地震波对边坡稳定性的影响及其分析方法
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摘要
介绍了目前地震作用下边坡稳定分析常用的拟静力法、时程法和边坡动力安全度法,通过对这3种方法计算结果的对比分析,表明边坡动力安全度法能更准确地判断边坡的动力稳定性;应用边坡动力安全度法分析了地震作用频率和振幅对边坡稳定性的影响,结果表明频率和振幅对边坡的稳定性有较大影响,动安全系数随着频率的增大而增大,其增幅逐渐减小;随着振幅的增大而降低,其降幅也逐渐减小。
The methods for seismic stability analysis of slope,such as pseudostatic analysis,time-history method and the dynamic safety degree evaluation method,were introduced.The results of comparison analysis of the three methods show that the dynamic safety degree evaluation method is more accurate.Then the influence of frequency and amplitude of seismic wave on dynamic safety of slope was analyzed.The results show that frequency and amplitude have more influence on stability of the slope,the dynamic safety factor increases with increase of frequency,but its increased amplitude reduces gradually;it decreases with increase of amplitude,and its decreased amplitude reduces too.
The methods for seismic stability analysis of slope,such as pseudostatic analysis,time-history method and the dynamic safety degree evaluation method,were introduced.The results of comparison analysis of the three methods show that the dynamic safety degree evaluation method is more accurate.Then the influence of frequency and amplitude of seismic wave on dynamic safety of slope was analyzed.The results show that frequency and amplitude have more influence on stability of the slope,the dynamic safety factor increases with increase of frequency,but its increased amplitude reduces gradually;it decreases with increase of amplitude,and its decreased amplitude reduces too.
引文
[1]刘汉龙,费康,高玉峰.边坡地震稳定性时程分析方法[J].岩土力学,2003,24(4):553～560.LIU Hanlong,FEI Kang,GAO Yufeng.Time history analysis method of slope seismic stability[J].Rock and Soil Mechanics,2003,24(4):553-560.
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[4]张宏洋.基于P-Z模型的高土石坝坝坡静动力稳定分析方法研究[D].南京:河海大学,2010.ZHANG Hongyang.Research on method of static-dynamic stability analysis for slope of high earth and rockfill dam basing on the P-Z model[D].NanJing:Hohai University,2010.
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[7]MARCUSON W F.III.Moderator’s report for session on earth dams and stability of slopes under dynamic loads[J].Proceedings International Con-ference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics,1981(2):1175-1178.
[8]Ling Hoe.I,Leshchinsky Dov,Mohri Yoshiyuki.Soil slopes under combined horizontal and vertical seismic acceleration[J].Earthquake Engi-neering and Structural Dynamics,1997.26(12):1231-1241.
[2]李育枢,高广运,李天斌.偏压隧道洞口边坡地震动力反应及稳定性分析[J].地下空间与工程学报,2006,2(5):738～743.LIU Yushu,GAO Guangyun,L I Tianbin.Analysis of Earthquake Response and Stabil ity Evaluation for Transverse Slope at Secund Tunnel Portal[J].Chinese Journal of Underground Space and Engineering,2006,2(5):738-743.
[3]马芳芳.基于地震动力时程反应的有限元边坡稳定性分析[D].大连:大连理工大学,2005.MA Fangfang.Study on the seismic stability of slope based on time history analysis method and finite element method[D].DaLian:Dalian Universi-ty of Technology,2005.
[4]张宏洋.基于P-Z模型的高土石坝坝坡静动力稳定分析方法研究[D].南京:河海大学,2010.ZHANG Hongyang.Research on method of static-dynamic stability analysis for slope of high earth and rockfill dam basing on the P-Z model[D].NanJing:Hohai University,2010.
[5]Terzaghi K.Mechanisms of landslide[M].Engineering Geology(Berdey)Volume,1950,Geological Society of America.
[6]Seed H B.Consideration in the earthquake-resistant design of earth and rock-fill dams[J].Geotechnique,1979,29(1):251-263.
[7]MARCUSON W F.III.Moderator’s report for session on earth dams and stability of slopes under dynamic loads[J].Proceedings International Con-ference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics,1981(2):1175-1178.
[8]Ling Hoe.I,Leshchinsky Dov,Mohri Yoshiyuki.Soil slopes under combined horizontal and vertical seismic acceleration[J].Earthquake Engi-neering and Structural Dynamics,1997.26(12):1231-1241.
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