考虑滑面贯通和退化的岩质边坡动力稳定性分析
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摘要
本文在岩质边坡离散元模型中的岩石块体中设置虚拟节理,将滑动面切割为许多线段相连的直线段,使得模拟滑动面贯通破坏过程成为可能,进而改进了UDEC软件中的Mohr-Coulomb结构面接触模型,使其能够反映结构面在循环荷载下的退化效应。通过算例分析结果表明:考虑滑动面贯通过程的岩质边坡安全系数小于不考虑贯通过程的安全系数,且随着虚拟节理间距的减小,安全系数逐渐增大,最后趋于定值;考虑滑动面退化过程的岩质边坡的安全系数小于不考虑滑动面退化的安全系数,且随着滑动面抗损伤能力的下降,安全系数变小。
By adding certain virtual joints into the intact rock in the model,the slip plane of a rock slope could be cut into several pieces of joining lines,which make possible the simulation of the progressive failure of rock slope with obvious slip plane.In addition,amending the original constitutive model of UDEC software makes it possible to simulate the progressive degradation of joints under cycling loading.The results of simulation example indicate that the calculated factor of safety is smaller than that without the consideration of the progressive degradation of slip joints and the progressive failure process of the slip plane.The safety factor of the rock slope is growing as the adding of the number of the cutting pieces of the slip plane,and reducing as the waning of the ability to resist the shear damage of the slip plane.
By adding certain virtual joints into the intact rock in the model,the slip plane of a rock slope could be cut into several pieces of joining lines,which make possible the simulation of the progressive failure of rock slope with obvious slip plane.In addition,amending the original constitutive model of UDEC software makes it possible to simulate the progressive degradation of joints under cycling loading.The results of simulation example indicate that the calculated factor of safety is smaller than that without the consideration of the progressive degradation of slip joints and the progressive failure process of the slip plane.The safety factor of the rock slope is growing as the adding of the number of the cutting pieces of the slip plane,and reducing as the waning of the ability to resist the shear damage of the slip plane.
引文
[1]霍克.刘丰收,崔志芳,王学潮译.实用岩石工程技术[M].河南:黄河水利出版社,2002.
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[3]宁宇,徐卫亚,郑文棠.应用离散元强度折减对复杂边坡进行稳定性分析[J].岩土力学,2007,28(增刊):569-574.
[4]雷远见,王水林.基于离散元的强度折减法分析岩质边坡稳定性[J].岩土力学,2006,27:1693-1706.
[5]Hutson,R.W.,C.H.Dowding.Joint asperity degradation duringcyclic shear[J].Int J.Rock Mech.Min.Sci&Geomech.Abstr.,1990,27(2):109-119.
[6]Lee,H.S.,Y.J.Park,T.F.Cho,et al.Influence of asperity deg-radation on the mechanical behavior of rough rock joints undercyclic shear loading[J].Int J.Rock Mech.Min.Sci.,2001,38:967-980.
[7]Fox,D.J.,D.D.Kana,S.M.Hsiung.Influence of interfaceroughness on dynamic shear behavio in jointed rock[J].Int J.Rock.Mech.Min.Sci.,1998,35(7):967-980.
[8]Yang,Z.Y.,C.C.Di,K.C.Yen.The effect of asperity order onthe roughness of rock joints[J].Int J.Rock Mech.Min.Sci.,2001,38:745-752.
[9]Itasca Consulting Group,Inc.UDEC(Universal Distinct Ele-ment Code)User’s Manual,Version3.0[R].[S.L.]:ItascaConsulting Group,1996.
[10]Lin,J.S.,R.V.Whitman.Earthquake induced displacements ofsliding blocks[J].J.Geotech.Engng.Div.,1986,112(1):44-59.
[11]Nadim,F.,R.V.Whitman.Seismically induced movement of re-taining walls[J].J.Geotech.Engng.Div.,1983,109(GT7):915-931.
[12]胡聿贤.地震工程学[M].北京:地震出版社,1988.
[13]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):2385-2394.
[2]周维垣,杨若琼,杨强,等.岩石力学的解析与数值模拟[A].中国岩石力学与工程世纪成就[C].南京:河海大学出版社,2004.
[3]宁宇,徐卫亚,郑文棠.应用离散元强度折减对复杂边坡进行稳定性分析[J].岩土力学,2007,28(增刊):569-574.
[4]雷远见,王水林.基于离散元的强度折减法分析岩质边坡稳定性[J].岩土力学,2006,27:1693-1706.
[5]Hutson,R.W.,C.H.Dowding.Joint asperity degradation duringcyclic shear[J].Int J.Rock Mech.Min.Sci&Geomech.Abstr.,1990,27(2):109-119.
[6]Lee,H.S.,Y.J.Park,T.F.Cho,et al.Influence of asperity deg-radation on the mechanical behavior of rough rock joints undercyclic shear loading[J].Int J.Rock Mech.Min.Sci.,2001,38:967-980.
[7]Fox,D.J.,D.D.Kana,S.M.Hsiung.Influence of interfaceroughness on dynamic shear behavio in jointed rock[J].Int J.Rock.Mech.Min.Sci.,1998,35(7):967-980.
[8]Yang,Z.Y.,C.C.Di,K.C.Yen.The effect of asperity order onthe roughness of rock joints[J].Int J.Rock Mech.Min.Sci.,2001,38:745-752.
[9]Itasca Consulting Group,Inc.UDEC(Universal Distinct Ele-ment Code)User’s Manual,Version3.0[R].[S.L.]:ItascaConsulting Group,1996.
[10]Lin,J.S.,R.V.Whitman.Earthquake induced displacements ofsliding blocks[J].J.Geotech.Engng.Div.,1986,112(1):44-59.
[11]Nadim,F.,R.V.Whitman.Seismically induced movement of re-taining walls[J].J.Geotech.Engng.Div.,1983,109(GT7):915-931.
[12]胡聿贤.地震工程学[M].北京:地震出版社,1988.
[13]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):2385-2394.
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