某抽水蓄能电站地下洞室围岩岩体质量特征分析
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摘要
采用BQ和Q两种岩体质量分级系统对某抽水蓄能电站地下厂房围岩岩体质量进行分级,并指明了岩体质量较差部位,结果表明,该地下洞室围岩岩体质量等级以Ⅱ级、Ⅲ级为主。根据勘探平洞洞壁波速测试结果发现:Ⅱ级、Ⅲ级围岩岩体波速为4200～5300m.s-1,相应平洞岩体自稳性好,Ⅳ级、Ⅴ级围岩波速一般小于4000m.s-1,特别是Ⅴ级围岩波速一般小于2200m.s-1。根据对不同分级法得到的岩体质量指标相关性分析结果表明,两种分级法得到的岩体质量指标之间呈指数关系,波速-[BQ]呈线性关系。对同一工程,岩体质量评价的两种分级方法所得的分级结果不同,但是它们的分级基础是相似的,即都以地质因素为主导,因此各种分级方法之间是可以换算和对比的。
The rock mass quality surrounding the underground plant of a pumped storage station is classified with BQ and Q classification systems.The distribution of rock masses with poor quality is pointed out.The results indicate that the rock mass quality is commonly at the gradeⅡor Ⅲ.On the other hand,the result of wave velocity testing shows that the wave velocity of the rock mass of gradeⅡor Ⅲ is between 4200~5300 m·s-1,and these rock mass has good stability.However,the wave velocity of the grade Ⅳand Ⅴ is less than 4000 m·s-1.Especially,the rock mass wave of the grade Ⅴ is less than 2200 m·s-1.The rock mass quality indices from the two classification systems have similarities.The two indices have the relationship of exponential function.The relation between wave velocity and [BQ] is linear.For the same project,the classification results from the two classification systems are different,but the classification bases are similar,which are dominated by the geological elements.So,there are the methods for conversion and comparison between the two classification systems.
The rock mass quality surrounding the underground plant of a pumped storage station is classified with BQ and Q classification systems.The distribution of rock masses with poor quality is pointed out.The results indicate that the rock mass quality is commonly at the gradeⅡor Ⅲ.On the other hand,the result of wave velocity testing shows that the wave velocity of the rock mass of gradeⅡor Ⅲ is between 4200~5300 m·s-1,and these rock mass has good stability.However,the wave velocity of the grade Ⅳand Ⅴ is less than 4000 m·s-1.Especially,the rock mass wave of the grade Ⅴ is less than 2200 m·s-1.The rock mass quality indices from the two classification systems have similarities.The two indices have the relationship of exponential function.The relation between wave velocity and [BQ] is linear.For the same project,the classification results from the two classification systems are different,but the classification bases are similar,which are dominated by the geological elements.So,there are the methods for conversion and comparison between the two classification systems.
引文
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[8]王辉.用于岩体质量评价的地震波Q值计算方法[J].工程地质学报,2006,14(5):699～702.Wang Hui.Computational methods of seismicQvalues for evalua-tion of rock mass quality.Journal of Engineering Geology,2006,14(5):699～702.
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[10]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 Changyan,Wang Guirong.Discussion on the Interrelation of various rock mass quality classification systems at home and a-broad.Chinese Journal of Rock Mechanics and Engineering,2002,21(12):1894～1900.
[2]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 Changyan,Wang Guirong.Discussion on the Interrelation of various rock mass quality classification systems at home and a-broad.Chinese Journal of Rock Mechanics and Engineering,2002,21(12):1894～1900.
[3]徐卫亚,谢守益,蒋晗等.清江水布垭水电站地下厂房岩体质量评价及反馈设计研究[J].工程地质学报,2000,8(2):191～196.Xu Weiya,Xie Shouyi,Jiang Han,et al..Quality assessment of rock mass and feedback design for underground buildings of Shuibuya Hydropower plant.Journal of Engineering Geology,2000,8(2):191～196.
[4]钟登华,李明超,王刚,王义锋.基于三维地层模型的岩体质量可视化分级[J].岩土力学,2005,26(1):11～16.Zhong Denghua1,Li Mingchao,Wang Gang,Wang Yifeng.Visu-alization of rock mass quality classification based on3D strata mod-el.Rock and Soil Mechanics,2005,26(1):11～16.
[5]曹文贵,张永杰.地下结构岩体质量分类的变权重二级模糊综合评判方法研究[J].岩石力学与工程学报,2002,21(12):1612～1619.Cao Wengui,Zhang Yongjie.Study on two-stage fuzzy synthetic judgment method with changing weight value for rock quality clas-sification in underground structures.Chinese Journal of Rock Me-chanics and Engineering,2002,21(12):1612～1619.
[6]周火明,肖国强,阎生存等.岩体质量评价在清江水布垭面板坝趾板建基岩体验收中的应用[J].岩石力学与工程学报,2005,24(2):3737～3741.Zhou Huoming,Xiao Guoqiang,Yan Shengcun,et al..Application of evaluation of rock mass quality to acceptance of toe-slab of Shuibuya concrete faced rock fill dam on Qingjiang River.Chinese Journal of Rock Mechanics and Engineering,2005,24(2):3737～3741.
[7]汪斌,唐辉明,简文星,张显书.结构面三维网络模拟在岩体质量评价中的应用[J].岩土力学,2006,27(4):594～596.Wang Bin,Tang Huiming,Jiao Wenxing,Zhang Xianshu.Appli-cation of3D network modeling rock mass discontinuities to evalua-ting rock mass quality for dam foundation.Rock and Soil Mechan-ics,2006,27(4):594～596.
[8]王辉.用于岩体质量评价的地震波Q值计算方法[J].工程地质学报,2006,14(5):699～702.Wang Hui.Computational methods of seismicQvalues for evalua-tion of rock mass quality.Journal of Engineering Geology,2006,14(5):699～702.
[9]闫莫明,徐祯祥,苏自约.岩土锚固技术手册[M].北京:人民交通出版社,2004.Yan Moming,Xu Zhenxiang,Su Ziyue.Technical manual of geotechnical anchorage.Beijing:China Communications Press,2004.
[10]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 Changyan,Wang Guirong.Discussion on the Interrelation of various rock mass quality classification systems at home and a-broad.Chinese Journal of Rock Mechanics and Engineering,2002,21(12):1894～1900.
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