基于等效岩体技术的节理参数对岩体强度影响性研究
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摘要
岩体中节理赋存位置隐蔽,参数获取难度大,研究不同节理参数变化对岩体强度的影响,有利于在节理测量中有针对性地提高测量精度,并找出对岩体强度弱化最明显的参数.基于等效岩体技术,研究了云南省光山1号隧道岩体节理离散裂隙网络(DFN)参数倾角均值、倾角标准差、节理尺寸、节理尺寸分布幂和节理密度对岩体表征单元(REV)单轴抗压强度的影响,分析了岩体强度对各参数的敏感性.研究结果表明:岩体强度对倾角均值有最大的敏感性,因此在节理测量中需重点加强对倾角的勘查;节理密度增大对岩体强度的弱化作用最明显,因此,当节理密度增大时,需及时调整施工方案并提高支护强度.该研究为节理勘查重点提供了参考,也为节理参数变化时隧道稳定性的快速预测提供了依据.
The location of the joints in the rock mass is concealed,and the parameter acquisition is difficult.Investigating the effect of different parameters of joints on the strength of rock mass is helpful to improve the measurement accuracy of joints and to find out the parameters that have the greatest effect on the weakening of the rock mass.Based on the equivalent rock mass technology,the influence of the Discrete Fracture Network(DFN)parameters of jointed rock mass on the uniaxial compressive strength of the Representative Elementary Volume(REV)were studied in Guangshan No.1 tunnel,Yunnan province.These parameters include mean dip angle,standard deviation of dip angle,joint size,the power of joint size distribution,and joint density.The sensitivity of these parameters on rock mass strength was also analyzed.The results show that:the strength of rock mass has the greatest sensitive to the joint mean dip angle.So it is necessary to strengthen the survey of dip angle.Increased joint density has the strongest weakening effect on rock mass strength.When the joint density increases,it is necessary to adjust the construction plan in time and improve the support strength.This study provides a reference for the key points of joint exploration and also provides a basis for rapid prediction of tunnel stability when the joint parameters change.
The location of the joints in the rock mass is concealed,and the parameter acquisition is difficult.Investigating the effect of different parameters of joints on the strength of rock mass is helpful to improve the measurement accuracy of joints and to find out the parameters that have the greatest effect on the weakening of the rock mass.Based on the equivalent rock mass technology,the influence of the Discrete Fracture Network(DFN)parameters of jointed rock mass on the uniaxial compressive strength of the Representative Elementary Volume(REV)were studied in Guangshan No.1 tunnel,Yunnan province.These parameters include mean dip angle,standard deviation of dip angle,joint size,the power of joint size distribution,and joint density.The sensitivity of these parameters on rock mass strength was also analyzed.The results show that:the strength of rock mass has the greatest sensitive to the joint mean dip angle.So it is necessary to strengthen the survey of dip angle.Increased joint density has the strongest weakening effect on rock mass strength.When the joint density increases,it is necessary to adjust the construction plan in time and improve the support strength.This study provides a reference for the key points of joint exploration and also provides a basis for rapid prediction of tunnel stability when the joint parameters change.
引文
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[13]KULATILAKE P H S W,UCPIRTI H,WANG S,et al.Use of the distinct element method to perform stress analysis in rock with non-persistent joints and to study the effect of joint geometry parameters on the strength and deformability of rock masses[J].Rock Mechanics and Rock Engineering,1992,25(4):253-274.
[14]包含,常金源,伍法权,等.基于统计岩体力学的岩体强度特征分析[J].岩土力学,2015,36(8):2361-2369.BAO Han,CHANG Jinyuan,WU Faquan,et al.Analysis of strength characteristics of rock mass based on statistical mechanics of rock mass[J].Rock and Soil Mechanics,2015,36(8):2361-2369.
[2]朱万成,张敏思,张洪训,等.节理岩体表征单元体尺寸确定的数值模拟[J].岩土工程学报,2013,35(6):1121-1127.ZHU Wancheng,ZHANG Minsi,ZHANG Hongxun,et al.Numerical simulation for determining the size of representative element volume(REV)of jointed rock mass[J].Chinese Journal of Rock Mechanics and Engineering,2013,35(6):1121-1127
[3]吴顺川,周喻,高利立,等.等效岩体技术在岩体工程中的应用[J].岩石力学与工程学报,2010,29(7):1435-1441.WU Shunchuan,ZHOU Yu,GAO Lili,et al.Application of equivalent rock mass technique to rock mass engineering[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(7):1435-1441.
[4]向文飞,周创兵.裂隙岩体表征单元体研究进展[J].岩石力学与工程学报,2005,24(增2):5686-5692.XIANG Wenfei,ZHOU Chuangbing.The advances in investigation of representative elementary volume for fractured rock mass[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(Sup 2):5686-5692.
[5]吴顺川,周喻,高永涛,等.等效岩体随机节理三维网络模型构建方法研究[J].岩石力学与工程学报,2012,31(增1):3082-3090.WU Shunchuan,ZHOU Yu,GAO Yongtao,et al.Research on construction method of stochastic joints 3Dnetwork model of equivalent rock mass[J].Chinese Journal of Rock Mechanic and Engineering,2012,31(Sup 1):3082-3090.
[6]吴顺川,周喻,高永涛,等.自适应连续体/非连续体周期边界单元耦合技术在等效岩体中的应用研究[J].岩石力学与工程学报,2012,31(增1):3117-3122.WU Shunchuan,ZHOU Yu,GAO Yongtao,et al.Research on application of coupling technique of adaptive continue/discontine periodic boundary cell to equivalent rock mass[J].Chinese Journal of Rock Mechanic and Engineering,2012,31(Sup 1):3117-3122.
[7]ESMAIELI K,HADJIGEORGIOU J,GRENON M.Estimating geometrical and mechanical REV based on synthetic rock mass models at Brunswick Mine[J].International Journal of Rock Mechanics&Mining Sciences,2010,47(6):915-926.
[8]杨建平,陈卫忠,戴永浩.裂隙岩体变形模量尺寸效应研究Ⅰ:有限元法[J].岩土力学,2011,32(5):1538-1545.YANG Jianping,CHEN Weizhong,DAI Yonghao,et al.Study of scale effect of deformation modulus of fractured rock mass-part I:Finite element method[J].Rock and Soil Mechanics,2011,32(5):1538-1545.
[9]HALAKATEVAKIS N,SOFIANOS A I.Strength of a blocky rock mass based on an extended plane of weakness theory[J].International Journal of Rock Mechanics and Mining Sciences,2010,47(4):568-582.
[10]BIDGOLI M N,ZHAO Z,JING L.Numerical evaluation of strength and deformability of fractured rocks[J].Journal of Rock Mechanics and Geotechnical Engineering,2013,5(6):419-430.
[11]赵伟,吴顺川,高永涛,等.节理岩体数值模拟及力学参数确定[J].工程科学学报,2015,37(12):1542-1549.ZHAO Wei,WU Shunchuan,GAO Yongtao,et al.Numerical modeling and mechanical parameters determination of jointed rock mass[J].Chinese Journal of Engineering,2015,37(12):1542-1549.
[12]KHANI A,BAGHBANAN A,HASHEMOLHOSSEINI H.Numerical investigation of the effect of fracture intensity on deformability and REV of fractured rock masses[J].International Journal of Rock Mechanics and Mining Sciences,2013,63:104-112.
[13]KULATILAKE P H S W,UCPIRTI H,WANG S,et al.Use of the distinct element method to perform stress analysis in rock with non-persistent joints and to study the effect of joint geometry parameters on the strength and deformability of rock masses[J].Rock Mechanics and Rock Engineering,1992,25(4):253-274.
[14]包含,常金源,伍法权,等.基于统计岩体力学的岩体强度特征分析[J].岩土力学,2015,36(8):2361-2369.BAO Han,CHANG Jinyuan,WU Faquan,et al.Analysis of strength characteristics of rock mass based on statistical mechanics of rock mass[J].Rock and Soil Mechanics,2015,36(8):2361-2369.