大型地下洞室群关键块体地震响应分析
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摘要
基于块体理论,针对地下厂房围岩中的关键块体,采用Newmark法进行了地震响应特征和稳定性评价方法的研究,研究表明,三向地震荷载组合作用下,在块体上引起的数值较大、作用时间很短的惯性力是关键块体产生永久位移的根本原因。块体在不同烈度地震荷载作用下其响应特征不只发生量的变化,还有运动规律、模式方面的变化。研究还发现,关键块体地震响应特征与其几何特征存在一定的相关性,并由此建立了大型地下洞室群围岩地震稳定分析的多因素、多指标评判方法。最后考虑结构面的退化效应,研究了块体地震响应特征关于结构面强度参数的敏感性,获得了一些有益的结论。
Based on the block theory and Newmark sliding block method,seismic response and stability of key block in large underground opening group are studied.It is found that inertia force of the key block which acting with short time and large force leads to generation of permanent displacement under three-direction seismic loads,and seismic loads with different intensities cause the key block not only quantitative change of seismic response but also motion regularity and patterns.The result also shows that seismic response characteristics is related to the depth and volume of key blocks through statistic analysis;and seismic stability evaluation method considering multiple factor and indexes is established according to key blocks in large underground opening group.Finally,seismic response of the key block is studied considering cyclic degradation of structure plane strength;and some beneficial conclusions are drawn.
Based on the block theory and Newmark sliding block method,seismic response and stability of key block in large underground opening group are studied.It is found that inertia force of the key block which acting with short time and large force leads to generation of permanent displacement under three-direction seismic loads,and seismic loads with different intensities cause the key block not only quantitative change of seismic response but also motion regularity and patterns.The result also shows that seismic response characteristics is related to the depth and volume of key blocks through statistic analysis;and seismic stability evaluation method considering multiple factor and indexes is established according to key blocks in large underground opening group.Finally,seismic response of the key block is studied considering cyclic degradation of structure plane strength;and some beneficial conclusions are drawn.
引文
[1]刘锦华,吕祖晰.块体理论在工程岩体稳定分析中的应用[M].北京:水利电力出版社,1986.
[2]陈健云,胡志强,林皋.大型地下结构三维地震响应特点研究[J].大连理工大学学报,2003,43(3):344-348.CHEN Jian-yun,HU Zhi-qiang,LIN Gao.Study of3-D seismic response characteristics of large underground structures[J].Journal of Dalian University of Technology,2003,43(3):344-348.
[3]王明华,杨良策,刘汉超,等.大型地下洞室顶板稳定性的岩体结构控制效应[J].岩土力学,2003,24(3):484-487.WANG Ming-hua,YANG Liang-ce,LIU Han-chao,et al.Control effect of rock mass structure on stability of top slab for large underground cavern[J].Rock and Soil Mechanics,2003,24(3):484-487.
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[5]HOERGER S.Probabilistic and Deterministic key block analyses for excavation design[D].Michigan:Michigan Technological University,1988.
[6]盛谦,黄正加,邬爱清.三峡工程地下厂房随机块体稳定性分析[J].岩土力学,2002,(6):82-84,88.SHENG Qian,HUANG Zheng-jia,WU Ai-qing.Stability analysis for random key block of underground power house of Three Gorges Project[J].Rock and Soil Mechanics,2002,(6):82-84,88.
[7]巨能攀,黄润秋,许模,等.某水电站地下洞室随机块体稳定性评价及系统锚固设计[J].工程地质学报,2004,2:97-103.JU Neng-pan,HUANG Run-qiu,XU Mo,et al.Stability evaluation of random blocks and design of systematic anchoring for the underground caverns in a hydropower station[J].Journal of Engineering Geology,2004,2:97-103.
[8]NEWMARK N M.Effects of earthquakes on dams and embankments[J].Geotechnique,1965,15(2):139-160.
[9]SEED H B.Consideration in the earthquake design of earth and rockfill dams[J].Geotechnique,1979,29(3):215-263.
[10]MAKDISI F I,SEED H B.Simplified procedure for estimating dam and embankment earthquake induced deformations[J].Journal of Geotechnical Engineering,ASCE1978,104(GT7):849-867.
[11]刘汉东.考虑地震历时影响的岩质边坡楔体稳定性分析与计算[J].华北水利水电学院学报,1991,4:35-40.LIU Han-dong.Analysis and computation of sliding wedge in rockmass considered influence of earthquake historical time[J].Journal of North China Institute of Water Conservancy and Hydroelectric Power,1991,(4):35-40.
[12]王思敬,薛守义.岩体边坡楔形体动力学分析[J].地质科学,1992,(2):177-182.WANG Si-jing,XUE Shou-yi.Dynamic analysis of wedge sliding on rock slopes[J].Scientia Geologica Sinica,1992,(2):177-182.
[13]薛守义,王思敬,刘建中.块状岩体边坡地震滑动位移分析[J].工程地质学报,1997,5(2):131-136.XUE Shou-yi,WANG Si-jing,LIU Jian-zhong.Analysis of sliding displacements of rockmass on slopes earthquske[J].Journal of Engineering Geology,1997,5(2):131-136.
[14]PAUL B,THOMAS T,PETER M,et al.Structural and hydrogeological characterization of the excavation disturbed zone in the Opalinus Clay(Mont Terri Project,Switzerland)[J].Applied Clay Science,2004,1-20
[15]SHENG Q,YUE Z Q,LEE C F,et al.Estimating the excavation disturbed zone in the slopes of the Three Gorges Project China[J].Int.J.Rock Mech.Min.Sci.,2002,39:165-184.
[16]肖明,龚玉锋,俞裕泰.西龙池抽水蓄能电站地下厂房围岩稳定三维非线性分析[J].岩石力学与工程学报,2000,19(5):557-561.XIAO Ming,GONG Yu-feng,YU Yu-tai.Three dimensional stability analysis on surrouding rock of underground house of Xilongchi pumped storage hydro-power station[J].Chinese Journal of Rock Mechanics and Engineering,2000,19(5):557-561.
[17]祁生文.考虑结构面退化的岩质边坡地震永久位移研究[J].岩土工程学报,2007,(3):452-457.QI Sheng-wen.Evaluation of the permanent displacement of rock mass slope considering deterioration of slide surface during earthquake[J].Chinese Journal of Geotechnical Engineering,2007,(3):452-457.
[2]陈健云,胡志强,林皋.大型地下结构三维地震响应特点研究[J].大连理工大学学报,2003,43(3):344-348.CHEN Jian-yun,HU Zhi-qiang,LIN Gao.Study of3-D seismic response characteristics of large underground structures[J].Journal of Dalian University of Technology,2003,43(3):344-348.
[3]王明华,杨良策,刘汉超,等.大型地下洞室顶板稳定性的岩体结构控制效应[J].岩土力学,2003,24(3):484-487.WANG Ming-hua,YANG Liang-ce,LIU Han-chao,et al.Control effect of rock mass structure on stability of top slab for large underground cavern[J].Rock and Soil Mechanics,2003,24(3):484-487.
[4]CHAN L.Application of block theory and simulation techniques to optimum design of rock excavation[D].Michigan:Michigan Technological University,1986.
[5]HOERGER S.Probabilistic and Deterministic key block analyses for excavation design[D].Michigan:Michigan Technological University,1988.
[6]盛谦,黄正加,邬爱清.三峡工程地下厂房随机块体稳定性分析[J].岩土力学,2002,(6):82-84,88.SHENG Qian,HUANG Zheng-jia,WU Ai-qing.Stability analysis for random key block of underground power house of Three Gorges Project[J].Rock and Soil Mechanics,2002,(6):82-84,88.
[7]巨能攀,黄润秋,许模,等.某水电站地下洞室随机块体稳定性评价及系统锚固设计[J].工程地质学报,2004,2:97-103.JU Neng-pan,HUANG Run-qiu,XU Mo,et al.Stability evaluation of random blocks and design of systematic anchoring for the underground caverns in a hydropower station[J].Journal of Engineering Geology,2004,2:97-103.
[8]NEWMARK N M.Effects of earthquakes on dams and embankments[J].Geotechnique,1965,15(2):139-160.
[9]SEED H B.Consideration in the earthquake design of earth and rockfill dams[J].Geotechnique,1979,29(3):215-263.
[10]MAKDISI F I,SEED H B.Simplified procedure for estimating dam and embankment earthquake induced deformations[J].Journal of Geotechnical Engineering,ASCE1978,104(GT7):849-867.
[11]刘汉东.考虑地震历时影响的岩质边坡楔体稳定性分析与计算[J].华北水利水电学院学报,1991,4:35-40.LIU Han-dong.Analysis and computation of sliding wedge in rockmass considered influence of earthquake historical time[J].Journal of North China Institute of Water Conservancy and Hydroelectric Power,1991,(4):35-40.
[12]王思敬,薛守义.岩体边坡楔形体动力学分析[J].地质科学,1992,(2):177-182.WANG Si-jing,XUE Shou-yi.Dynamic analysis of wedge sliding on rock slopes[J].Scientia Geologica Sinica,1992,(2):177-182.
[13]薛守义,王思敬,刘建中.块状岩体边坡地震滑动位移分析[J].工程地质学报,1997,5(2):131-136.XUE Shou-yi,WANG Si-jing,LIU Jian-zhong.Analysis of sliding displacements of rockmass on slopes earthquske[J].Journal of Engineering Geology,1997,5(2):131-136.
[14]PAUL B,THOMAS T,PETER M,et al.Structural and hydrogeological characterization of the excavation disturbed zone in the Opalinus Clay(Mont Terri Project,Switzerland)[J].Applied Clay Science,2004,1-20
[15]SHENG Q,YUE Z Q,LEE C F,et al.Estimating the excavation disturbed zone in the slopes of the Three Gorges Project China[J].Int.J.Rock Mech.Min.Sci.,2002,39:165-184.
[16]肖明,龚玉锋,俞裕泰.西龙池抽水蓄能电站地下厂房围岩稳定三维非线性分析[J].岩石力学与工程学报,2000,19(5):557-561.XIAO Ming,GONG Yu-feng,YU Yu-tai.Three dimensional stability analysis on surrouding rock of underground house of Xilongchi pumped storage hydro-power station[J].Chinese Journal of Rock Mechanics and Engineering,2000,19(5):557-561.
[17]祁生文.考虑结构面退化的岩质边坡地震永久位移研究[J].岩土工程学报,2007,(3):452-457.QI Sheng-wen.Evaluation of the permanent displacement of rock mass slope considering deterioration of slide surface during earthquake[J].Chinese Journal of Geotechnical Engineering,2007,(3):452-457.
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