基于Barton-Bandis非线性破坏准则的岩体强度预测
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摘要
为了采用Barton-Bandis模型描述岩体特征,并将其参数应用于数值计算中,探讨Barton-Bandis参数到Mohr-Coulomb准则参数的转换,研究Barton-Bandis参数对Mohr-Coulomb参数的影响。研究结果表明:Barton-Bandis参数到Mohr-Coulomb准则参数的转换方法方便有效;随着节理粗糙系数JRC和节理压缩强度JCS的增大,Mohr-Coulomb参数粘结力c和内摩擦角φ均呈现非线性增大,可通过指数方程对其关系进行拟合;JRC的变化对粘结力的影响大于其对内摩擦角的影响;JRC对岩体剪切强度的影响大于JCS对岩体剪切强度的影响。
In order to describe the rock mass characteristic based on the Barton-Bandis model,and apply its parameters in the numerical calculation,the transfer method from Barton-Bandis criterion parameters to the Mohr-Coulomb criterion parameters was proposed.The effects of Barton-Bandis criterion parameters on the Mohr-Coulomb criterion parameters were studied.The results show that the transfer method from Barton-Bandis criterion parameters to the Mohr-Coulomb criterion parameters is suitable and convenient.With the increase of friction coefficient JRC and compressive strength of joint JCS,the cohesion c and friction angleφof Mohr-Coulomb parameters increase at the same time in the nonlinear form,whose relationship can be fitted by exponential equation.The variation of JRC has larger impact on the cohesion than that on the friction angle;and the impact of JRC on the shear strength of rock mass is larger than that of JCS.
In order to describe the rock mass characteristic based on the Barton-Bandis model,and apply its parameters in the numerical calculation,the transfer method from Barton-Bandis criterion parameters to the Mohr-Coulomb criterion parameters was proposed.The effects of Barton-Bandis criterion parameters on the Mohr-Coulomb criterion parameters were studied.The results show that the transfer method from Barton-Bandis criterion parameters to the Mohr-Coulomb criterion parameters is suitable and convenient.With the increase of friction coefficient JRC and compressive strength of joint JCS,the cohesion c and friction angleφof Mohr-Coulomb parameters increase at the same time in the nonlinear form,whose relationship can be fitted by exponential equation.The variation of JRC has larger impact on the cohesion than that on the friction angle;and the impact of JRC on the shear strength of rock mass is larger than that of JCS.
引文
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[2]Galic D,Glaser S D,Goodman R E.Calculating the shear strength of a sliding asymmetric block under varying degrees of lateral constraint[J].International Journal of Rock Mechanics and Mining Sciences,2008,45(8):12871305.
[3]Singh M,Singh B.High lateral strain ratio in jointed rockmasses[J].Engineering Geology,2008,98(3):7585.
[4]何忠明,曹平.考虑应变软化的地下采场开挖变形稳定性分析[J].中南大学学报:自然科学版,2008,39(4):641646.HE Zhong-ming,CAO Ping.Deformation and stability analysis of underground stope after excavation considering strain softening[J].Journal of Central South University:Science and Technology,2008,39(4):641646.
[5]YANG Xiao-li,YIN Jian-hua.Slope stability analysis with nonlinear failure criterion[J].Journal of Engineering Mechanics,2004,130(3):267273.
[6]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):349357.ZHAO Jian.A new JRC-JMC shear strength criterion for rock joint[J].Chinese Journal of Rock Mechanics and Engineering,1998,17(4):349357.
[7]Ladanyi B,Archambault G.Simulation of the shear behaviour of a jointed rock mass[C]//Proceedings of the11th US Symposium of Rock Mechanics.Berkeley,1970:105125.
[8]Barton N,Choubey V.The shear strength of rock joints in theory and practice[J].Rock Mechanics,1977,10(1):154.
[9]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):581586.
[10]杜时贵.岩体结构面的工程性质[M].北京:地震出版社,1999.DU Shi-gui.Engineering characteristic of rock mass joint[M].Beijing:Earthquake Press,1999.
[11]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.TAO Zhen-yu.Rock mechanics problem in hydraulic construction[M].Beijing:Water Resources and Hydropower Press,1979.
[12]Hoek E,Bray J.Rock slope engineering[M].London:Institute of Mineral and Metallurgy,1981.
[13]林杭,曹平,李江腾,等.基于广义Hoek-Brown准则的边坡安全系数间接解法[J].煤炭学报,2008,33(10):11471151.LIN Hang,CAO Ping,LI Jiang-teng,et al.The indirect calculation method for the safety factor of slope based on generalized Hoek-Brown criterion[J].Journal of China Coal Society,2008,33(10):11471151.
[14]Priest S D.Determination of shear strength and three-dimensional yield strength for the Hoek-Brown criterion[J].Rock Mech Rock Engng,2005,38(4):299327.
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