地质构造和地形对N.Barton岩质评定系数Q值的影响分析
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摘要
挪威岩土所Barton等人给出的岩质评定系数Q值计算式,从岩体的完整性、结构面发育程度、地下水和地应力的影响等方面,全面地反映了岩体的工程地质状况和水文地质状况,定量地反映了围岩质量的好坏,但对宏观地质构造及地形地貌的影响考虑相对较少。文章通过理论分析和数值计算,提出了三个修正系数,即褶皱影响系数Kfo、断层影响系数Kfa以及地形影响系数Ktf,并针对具体工程给出了相应的取值范围,对Q值进行了修正,反应了工程地质构造、地形地貌对Q值的影响程度,使其表达更为准确。
The rock assessment system of Q and the Q formula proposed by Barton et al.represent the engineering geological and hydrogeological conditions of surrounding rocks in terms of rock integrity,development of a structural plane,and groundwater and crustal stress.One shortcoming of the system,however,is its lack of consideration regarding the effects of macroscopic geologic structures and topographic features.Based on theoretical analysis and numerical simulation,this paper puts forward three correction factors,i.e.the fold coefficient Kfo,fault coefficient Kfa and topographical coefficient Ktf,and gives a specific range of values to correct the Q value in regards to a concrete project,which reflects the effects of engineering geologic structures and topographic features on the Q value.
The rock assessment system of Q and the Q formula proposed by Barton et al.represent the engineering geological and hydrogeological conditions of surrounding rocks in terms of rock integrity,development of a structural plane,and groundwater and crustal stress.One shortcoming of the system,however,is its lack of consideration regarding the effects of macroscopic geologic structures and topographic features.Based on theoretical analysis and numerical simulation,this paper puts forward three correction factors,i.e.the fold coefficient Kfo,fault coefficient Kfa and topographical coefficient Ktf,and gives a specific range of values to correct the Q value in regards to a concrete project,which reflects the effects of engineering geologic structures and topographic features on the Q value.
引文
[1]Norwegian Tunnelling Society.Norwegian Tunnelling Publication No.14,2004
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[3]关宝树.隧道工程设计要点集[M].北京:人民交通出版社,2003 Guan Baoshu.Collection of Key Points in Construction of Tunnel Projects[M].Beijing:China Communications Press,2003
[4]王建宇.隧道工程的技术进步[M].北京:中国铁道出版社,2004 Wang Jianyu.Technical Progress in Tunnel Engineering[M].Beijing:China Railway Publishing House,2004
[5]孙广忠.地质工程理论与实践[M].北京:地震出版社,1996 Sun Guangzhong.Theory and Practice of Geological Engineering[M].Beijing:Seismological Press,1996
[6]Hudson J.A.and Cooling C.M.1988.In Situ Rock Stresses and Their Measurement in the UK-Part I,the Current State of Knowledge.Int.J.Rock Mech.Min.Sci.&Geomech.Abstr.25,363-370
[7]苏生瑞,黄润秋,王士天.断裂构造对地应力场的影响及其工程应用[M].北京:科学出版社,2002 Su Shengrui,Huang Runqiu,Wang Shitian.Effect of Fracture Formation on Ground Stress Field and Its Engineering Application[M].Beijing:Science Press,2002
[2]张俊儒,仇文革.隧道单层衬砌研究现状及评述[J].地下空间与工程学报,2006,2(4):693-699 Zhang Junru,Qiu Wenge.Present Status and Comment of Tunnel Single Shell Lining Study[J].Chinese Journal of Underground Space and Engineering,2006,2(4):693-699
[3]关宝树.隧道工程设计要点集[M].北京:人民交通出版社,2003 Guan Baoshu.Collection of Key Points in Construction of Tunnel Projects[M].Beijing:China Communications Press,2003
[4]王建宇.隧道工程的技术进步[M].北京:中国铁道出版社,2004 Wang Jianyu.Technical Progress in Tunnel Engineering[M].Beijing:China Railway Publishing House,2004
[5]孙广忠.地质工程理论与实践[M].北京:地震出版社,1996 Sun Guangzhong.Theory and Practice of Geological Engineering[M].Beijing:Seismological Press,1996
[6]Hudson J.A.and Cooling C.M.1988.In Situ Rock Stresses and Their Measurement in the UK-Part I,the Current State of Knowledge.Int.J.Rock Mech.Min.Sci.&Geomech.Abstr.25,363-370
[7]苏生瑞,黄润秋,王士天.断裂构造对地应力场的影响及其工程应用[M].北京:科学出版社,2002 Su Shengrui,Huang Runqiu,Wang Shitian.Effect of Fracture Formation on Ground Stress Field and Its Engineering Application[M].Beijing:Science Press,2002
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