我国西南山区输电线路场地地震效应
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摘要
西南山区大部分为具覆盖层下伏基岩场地,并且地势陡峻。在其输电线路工程中,场地在地震作用下的稳定性对上部杆塔结构的安全影响较为明显。目前对于不同场地条件对地震动的影响有一定的研究,但针对西南山区陡坡地形,特别是具基岩场地中基岩强度对场地地震效应的研究还较少。以西南山区某典型输电线路场地为研究对象,采用FLAC3D数值分析软件,运用时程分析方法,分析场地地震峰值加速度放大系数、场地永久位移随覆盖层厚度和基岩强度的变化特征,探讨西南山区不同场地地基条件的地震效应。研究表明:随着覆盖层厚度的增加,场地峰值加速度放大系数逐渐减小、永久位移逐渐增大;随着基岩强度的增大,场地水平峰值加速度放大系数逐渐减小,竖向峰值加速度放大系数逐渐增大、永久位移逐渐减小。
M ost of southw est mountainous areas are underlying bedrock ground cover layer,and the terrain is steep. In the transmission line engineering,the influence of the site stability under seismic action on the safety of upper tow er structure is obvious. At present,there are some researches on the influence of different site conditions on seismic effect,but there are few researches for the southw est steep terrain,especially for the influence of the bedrock strength in the rock sites on the seismic effect of the site. Taking a typical transmission line site in southw estern mountainous area as research object,w ith using numerical analysis softw are FLAC3 D and time history analysis method, this paper analyzed the seismic peak acceleration amplification coefficient on site,the variation characteristics of the permanent displacement on site along w ith the cover thickness and bedrock strength, and discussed the seismic effect of different site conditions in southw est mountainous area. The results show that: w ith the increase of cover thickness,the peak acceleration amplification coefficient gradually decreases,and the permanent displacement gradually increases; w ith the increase of bedrock strength,the vertical peak acceleration amplification coefficient gradually increases,and the horizontal peak acceleration amplification coefficient and the permanent displacement gradually decrease.
M ost of southw est mountainous areas are underlying bedrock ground cover layer,and the terrain is steep. In the transmission line engineering,the influence of the site stability under seismic action on the safety of upper tow er structure is obvious. At present,there are some researches on the influence of different site conditions on seismic effect,but there are few researches for the southw est steep terrain,especially for the influence of the bedrock strength in the rock sites on the seismic effect of the site. Taking a typical transmission line site in southw estern mountainous area as research object,w ith using numerical analysis softw are FLAC3 D and time history analysis method, this paper analyzed the seismic peak acceleration amplification coefficient on site,the variation characteristics of the permanent displacement on site along w ith the cover thickness and bedrock strength, and discussed the seismic effect of different site conditions in southw est mountainous area. The results show that: w ith the increase of cover thickness,the peak acceleration amplification coefficient gradually decreases,and the permanent displacement gradually increases; w ith the increase of bedrock strength,the vertical peak acceleration amplification coefficient gradually increases,and the horizontal peak acceleration amplification coefficient and the permanent displacement gradually decrease.
引文
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[2]薄景山,李秀领,李山有.场地条件对地震动影响研究的若干进展[J].世界地震工程,2003,19(2):11-15.Bo Jingshan,Li Xiuling,Li Shanyou.Some progress of study on the effect of site conditions on ground motion[J].World Earthquake Engineering,2003,19(2):11-15.
[3]吕悦军,彭艳菊,兰景岩,等.场地条件对地震动参数影响的关键问题[J].震灾防御技术,2008,3(2):126-135.Lv Yuejun,Peng Yanju,Lan Jingyan,et al.Some key problems about site effects on seismic ground motion parameters[J].Technology for Earthquake Disaster Prevention,2008,3(2):126-135.
[4]袁丽侠.场地土对地震波的放大效应[J].世界地震工程,2003,19(1):113-120.Yuan Lixia.The amplifying effect of ground soil to earthquake w ave[J].World Earthquake Engineering,2003,19(1):113-120.
[5]陈党民,段蕊.场地条件对地表峰值加速度的放大效应分析[J].地震工程与工程振动,2013(1):006.Chen Dangmin,Duan Rui.Amplification effects of site conditions on ground peak accelerations[J].Earthquake Engineering and Engineering Vibration,2013(1):006.
[6]文雯,宋廷苏,王珏.单一均质土覆盖层厚度对地表峰值加速度和反应谱平台值的影响[J].地震研究,2013,35(4):548-554.Wen Wen,Song Tingsu,Wang Yu.Effects of the thickness of overburden layer w ith signal homogeneous soil on peak acceleration of ground motions and platform value of the acceleration response spectrum[J].Journal of Seismological Research,2013,35(4):548-554.
[7]薄景山,李秀领,刘红帅.土层结构对地表加速度峰值的影响[J].地震工程与工程振动,2003,23(3):35-40.Bo Jingshan,Li Xiuling,Liu Hongshuai.Effect of soil layer construction on peak accelerations of ground motions[J].Earthquake Engineering and Engineering Vibration,2003,23(3):35-40.
[8]刘红帅,薄景山,吴兆营,等.土体参数对地表加速度峰值和反应谱的影响[J].地震研究,2005,28(2):167-171.Liu Hongshuai,Bo Jingshan,Wu Zhaoying.Effects of soil parameters on ground surface acceleration peak and response spectra[J].Journal of Seismological Research,2005,28(2):167-171.
[9]高峰,陈兴冲,严松宏.季节性冻土和多年冻土对场地地震反应的影响[J].岩石力学与工程学报,2006,25(8):1.Gao Feng,Chen Xingchong,Yan Songhong.Influence of permafrost and seasonally frozen soil on seismic responses of sites[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(8):1.
[10]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.
[11]刘书伟,林杭,任连伟.FLAC3D在岩土工程中的应用[M].北京:中国水利水电出版社,2011.
[12]Wang L,Wu X,Zhang X.Influence study of site conditions on buried pipeline's seismic performance[C]//Reston,VA:ASCE copyright Proceedings of the International Conference on Pipelines and Trenchless Technology,2011,Beijing,China,2011.
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