冻融循环作用下边坡地震动稳定性研究
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摘要
季节冻土区和多年冻土区边坡在经历冻融循环后其力学性质产生较大变化,边坡稳定性随之改变,在地震动荷载作用下存在着巨大的安全隐患。本文基于FLAC数值软件,将考虑冻土相变的显热熔算法引入热学计算模块,并结合静态边界动力计算模块,建立了适用于冻融循环条件下的边坡地震动稳定性分析平台。研究了冻融循环对边坡土体地震动稳定性的影响。结果表明,在发生冻融循环的季节冻土区或多年冻土已经退化的区域,地震动后边坡的塑性破坏形式主要取决于发生冻融循环的活动层的范围。
In seasonal and permanent permafrost region,the soil mechanical properties may be changed considerably in construction work,which is potentially threat to the stability of infrastructure during earthquakes.This paper develops an analysis platform for the slope earthquake stability considering freeze-thaw cycling based on FLAC.The platform embedded an explicit specific heat algorithm to reflect the ice-water phase change effect.The effects of freeze-thaw cycling on slope earthquake stability are analyzed.The results indicate that the range of active layer is a main factor influencing the plastic destroying form.
In seasonal and permanent permafrost region,the soil mechanical properties may be changed considerably in construction work,which is potentially threat to the stability of infrastructure during earthquakes.This paper develops an analysis platform for the slope earthquake stability considering freeze-thaw cycling based on FLAC.The platform embedded an explicit specific heat algorithm to reflect the ice-water phase change effect.The effects of freeze-thaw cycling on slope earthquake stability are analyzed.The results indicate that the range of active layer is a main factor influencing the plastic destroying form.
引文
安维东,1989.冻土的温度水分应力及其相互作用.兰州:兰州大学出版社.
胡聿贤,2007.地震安全性评价技术教程.北京:地震出版社.
李晶岩,付丽,2011.边坡稳定性分析方法.山西建筑,37(4):65—66.
孟庆生,2011.边坡稳定性影响因素分析.科技风,(3):154—155.
齐吉琳,张建明,朱元林,2003.冻融循环对土结构性的影响及其土力学意义.岩石力学与工程学报,22(增2):2690—2694.
王兰民,孙军杰,2007.特殊土动力学的发展战略与展望.西北地震学报,29(1):92.
徐学祖,王家澄,张立新,2001.冻土物理学.北京:科学出版社.
赵涛,折学森,2012.基于地震力的边坡优化设计.广西大学学报,37(4):707.
Aoyama K.S.,Ogawa and M.Fukuda,1985.Temperature dependencies of mechanical properties of soils subjected to freezing and thawing.See:Proceedings of the4th International Symposium on Ground Freezing Sapporo,Japan(S.Kinosita and M.Fukuda,Ed.),Rotterdam,Netherlands:A.A.Balkema Publishers:217—222.
Biggs J.M.,1964.Introduction to Structural Dynamics.New York:McGraw-Hill.
Chuvilin,Ye M.and Yazynin O.M.,1988.Frozen soil macro-and microstructure formation.See:5th Int.Conf.on Permafrost,Trondheim:320—323.
Cheng G.D.,2003.The impact of local factors on permafrost distribution and its inspiring for design Qinghai-Xizang railway.Science in China(Series D),33(6):602—607.
Eigenbrod K.D.,1996.Effects of cyclic freezing and thawing on volume changes and permeabilities of soft fine-grained soils.Canadian Geotechnical Journal,33(4):529—537.
Itasca,1999.Flac manual:theoretical background.Itasca Consulting Group,Minneapolis.
Leroueil S.,Tardif J.,Roy M.et al.,1991.Effects of frost on the mechanical behaviour of Champlain Sea clays.Canadian Geotechnical Journal,28(5):690—697.
Ogata N.,Kataoka T.and Komiya A.,1985.Effect of freezing-thawing on the mechanical properties of soil.See:Proc.Proc.4th Int.Symp.Ground Freezing,Sapporo,Japan:201—207.
Ono T.and Mitachi T.,1997.Computer controlled triaxial freeze-thaw-shear apparatus.See:Proc.8th Int.Symp.Ground Freezing.A.A.Balkema,Rotterdam,Netherlands:335—339.
Swan,1998.Christopher and Greene,Christopher,Freeze-thaw effects on Boston Blue clay.Journal of Engineering and Applied Science,Soil Improvement for Big Digs.81:161—176.
Yao Xiaoliang,Qi Jilin,Wu Wei,2012.Three dimensional analysis of large strain thaw consolidation in permafrost.Acta Geotechnica,7(3):193—202.
胡聿贤,2007.地震安全性评价技术教程.北京:地震出版社.
李晶岩,付丽,2011.边坡稳定性分析方法.山西建筑,37(4):65—66.
孟庆生,2011.边坡稳定性影响因素分析.科技风,(3):154—155.
齐吉琳,张建明,朱元林,2003.冻融循环对土结构性的影响及其土力学意义.岩石力学与工程学报,22(增2):2690—2694.
王兰民,孙军杰,2007.特殊土动力学的发展战略与展望.西北地震学报,29(1):92.
徐学祖,王家澄,张立新,2001.冻土物理学.北京:科学出版社.
赵涛,折学森,2012.基于地震力的边坡优化设计.广西大学学报,37(4):707.
Aoyama K.S.,Ogawa and M.Fukuda,1985.Temperature dependencies of mechanical properties of soils subjected to freezing and thawing.See:Proceedings of the4th International Symposium on Ground Freezing Sapporo,Japan(S.Kinosita and M.Fukuda,Ed.),Rotterdam,Netherlands:A.A.Balkema Publishers:217—222.
Biggs J.M.,1964.Introduction to Structural Dynamics.New York:McGraw-Hill.
Chuvilin,Ye M.and Yazynin O.M.,1988.Frozen soil macro-and microstructure formation.See:5th Int.Conf.on Permafrost,Trondheim:320—323.
Cheng G.D.,2003.The impact of local factors on permafrost distribution and its inspiring for design Qinghai-Xizang railway.Science in China(Series D),33(6):602—607.
Eigenbrod K.D.,1996.Effects of cyclic freezing and thawing on volume changes and permeabilities of soft fine-grained soils.Canadian Geotechnical Journal,33(4):529—537.
Itasca,1999.Flac manual:theoretical background.Itasca Consulting Group,Minneapolis.
Leroueil S.,Tardif J.,Roy M.et al.,1991.Effects of frost on the mechanical behaviour of Champlain Sea clays.Canadian Geotechnical Journal,28(5):690—697.
Ogata N.,Kataoka T.and Komiya A.,1985.Effect of freezing-thawing on the mechanical properties of soil.See:Proc.Proc.4th Int.Symp.Ground Freezing,Sapporo,Japan:201—207.
Ono T.and Mitachi T.,1997.Computer controlled triaxial freeze-thaw-shear apparatus.See:Proc.8th Int.Symp.Ground Freezing.A.A.Balkema,Rotterdam,Netherlands:335—339.
Swan,1998.Christopher and Greene,Christopher,Freeze-thaw effects on Boston Blue clay.Journal of Engineering and Applied Science,Soil Improvement for Big Digs.81:161—176.
Yao Xiaoliang,Qi Jilin,Wu Wei,2012.Three dimensional analysis of large strain thaw consolidation in permafrost.Acta Geotechnica,7(3):193—202.
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