基于岩体质量指标Q分类系统的风险分析方法
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摘要
基于岩体质量指标Q分类系统,应用Monte-Carlo模拟技术,研究了岩体质量风险分析方法。该方法视Q分类系统中各单因素取值为随机变量,建立了各单因素取值概率模型;通过对所建模型的抽样计算,可获取所评价岩体实际Q值小于设计所采用Q值的概率;通过对比分析Q值累计曲线和岩体质量分布图,可得到任意Q值对应的风险概率,查清岩体中可能出现的质量等级以及每个质量等级所占百分比的情况。本文研究成果已在青岛胶州湾海底隧道工程中得到应用,并获得良好效果。
A risk analysis method in rock mass quality classification based on Q system was studied,by using Monte-Carlo simulation technique in this article.All factors in Q system are treated as random variables in this method.By using the probabilistic models of these factors,the probability of the case that the Q value of the rock mass is poorer than that used in the design is adopted. The risk probability of each Q value,the grade of rock mass quality which may be appeared in rock mass and the percent of each grade can be got by analyzing Q value cumulative cure and rock mass quality distribution chart,which was proposed in this article.This method acquired good results in application to the Qingdao Jiao Zhou Bay cross-harbor tunnel project.
A risk analysis method in rock mass quality classification based on Q system was studied,by using Monte-Carlo simulation technique in this article.All factors in Q system are treated as random variables in this method.By using the probabilistic models of these factors,the probability of the case that the Q value of the rock mass is poorer than that used in the design is adopted. The risk probability of each Q value,the grade of rock mass quality which may be appeared in rock mass and the percent of each grade can be got by analyzing Q value cumulative cure and rock mass quality distribution chart,which was proposed in this article.This method acquired good results in application to the Qingdao Jiao Zhou Bay cross-harbor tunnel project.
引文
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[7]章杨松,罗国煜,阎长虹.岩石质量描述图与岩石质量风险分析探讨[J].地质论评,2001,47(2):146-150.Zhang Y S,Luo G Y,Yang C H.Discussion of thedescription chart of rock quality and risk analysis ofrock quality[J].Geological Review,2001,47(2):146-150.
[8]Sen Z.RQP,RQR and fracture spacing[J].International Journal of Rock Mechanics and MiningSciences&Geomechanics Abstracts,1990,27(3):135-137.
[9]杜时贵,许四法,杨树峰,等.岩石质量指标RQD与工程岩体分类[J].工程地质学报,2000,8(3):351-356.Du S G,Xu S F,Yang S F,et al.Application of rockquality designation(RQD)to engineering classi-fication of rocks[J].Engineering Geology,2000,8(3):351-356.
[10]Arild P,Einar B.Use and misuse of rock massclassification systems with particular reference to theQ-system[J].Tunneling and Underground SpaceTechnology,2006,21(6):575-593.
[11]陈昌彦,王贵荣.各类岩体质量评价方法的相关性探讨[J].岩石力学与工程学报,2002,21(12):1894-1900.Chen C Y,Wang G R.Discussion on the interrelationof various rock mass quality classification systems athome and abroad[J].Chinese Journal of RockMechanics and Engineering,2002,21(12):1894-1900.
[12]Goodman R E.RQD and fracture spacing[J].Journalof the Geotechnical Engineering Division.ASCE,1980,106(1):191-193.
[13]杜时贵.岩体结构面的工程性质[M].北京:地震出版社,1999.Du S G.Engineering Behavior of Discontinuities inRock Mass[M].Beijing:Seismological Press,1999.
[14]Priest S D,Hudson J A.Discontinuity spacing in rock[J].International Journal of Rock Mechanics andMining Sciences,1976,13(10):135-148.
[15]Steffen O K H,Jennings J E.Recent developments inthe interpretation of data from joint surveys in rockmasses[C]∥Proceeding of 6thRegional Conferencefor Africa on Soil Mechanics and FoundationEngineering.Durban:[s.n.],1975.17-26.
[16]Priest S D,Hudson J A.Estimation of discontinuityspacing and trace length using scan line survey[J].International Journal of Rock Mechanics and MiningSciences,1981,18(3):183-197.
[2]李攀峰,张倬元,陶连金.岩体质量对地下工程开挖效应的影响研究[J].地质灾害与环境保护,2004,15(3):82-86.Li P F,Zhang Z Y,Tao L J.Study on the rock massqualities influences on the excavation effects ofunderground project[J].Journal of GeologicalHazards and Environment Preservation,2004,15(3):82-86.
[3]刘佑荣,唐辉明.岩体力学[M].武汉:中国地质大学出版社,1999.Liu Y R,Tang H M.Rock Mass Mechanics[M].Wuhan:China University of Geosciences Press,1999.
[4]章杨松.岩体质量分级的风险分析方法[J].工程地质学报,2002,10(3):331-336.Zhang Y S.A risk analysis method in rock massquality classification[J].Journal of EngineeringGeology,2002,10(3):331-336.
[5]章杨松.岩体质量分级风险分析方法及岩体力学参数研究——以镇江至扬州长江公路大桥为例[D].南京:南京大学,1999.Zhang Y S.Risk analysis method for classification ofrock masses quality study on mechanical parameters ofrock masses—a case of Zhenjiang-Yangzhou YANG-ZE River highway bridge project[D].Nanjing:NanjingUniversity,1999.
[6]付正飞,张世飚,郭刚,等.概率论方法在云岭隧道围岩分类中的应用研究[J].岩石力学与工程学报,2006,25(增1):3063-3068.Fu Z F,Zhang S B,Guo G,et al.Study onapplication of probability method to surrounding rockclassification in YunLing tunnel[J].Chinese Journalof Rock Mechanics and Engineeting,2006,25(S1):3063-3068.
[7]章杨松,罗国煜,阎长虹.岩石质量描述图与岩石质量风险分析探讨[J].地质论评,2001,47(2):146-150.Zhang Y S,Luo G Y,Yang C H.Discussion of thedescription chart of rock quality and risk analysis ofrock quality[J].Geological Review,2001,47(2):146-150.
[8]Sen Z.RQP,RQR and fracture spacing[J].International Journal of Rock Mechanics and MiningSciences&Geomechanics Abstracts,1990,27(3):135-137.
[9]杜时贵,许四法,杨树峰,等.岩石质量指标RQD与工程岩体分类[J].工程地质学报,2000,8(3):351-356.Du S G,Xu S F,Yang S F,et al.Application of rockquality designation(RQD)to engineering classi-fication of rocks[J].Engineering Geology,2000,8(3):351-356.
[10]Arild P,Einar B.Use and misuse of rock massclassification systems with particular reference to theQ-system[J].Tunneling and Underground SpaceTechnology,2006,21(6):575-593.
[11]陈昌彦,王贵荣.各类岩体质量评价方法的相关性探讨[J].岩石力学与工程学报,2002,21(12):1894-1900.Chen C Y,Wang G R.Discussion on the interrelationof various rock mass quality classification systems athome and abroad[J].Chinese Journal of RockMechanics and Engineering,2002,21(12):1894-1900.
[12]Goodman R E.RQD and fracture spacing[J].Journalof the Geotechnical Engineering Division.ASCE,1980,106(1):191-193.
[13]杜时贵.岩体结构面的工程性质[M].北京:地震出版社,1999.Du S G.Engineering Behavior of Discontinuities inRock Mass[M].Beijing:Seismological Press,1999.
[14]Priest S D,Hudson J A.Discontinuity spacing in rock[J].International Journal of Rock Mechanics andMining Sciences,1976,13(10):135-148.
[15]Steffen O K H,Jennings J E.Recent developments inthe interpretation of data from joint surveys in rockmasses[C]∥Proceeding of 6thRegional Conferencefor Africa on Soil Mechanics and FoundationEngineering.Durban:[s.n.],1975.17-26.
[16]Priest S D,Hudson J A.Estimation of discontinuityspacing and trace length using scan line survey[J].International Journal of Rock Mechanics and MiningSciences,1981,18(3):183-197.
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