基于关键块体理论的岩体稳定性分析方法及其在三峡工程中的应用
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摘要
针对三峡工程船闸边坡、地下厂房等岩石工程建设中面临的复杂岩体结构块体稳定性问题,阐述了引进岩体关键块体理论解决工程实际问题的关键技术及过程。以关键块体理论为基础,提出任意形状块体的体积计算、凹形块体几何构型以及考虑一般水压模式条件下的块体水载荷计算等一系列方法,实现了复杂岩体地质结构面切割条件下的关键块体识别及多种载荷组合下的关键块体稳定性评价,并应用于三峡船闸边坡及三峡地下厂房等多个工程部位岩体稳定性分析与支护评价。三峡船闸边坡施工期数百个块体几何构型及稳定性分析结果表明关键块体稳定性分析结论与现场实际块体出露特征和稳定状态总体相符。所提出的基于关键块体理论的岩体稳定性分析方法具有较好的针对性和实用性,可为其他工程岩体稳定性分析提供理论依据。
Some key technologies of applying the key block theory in engineering practice are presented to address the stability issue of complex rock blocks involved in the construction of ship lock slope and underground power house of the Three Gorges Project( TGP). Such technologies include the calculation of block volume with any shape,the geometric configuration of a particular type of concave block,and the calculation of water pressure under the general distribution loading condition. By applying these methods to the rock stability analysis and reinforcement evaluation in the shiplock slopes and the underground powerhouse of TGP,key blocks can be identified under the condition of cutting of complex rock mass geological discontinuities,and the stability of key blocks under various load combinations can be evaluated. Applications to the geometric configuration and stability analysis of hundreds of blocks in the construction period of the ship lock slope excavation of TGP demonstrate that the results of stability analysis are roughly consistent with the actual characteristics of exposed blocks and their stability state on site. In conclusion,the methods of rock mass stability analysis based on key block theory proposed in this paper are of good pertinence and practicability,and offer theoretical basis for the rock stability analysis of other projects.
Some key technologies of applying the key block theory in engineering practice are presented to address the stability issue of complex rock blocks involved in the construction of ship lock slope and underground power house of the Three Gorges Project( TGP). Such technologies include the calculation of block volume with any shape,the geometric configuration of a particular type of concave block,and the calculation of water pressure under the general distribution loading condition. By applying these methods to the rock stability analysis and reinforcement evaluation in the shiplock slopes and the underground powerhouse of TGP,key blocks can be identified under the condition of cutting of complex rock mass geological discontinuities,and the stability of key blocks under various load combinations can be evaluated. Applications to the geometric configuration and stability analysis of hundreds of blocks in the construction period of the ship lock slope excavation of TGP demonstrate that the results of stability analysis are roughly consistent with the actual characteristics of exposed blocks and their stability state on site. In conclusion,the methods of rock mass stability analysis based on key block theory proposed in this paper are of good pertinence and practicability,and offer theoretical basis for the rock stability analysis of other projects.
引文
[1]石根华.岩体稳定分析的赤平投影方法[J].中国科学,1977,(3):260-271.
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[9]WU Ai-qing,HUANG Zheng-jia.Stability Analysis for Rock Blocks in Three Gorges Project[C]∥HATZOR Y H.Stability of Rock Structures.Proceedings of the 5th International Conference on Analysis of Discontinuous Deformation.Beer Sheva,Israel,October 6-10,2002:95-100.
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[11]盛谦,黄正加,邬爱清.三峡工程地下厂房地位块体分析与厂房轴线选择[J].岩石力学与工程学报,2002,21(增刊):1958-1961.
[12]黄正加,周述达,林学峰,等.三峡洞室围岩定位块体稳定性分析[J].矿山压力与顶板管理,2005,(3):76-79.
[13]董学晟,田野,邬爱清.水工岩石力学[M].北京:水利水电出版社,2004:246-249.
[14]张奇华,邬爱清.基于凹形区分类的块体几何形态分析方法[J].岩土工程学报,2005,27(3):299-303.
[15]张奇华.基于块体加与块体减算法的岩石块体几何形态分析[J].水利学报,2006,37(4):418-424.
[16]HOEK E,BRAY J W.Rock Slope Engineering[M].Edition 4.London and New York:Taylor&Francis Group,2003:11-14.
[17]LONDE P.Une Méthode d'analyseàTrois Dimensions de la Stabilitéd'une Rive Rocheuse[J].Annales des Ponts et Chaussées,1965,1:37.
[18]邬爱清.裂隙岩体模拟与块体系统稳定性分析方法及应用研究[D].武汉:武汉大学,2006.
[2]GOODMAN R E,SHI Gen-hua.Block Theory and Its Application to Rock Engineering[M].Englewood Cliffs,New Jersey:Prentice-hall Inc.,1985.
[3]董学晟.地下厂房围岩稳定分析若干问题探讨[J].岩土工程学报,1981,3(2):51-56.
[4]董学晟,邬爱清,郭熙灵.三峡工程岩石力学研究50年[J].岩石力学与工程学报,2008,27(10):1945-1958.
[5]邬爱清.岩坡关键块体的概率分析[J].长江科学院院报,1988,5(2):66-76.
[6]任放.三峡枢纽船闸高边坡岩石切割体的几何构型与锚固基础[J].长江科学院院报,1988,5(4):1-11.
[7]邬爱清,任放,郭玉.节理岩体开挖面上块体随机分布及锚固方式研究[J].长江科学院院报,1991,8(4):27-34.
[8]邬爱清,朱虹,李信广.一种考虑块体侧面一般水压分布模式下的块体稳定性计算方法[J].岩石力学与工程学报,2000,19(增刊):936-940.
[9]WU Ai-qing,HUANG Zheng-jia.Stability Analysis for Rock Blocks in Three Gorges Project[C]∥HATZOR Y H.Stability of Rock Structures.Proceedings of the 5th International Conference on Analysis of Discontinuous Deformation.Beer Sheva,Israel,October 6-10,2002:95-100.
[10]黄正加,邬爱清,盛谦.块体理论在三峡工程中的应用研究[J].岩石力学与工程学报,2001,20(5):648-652.
[11]盛谦,黄正加,邬爱清.三峡工程地下厂房地位块体分析与厂房轴线选择[J].岩石力学与工程学报,2002,21(增刊):1958-1961.
[12]黄正加,周述达,林学峰,等.三峡洞室围岩定位块体稳定性分析[J].矿山压力与顶板管理,2005,(3):76-79.
[13]董学晟,田野,邬爱清.水工岩石力学[M].北京:水利水电出版社,2004:246-249.
[14]张奇华,邬爱清.基于凹形区分类的块体几何形态分析方法[J].岩土工程学报,2005,27(3):299-303.
[15]张奇华.基于块体加与块体减算法的岩石块体几何形态分析[J].水利学报,2006,37(4):418-424.
[16]HOEK E,BRAY J W.Rock Slope Engineering[M].Edition 4.London and New York:Taylor&Francis Group,2003:11-14.
[17]LONDE P.Une Méthode d'analyseàTrois Dimensions de la Stabilitéd'une Rive Rocheuse[J].Annales des Ponts et Chaussées,1965,1:37.
[18]邬爱清.裂隙岩体模拟与块体系统稳定性分析方法及应用研究[D].武汉:武汉大学,2006.