JRC-JCS模型与直剪试验对比研究
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摘要
结构面抗剪强度是影响工程岩体稳定的重要因素,它决定工程岩体破坏的可能性。基于结构面粗糙度系数定向统计测量技术的JRC-JCS模型可以考虑地质和环境因素的影响,具有费用低、速度快、简便易行等特点,是获取工程岩体无填充或少填充硬岩结构面抗剪强度参数的实用方法,已为50多个岩体工程提供了结构面抗剪强度参数。为分析JRC-JCS模型评价结构面抗剪强度参数的可靠性,选取天然岩石结构面试样,进行干燥状态和饱和状态结构面抗剪强度直剪试验和JRC-JCS模型评价的对比研究。结果表明,在结构面粗糙度系数的定向统计测量、尺寸效应分析,以及剪切过程衰减折减的基础上,运用结构面粗糙度系数定向统计测量技术的JRC-JCS模型评价的结构面抗剪强度参数与直剪试验结果具有较好的一致性,JRC-JCS模型对结构面峰值摩擦角有较好的预测能力。
Shear strength of structural plane has an important influence on stability of engineering rock mass. It determines the probability of engineering rock mass failure. JRC-JCS model based on directional statistical measurement technology of roughness coefficient of structural plane can consider the effect of geology and environment. For structural planes with few filling or without filling,JRC-JCS model with advantages of low cost,fast estimation and easy manipulation can provide a practical method to obtain the shear strength parameters of structural plane in hard rocks. The model has been applied to fifty rock projects in order to get the shear strength parameters of structural planes. To analyze the reliability of estimating the shear strength parameters of structural planes with JRC-JCS model,the shear strengths of natural rocks with structural plane under dry and saturated conditions are measured by direct shear test and empirical estimation with JRC-JCS model. Then,the test results of shear strength are compared. The results show that the shear strength parameters estimated by JRC-JCS model and direct shear test agree well with each other on the basis of the directional statistical measurement,the analysis of JRC scale effect and the consideration of reduced JRC during the course of shear;and JRC-JCS model can estimate the peak friction angle of structural plane well.
Shear strength of structural plane has an important influence on stability of engineering rock mass. It determines the probability of engineering rock mass failure. JRC-JCS model based on directional statistical measurement technology of roughness coefficient of structural plane can consider the effect of geology and environment. For structural planes with few filling or without filling,JRC-JCS model with advantages of low cost,fast estimation and easy manipulation can provide a practical method to obtain the shear strength parameters of structural plane in hard rocks. The model has been applied to fifty rock projects in order to get the shear strength parameters of structural planes. To analyze the reliability of estimating the shear strength parameters of structural planes with JRC-JCS model,the shear strengths of natural rocks with structural plane under dry and saturated conditions are measured by direct shear test and empirical estimation with JRC-JCS model. Then,the test results of shear strength are compared. The results show that the shear strength parameters estimated by JRC-JCS model and direct shear test agree well with each other on the basis of the directional statistical measurement,the analysis of JRC scale effect and the consideration of reduced JRC during the course of shear;and JRC-JCS model can estimate the peak friction angle of structural plane well.
引文
[1]刘明维,傅华,吴进良.岩体结构面抗剪强度参数确定方法的现状及思考[J].重庆交通学院学报,2005,24(5):65–67.(LIU Mingwei,FU Hua,WU Jinliang.Current situation of determination methods of shear strength parameters of rock-mass discontinuities and new thoughts[J].Journal of Chongqing Jiaotong University,2005,24(5):65–67.(in Chinese))
[2]刘明维,郑颖人.岩质边坡结构面抗剪强度参数的实用确定方法研究[J].工程勘察,2006,(5):6–9.(LIU Mingwei,ZHENG Yingren.Practical determination of shear strength parameters of discontinuities in rock slope[J].Journal of Geotechnical Investigation and Surveying,2006,(5):6–9.(in Chinese))
[3]DU S G.Research on complexity of surface undulating shapes of rock joints[J].Journal of China University of Geosciences,1998,9(1):86–89.
[4]杜时贵,唐辉明.岩体断裂粗糙度系数的各向异性研究[J].工程地质学报,1993,1(2):32–41.(DU Shigui,TANG Huiming.A study on the anisotropy of joint roughness coefficient in rock mass[J].Journal of Engineering Geology,1993,1(2):32–41.(in Chinese))
[5]杜时贵.岩体结构面粗糙度系数JRC的定向统计研究[J].工程地质学报,1994,2(3):62–71.(DU Shigui.The directive statistical evaluation of rock joint roughness coefficient(JRC)[J].Journal of Engineering Geology,1994,2(3):62–71.(in Chinese))
[6]杜时贵,颜育仁,胡晓飞,等.JRC-JCS模型抗剪强度估算的平均斜率法[J].工程地质学报,2005,13(4):489–493.(DU Shigui,YAN Yuren,HU Xiaofei,et al.Average slope method for estimating shear strength of JRC-JCS model[J].Journal of Engineering Geology,2005,13(4):489–493.(in Chinese))
[7]杜时贵,杨树峰,姜舟,等.JRC快速测量技术[J].工程地质学报,2002,10(1):98–102.(DU Shigui,YANG Shufeng,JIANG Zhou,et al.A new technique for fast measurement of JRC[J].Journal of Engineering Geology,2002,10(1):98–102.(in Chinese))
[8]BARTON N.Review of a new shear strength criterion for rock joints[J].Engineering Geology,1973,7(4):287–332.
[9]BARTON N,CHOUBEY V.The shear strength of rock joints in theory and practice[J].Rock Mechanics and Rock Engineering,1977,10(1):1–54.
[10]BARTON N,BANDIS S.Review of predictive capability of JRC-JCS model in engineering practice[C]//BARTON N,STEPHANSSON O ed.Proceedings of the International Symposium on Rock Joints.Rotterdam:A.A.Balkema,1990:603–610.
[11]陈记,徐卫亚,朱珍德,等.基岩–混凝土胶结面剪切强度JRC-JCS模型研究[J].河海大学学报(自然科学版),2003,31(4):407–410.(CHEN Ji,XU Weiya,ZHU Zhende,et al.Study on JRC-JCS model for shear strength of bedrock-concrete cement planes[J].Journal of Hohai University(Natural Science),2003,31(4):407–410.(in Chinese))
[12]GRASSELLI G.Manuel Rocha medal recipient shear strength of rock joints based on quantified surface description[J].Rock Mechanics and Rock Engineering,2006,39(4):295–314.
[13]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 rock discontinuities[M].Beijing:Earthquake Press,1999.(in Chinese))
[14]杜时贵.岩体结构面抗剪强度经验估算[M].北京:地震出版社,2005.(DU Shigui.Empirical estimation for the shear strength of rock discontinuities[M].Beijing:Earthquake Press,2005.(in Chinese))
[15]GEERTSEMA A J.The shear strength of planar joints in mudstone[J].International Journal of Rock Mechanics and Mining Sciences,2002,39(8):1045–1049.
[16]中华人民共和国行业标准编写组.SL264–2001水利水电工程岩石试验规程[S].北京:中国水利水电出版社,2001.(The Professional Standards Compilation Group of People′s Republic of China.SL264–2001Specifications for rock tests in water conservancy and hydroelectric engineering[S].Beijing:China Water Power Press,2001.(in Chinese))
[17]BANDIS S,LUMSDEN A C,BARTON N R.Experimental studies of scale effects on the shear behavior of rock joints[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1981,18(1):1–21.
[18]FARDIN N,STEPHANSSON O,JING L.The scale dependence of rock joint surface roughness[J].International Journal of Rock Mechanics and Mining Sciences,2001,38(5):659–669.
[19]FENG Q,FARDIN N,JING L,et al.A new method for in situ non-contact roughness measurement of large rock fracture surfaces[J].Rock Mechanics and Rock Engineering,2003,36(1):3–25.
[20]FARDIN N,FENG Q,STEPHANSSON O.Application of a new in situ3D laser scanner to study the scale effect on the rock joint surfaces roughness[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(2):329–335.
[21]HOMAND F,BELEM T,SOULEY M.Friction and degradation of rock joints surfaces under shear loads[J].International Journal for Numerical and Analytical Methods in Geomechanics,2001,25(10):973–999.
[22]赵坚.岩石节理吻合系数及其对节理特性的影响[J].岩石力学与工程学报,1997,16(6):514–521.(ZHAO Jian.Joint matching coefficient and effects on behaviour of rock joint[J].Chinese Journal of Rock Mechanics and Engineering,1997,16(6):514–521.(in Chinese))
[2]刘明维,郑颖人.岩质边坡结构面抗剪强度参数的实用确定方法研究[J].工程勘察,2006,(5):6–9.(LIU Mingwei,ZHENG Yingren.Practical determination of shear strength parameters of discontinuities in rock slope[J].Journal of Geotechnical Investigation and Surveying,2006,(5):6–9.(in Chinese))
[3]DU S G.Research on complexity of surface undulating shapes of rock joints[J].Journal of China University of Geosciences,1998,9(1):86–89.
[4]杜时贵,唐辉明.岩体断裂粗糙度系数的各向异性研究[J].工程地质学报,1993,1(2):32–41.(DU Shigui,TANG Huiming.A study on the anisotropy of joint roughness coefficient in rock mass[J].Journal of Engineering Geology,1993,1(2):32–41.(in Chinese))
[5]杜时贵.岩体结构面粗糙度系数JRC的定向统计研究[J].工程地质学报,1994,2(3):62–71.(DU Shigui.The directive statistical evaluation of rock joint roughness coefficient(JRC)[J].Journal of Engineering Geology,1994,2(3):62–71.(in Chinese))
[6]杜时贵,颜育仁,胡晓飞,等.JRC-JCS模型抗剪强度估算的平均斜率法[J].工程地质学报,2005,13(4):489–493.(DU Shigui,YAN Yuren,HU Xiaofei,et al.Average slope method for estimating shear strength of JRC-JCS model[J].Journal of Engineering Geology,2005,13(4):489–493.(in Chinese))
[7]杜时贵,杨树峰,姜舟,等.JRC快速测量技术[J].工程地质学报,2002,10(1):98–102.(DU Shigui,YANG Shufeng,JIANG Zhou,et al.A new technique for fast measurement of JRC[J].Journal of Engineering Geology,2002,10(1):98–102.(in Chinese))
[8]BARTON N.Review of a new shear strength criterion for rock joints[J].Engineering Geology,1973,7(4):287–332.
[9]BARTON N,CHOUBEY V.The shear strength of rock joints in theory and practice[J].Rock Mechanics and Rock Engineering,1977,10(1):1–54.
[10]BARTON N,BANDIS S.Review of predictive capability of JRC-JCS model in engineering practice[C]//BARTON N,STEPHANSSON O ed.Proceedings of the International Symposium on Rock Joints.Rotterdam:A.A.Balkema,1990:603–610.
[11]陈记,徐卫亚,朱珍德,等.基岩–混凝土胶结面剪切强度JRC-JCS模型研究[J].河海大学学报(自然科学版),2003,31(4):407–410.(CHEN Ji,XU Weiya,ZHU Zhende,et al.Study on JRC-JCS model for shear strength of bedrock-concrete cement planes[J].Journal of Hohai University(Natural Science),2003,31(4):407–410.(in Chinese))
[12]GRASSELLI G.Manuel Rocha medal recipient shear strength of rock joints based on quantified surface description[J].Rock Mechanics and Rock Engineering,2006,39(4):295–314.
[13]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 rock discontinuities[M].Beijing:Earthquake Press,1999.(in Chinese))
[14]杜时贵.岩体结构面抗剪强度经验估算[M].北京:地震出版社,2005.(DU Shigui.Empirical estimation for the shear strength of rock discontinuities[M].Beijing:Earthquake Press,2005.(in Chinese))
[15]GEERTSEMA A J.The shear strength of planar joints in mudstone[J].International Journal of Rock Mechanics and Mining Sciences,2002,39(8):1045–1049.
[16]中华人民共和国行业标准编写组.SL264–2001水利水电工程岩石试验规程[S].北京:中国水利水电出版社,2001.(The Professional Standards Compilation Group of People′s Republic of China.SL264–2001Specifications for rock tests in water conservancy and hydroelectric engineering[S].Beijing:China Water Power Press,2001.(in Chinese))
[17]BANDIS S,LUMSDEN A C,BARTON N R.Experimental studies of scale effects on the shear behavior of rock joints[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1981,18(1):1–21.
[18]FARDIN N,STEPHANSSON O,JING L.The scale dependence of rock joint surface roughness[J].International Journal of Rock Mechanics and Mining Sciences,2001,38(5):659–669.
[19]FENG Q,FARDIN N,JING L,et al.A new method for in situ non-contact roughness measurement of large rock fracture surfaces[J].Rock Mechanics and Rock Engineering,2003,36(1):3–25.
[20]FARDIN N,FENG Q,STEPHANSSON O.Application of a new in situ3D laser scanner to study the scale effect on the rock joint surfaces roughness[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(2):329–335.
[21]HOMAND F,BELEM T,SOULEY M.Friction and degradation of rock joints surfaces under shear loads[J].International Journal for Numerical and Analytical Methods in Geomechanics,2001,25(10):973–999.
[22]赵坚.岩石节理吻合系数及其对节理特性的影响[J].岩石力学与工程学报,1997,16(6):514–521.(ZHAO Jian.Joint matching coefficient and effects on behaviour of rock joint[J].Chinese Journal of Rock Mechanics and Engineering,1997,16(6):514–521.(in Chinese))
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