岩石-混凝土两相介质胶结面抗剪强度分形描述
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摘要
针对润扬大桥南汊悬索桥锚碇胶结面抗剪强度取值问题,运用分形几何理论,从岩体结构面起伏角的角度出发,建立了均方根角法(ARMSS)测算岩石与混凝土胶结面轮廓线的分形维数,并给出了分形维数与粗糙系数(JRC)之间的相关关系。通过大量的混凝土–花岗岩粗糙胶结面抗剪强度试验,探讨了两相介质胶结面粗糙度对其抗剪强度参数值大小、剪切变形特性以及剪切破坏机制的影响,得到了胶结面粗糙度分形维数与抗剪强度指标之间的经验关系式。研究结果为润扬大桥南汊悬索桥南北锚碇抗滑结构设计提供了可靠的理论依据和借鉴作用。
For acquiring the shear strength of cementation plane of south anchor of Runyang Suspension Bridge over the Yangtze River,and on the basis of fractal geometry theory and from undulation angle of rock mass′s structural plane,a new method called angle of root mean square slope method(ARMSS) is proposed to calculate fractal dimensions of contours of cementation plane.Furthermore,the relationship between fractal dimension and roughness coefficient is given.From tests of shear strength of two-phase rough cementation planes,the influences of two-phase roughness coefficient on its shear strength,shear deformation behavior and shear failure mechanism are discussed.The research results can provide a theory foundation for friction structure design of anchors of Runyang Suspension Bridge.
For acquiring the shear strength of cementation plane of south anchor of Runyang Suspension Bridge over the Yangtze River,and on the basis of fractal geometry theory and from undulation angle of rock mass′s structural plane,a new method called angle of root mean square slope method(ARMSS) is proposed to calculate fractal dimensions of contours of cementation plane.Furthermore,the relationship between fractal dimension and roughness coefficient is given.From tests of shear strength of two-phase rough cementation planes,the influences of two-phase roughness coefficient on its shear strength,shear deformation behavior and shear failure mechanism are discussed.The research results can provide a theory foundation for friction structure design of anchors of Runyang Suspension Bridge.
引文
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[11]邢福东.岩石-混凝土两相介质胶结面抗剪强度分形描述及其工程应用[硕士学位论文][D].南京:河海大学,2004.(Xing Fudong.Fractal description on shear strength of cement face of rock-concrete and its engineering application[M.S.Thesis][D].Nanjing:Hohai University,2004.(in Chinese))
[12]杜时贵.岩体结构面的工程性质[M].北京:地震出版社,1999.(Du Shigui.Engineering Properties of Structural Plane of Rock Mass[M].Beijing:Earthquake Press,1999.(in Chinese))
[2]Tse R,Cruden D M.Estimating joint roughness coefficient[J].Int.J.Rock Mech.Min.Sci.and Geomech.Abstr.,1979,16:303-307.
[3]孙宗欣,徐方明.岩石节理表面特性的研究及其分级[J].岩石力学与工程学报,1991,10(1):67-73.(Sun Zongxin,Xu Fangming.The research and classification to surface characteristic of rock joints[J].Chinese Journal of Rock Mechanics and Engineering,1991,10(1):67-73.(in Chinese))
[4]Turk N,Greig M J,Dearman W R,et al.Characterization of rock joint surfaces by fractal dimension[A].In:Proceedings of the 28th Symposium on Rock Mechanics[C].Tucson:[s.n.],1987.1 223-1 236.
[5]Lee Y H,Har J R,Bars D J,et al.The fractal dimension as a measure of the roughness of rock discontinuity profiles[J].Int.J.Rock Mech.Min.Sci.and Gemech.Abstr.,1990,27:453-464.
[6]Sakellariou M,Nakos B,Metsakaki.On the fractal character of rock surface[J].Int.J.Rock Mech.Min.Sci.and Geomech.Abstr.,1991,28:527-533.
[7]Seidel J P,Haberfield C M.Toward an understanding of joint roughness[J].Rock Mech.Rock Eng.,1995,28:69-92.
[8]Xie H.Fractals in Rock Mechanics[M].Rotterdam:A.A.Balkema,1993.
[9]冯夏庭,Kosugi M,王泳嘉.岩石节理力学参数的非线性估计[J].岩土工程学报,1999,21(3):268-272.(Feng Xiating,Kosugi M,Wang Yongjia.Nonlinear estimation of rock joint mechanical parameters[J].Chinese Journal of Geotechnical Engineering,1999,21(3):268-272.(in Chinese))
[10]Yang Z Y,Di C C,Yen K C.The effect of asperity order on the roughness of rock joints[J].Int.J.Rock Mech.Min.Sci.,2001,38:745-752.
[11]邢福东.岩石-混凝土两相介质胶结面抗剪强度分形描述及其工程应用[硕士学位论文][D].南京:河海大学,2004.(Xing Fudong.Fractal description on shear strength of cement face of rock-concrete and its engineering application[M.S.Thesis][D].Nanjing:Hohai University,2004.(in Chinese))
[12]杜时贵.岩体结构面的工程性质[M].北京:地震出版社,1999.(Du Shigui.Engineering Properties of Structural Plane of Rock Mass[M].Beijing:Earthquake Press,1999.(in Chinese))
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