JCS模型在抗剪强度参数取值中的应用[J].金华职业技术学院学报,2004,4(1):1－4.DU Shi-gui,GUO Xiao,YAN Yu-ren.JRC-JCS model and its application on studying shear strength of rock joint[J].Journal of Jinhua College of Profession and Technology,2004,4(1):1－4.
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