定量化GSI在估计岩体力学参数中的应用研究
|
摘要
Hoek-Brown强度准则在裂隙化岩体中得到了广泛应用。然而,Hoek给出的岩体结构特征和岩体表面状况与地质强度指标(GSI)的概化关系,公路隧道工程中无法根据勘察报告给出围岩指标,建立与GSI的对应关系。鉴于此,必须建立岩体完整系数(K_v)和岩体风化程度系数(K_f)与GSI的定量关系,从而确定Hoek-Brown强度准则中所需要的岩体参数值。利用该方法估计公路隧道围岩的力学参数,将该估算值用于模拟隧道拱顶沉降,得到的模拟值与实际监测结果对比,误差在允许范围之内。通过算例验证该方法确定H-B强度准则中岩体参数的可行性,为公路隧道不同围岩的H-B强度准则岩体参数值的确定提供了新的快速、实用的方法。
Hoek-Brown strength criteria is widely applied in fissure rock-mass,although the qualitative relationship among rock structure characteristics,rock surface condition and Geological Strength Index( GSI) has been offered by E.Hoek,surrounding rock index cannot be provided according to survey report in highway tunnel engineering along with failure to connect with GSI. Therefore,the quantitative relationship among rock complete coefficient( K_v),rock weathering coefficient( K_f) and Geological Strength Index( GSI) was established in order to determine the rock parameters in Hoek-Brown strength criteria. By using this method,the estimates of the surrounding rock mechanical parameters were located within standard ranges. When estimates were applied to simulate the vault settlement of tunnel,the obtained error between simulated and monitored results was within the allowable range. Application of this method validated the feasibility of determining the rock parameters of Hoek-Brown strength criteria,which provides a new practical way to determinate rock mass mechanical parameters of H-B strength criteria for surrounding rock in highway tunnel.
Hoek-Brown strength criteria is widely applied in fissure rock-mass,although the qualitative relationship among rock structure characteristics,rock surface condition and Geological Strength Index( GSI) has been offered by E.Hoek,surrounding rock index cannot be provided according to survey report in highway tunnel engineering along with failure to connect with GSI. Therefore,the quantitative relationship among rock complete coefficient( K_v),rock weathering coefficient( K_f) and Geological Strength Index( GSI) was established in order to determine the rock parameters in Hoek-Brown strength criteria. By using this method,the estimates of the surrounding rock mechanical parameters were located within standard ranges. When estimates were applied to simulate the vault settlement of tunnel,the obtained error between simulated and monitored results was within the allowable range. Application of this method validated the feasibility of determining the rock parameters of Hoek-Brown strength criteria,which provides a new practical way to determinate rock mass mechanical parameters of H-B strength criteria for surrounding rock in highway tunnel.
引文
[1]李守龙,李宗利,黄高峰.Hoek-Brown强度准则在隧道岩体稳定分析中的应用研究[J].长江科学院院报,2014,31(5):43-46.LI Shoulong,LI Zongli,HUANG Gaofeng.Application of Hoek-Brown failure criterion to stability analysis of tunnel rock mass[J].Journal of Yangtze River Scientific Research Institute,2014,31(5):43-46.
[2]符文熹,胡静,廖异,等.基于Hoek-Brown经验公式的岩体稳定性可靠度分析[J].岩土力学,2009,30(增2):214-218.FU Wenxi,HU Jing,LIAO Yi,et al.Reliability analysis of rock mass stability based on Hoek-Brown empirical formulas[J].Rock and Soil Mechanics,2009,30(S2):214
[3]温森,杨圣奇.基于Hoek-Brown准则的隧洞围岩变形研究[J].岩土力学,2011,32(1):63-69.WEN Sen,YANG Shengqi.Study of deformations of surrounding rock of tunnel based on Hoek-Brown criterion[J].Rock and Soil Mechanics,2011,32(1):63-69.
[4]邹琅.山岭公路隧道围岩力学参数估计[J].公路工程,2013,38(2):170-173.ZOU Lang.Estimation of mountain highway tunnel surrounding rock mechanics[J].Highway Engineering,2013,38(2):170-173.
[5]夏开宗,陈从新,刘秀敏,等.基于岩体波速的HoekBrown准则预测岩体力学参数方法及工程应用[J].岩石力学与工程学报,2013,32(7):1458-1466.XIA Kaizong,CHEN Congxin,LIU Xiumin,et al.Estimation of rock mass mechanical parameters based on ultrasonic velocity of rock mass and Hoek-Brown criterion and its application to engineering[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(7):1458-1466.
[6]韩凤山.大体积节理化岩体强度与力学参数[J].岩石力学与工程学报,2004,23(5):777-780.HAN Fengshan.Strength and mechanical parameters of large-volume jointed rockmass[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(5):777-780.
[7]韩凤山.节理化岩体强度与力学参数估计的地质强度指标GSI法[J].大连大学学报,2007,28(6):48-51.HAN Fengshan.Method of geological strength index(GSI)for the estimation of strength and mechanical parameters of jointed rock mass[J].Journal of Dalin University,2007,28(6):48-51.
[8]胡盛明,胡修文.基于量化的GSI系统和Hoek-Brown准则的岩体力学参数的估计[J].岩土力学,2011,32(3):861-866.HU Shengming,HU Xiuwen.Estimation of rock mass parameters based on quantitative GSI system and HoekBrown criterion[J].Rock and Soil Mechanics,2011,32(3):861-866.
[9]杨锋,阮飞鹏.H-B准则在隧道围岩力学参数确定中的应用[J].人民黄河,2012,34(9):103-104.YANG Feng,RUAN Feipeng.Application of Hoek-Brown strength criterion in mechanical parameters determination of rock mass in the road tunnel[J].Yellow River,2012,34(9):103-104.
[10]苏永华,封立志,李志勇,等.Hoek-Brown准则中确定地质强度指标因素的量化[J].岩石力学与工程学报,2009,28(4):679-686.SU Yonghua,FENG Lizhi,LI Zhiyong,et al.Quantification of elements for geological strength index in HiekBrown criterion[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(4):679-686.
[11]JTG D70——2004,公路隧道设计规范[S].JTG D70——2004,Code for Design of Road Tunnel[S].
[12]HOEK E,BROWN E T.Practical estimates of rock mass strength[J].International Journal of Rock Mechanics and Mining Sciences,1997,34(8):1165-1186.
[13]HOEK E.Strength of rock and rock masses[J].International Society for Rock Mechanics News Journal,1994,2(2):4-16.
[14]HOEK E,KAISER P K,BAWDEN W F.Support of underground excavations in hard rock[M].Rotterdam:A.A.Balkema,1995:99.
[15]朱合华,张琦,章连洋.Hoek-Brown强度准则研究进展与应用综述[J].岩石力学与工程学报,2013,32(10):1945-1962.ZHU Hehua,ZHANG Qi,ZHANG Lianyang.Review of research progresses and applications of Hoek-Brown strength criterion[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(10):1945-1962.
[2]符文熹,胡静,廖异,等.基于Hoek-Brown经验公式的岩体稳定性可靠度分析[J].岩土力学,2009,30(增2):214-218.FU Wenxi,HU Jing,LIAO Yi,et al.Reliability analysis of rock mass stability based on Hoek-Brown empirical formulas[J].Rock and Soil Mechanics,2009,30(S2):214
[3]温森,杨圣奇.基于Hoek-Brown准则的隧洞围岩变形研究[J].岩土力学,2011,32(1):63-69.WEN Sen,YANG Shengqi.Study of deformations of surrounding rock of tunnel based on Hoek-Brown criterion[J].Rock and Soil Mechanics,2011,32(1):63-69.
[4]邹琅.山岭公路隧道围岩力学参数估计[J].公路工程,2013,38(2):170-173.ZOU Lang.Estimation of mountain highway tunnel surrounding rock mechanics[J].Highway Engineering,2013,38(2):170-173.
[5]夏开宗,陈从新,刘秀敏,等.基于岩体波速的HoekBrown准则预测岩体力学参数方法及工程应用[J].岩石力学与工程学报,2013,32(7):1458-1466.XIA Kaizong,CHEN Congxin,LIU Xiumin,et al.Estimation of rock mass mechanical parameters based on ultrasonic velocity of rock mass and Hoek-Brown criterion and its application to engineering[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(7):1458-1466.
[6]韩凤山.大体积节理化岩体强度与力学参数[J].岩石力学与工程学报,2004,23(5):777-780.HAN Fengshan.Strength and mechanical parameters of large-volume jointed rockmass[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(5):777-780.
[7]韩凤山.节理化岩体强度与力学参数估计的地质强度指标GSI法[J].大连大学学报,2007,28(6):48-51.HAN Fengshan.Method of geological strength index(GSI)for the estimation of strength and mechanical parameters of jointed rock mass[J].Journal of Dalin University,2007,28(6):48-51.
[8]胡盛明,胡修文.基于量化的GSI系统和Hoek-Brown准则的岩体力学参数的估计[J].岩土力学,2011,32(3):861-866.HU Shengming,HU Xiuwen.Estimation of rock mass parameters based on quantitative GSI system and HoekBrown criterion[J].Rock and Soil Mechanics,2011,32(3):861-866.
[9]杨锋,阮飞鹏.H-B准则在隧道围岩力学参数确定中的应用[J].人民黄河,2012,34(9):103-104.YANG Feng,RUAN Feipeng.Application of Hoek-Brown strength criterion in mechanical parameters determination of rock mass in the road tunnel[J].Yellow River,2012,34(9):103-104.
[10]苏永华,封立志,李志勇,等.Hoek-Brown准则中确定地质强度指标因素的量化[J].岩石力学与工程学报,2009,28(4):679-686.SU Yonghua,FENG Lizhi,LI Zhiyong,et al.Quantification of elements for geological strength index in HiekBrown criterion[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(4):679-686.
[11]JTG D70——2004,公路隧道设计规范[S].JTG D70——2004,Code for Design of Road Tunnel[S].
[12]HOEK E,BROWN E T.Practical estimates of rock mass strength[J].International Journal of Rock Mechanics and Mining Sciences,1997,34(8):1165-1186.
[13]HOEK E.Strength of rock and rock masses[J].International Society for Rock Mechanics News Journal,1994,2(2):4-16.
[14]HOEK E,KAISER P K,BAWDEN W F.Support of underground excavations in hard rock[M].Rotterdam:A.A.Balkema,1995:99.
[15]朱合华,张琦,章连洋.Hoek-Brown强度准则研究进展与应用综述[J].岩石力学与工程学报,2013,32(10):1945-1962.ZHU Hehua,ZHANG Qi,ZHANG Lianyang.Review of research progresses and applications of Hoek-Brown strength criterion[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(10):1945-1962.