地震作用下滑坡永久位移预测
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摘要
在地震区滑坡防治结构的抗震设计中,滑坡体自身的稳定安全性可利用其地震作用下产生的永久位移直接判断,可见对其地震永久变形的预测至关重要。因此,以极限分析上限定理为基础,分别针对平移式和旋转式两种滑坡滑移形式,推导出这两种滑移形式下滑坡体产生永久位移的临界加速度,考虑地震输入能量及结构能量耗散之间的平衡关系并建立预测地震作用下滑坡永久位移的计算方法。最后,通过算例表明其合理性。
Seismic permanent displacement forecast is quite important in seismic design of landslide prevention and control structure in earthquake zone.The stability of landslide mass itself can be directly judged from this permanent displacement.Therefore,the critical accelerations that cause permanent displacement of landslide mass for two types of slide,i.e.,translation and revolution were deduced based on upper bound theorem of limit analysis.Considering the balance relationship between seismic input energy and structural energy dissipation,the calculation method that predict landslide permanent displacement under earthquake action was established.Finally,an example was given to prove the reasonability of the method.
Seismic permanent displacement forecast is quite important in seismic design of landslide prevention and control structure in earthquake zone.The stability of landslide mass itself can be directly judged from this permanent displacement.Therefore,the critical accelerations that cause permanent displacement of landslide mass for two types of slide,i.e.,translation and revolution were deduced based on upper bound theorem of limit analysis.Considering the balance relationship between seismic input energy and structural energy dissipation,the calculation method that predict landslide permanent displacement under earthquake action was established.Finally,an example was given to prove the reasonability of the method.
引文
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[11]董璞.地震动特性及引起的结构破坏机理浅析[J].惠州学院学报:自然科学版,2002,22(3):94-96.DONG Pu.Characteristics of earthquake and the mechanism of its demolition on building structure[J].Journal of Huizhou University:Nat.Sci.,2002,22(3):94-96.(in Chinese)
[2]唐明辉.工程地质学基础[M].北京:化学工业出版社,2008:60-61.TANG Minghui.Foundations of Eegineering Geology[M].Beijing:Chemical Industry Press,2008:60-61.
[3]Abdoun T,Dobry R,O'rourke T D,et al.Pile response to lateral spreads:centrifuge modeling[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,129(10):869-878.
[4]罗渝,何思明,欧阳朝军,等.地震作用下组合结构加固边坡稳定性分析[J].四川大学学报:工程科学版,2010,42(S1):93-99.LUO Yu,HE Siming,OUYANG Chaojun,et al.Stability analysis of pile and anchor composite structure reinforced slope under the earthquake loading[J].Joural of Sichuan University:Engineering Science Edition,2010,42(S1):93-99.(in Chinese)
[5]吴永,何思明,李新坡.地震波作用下抗滑桩的失效机理[J].四川大学学报:工程科学版,2009,41(3):284-288.WU Yong,HE Siming,LI Xinpo.Failure mechanism of anti-slide pile under seismic wave[J].Journal of Sichuan University:Engineering Science Edition,2009,41(3):284-288.(in Chinese)
[6]梁庆国,韩文峰,马润勇,等.强地震动作用下层状岩体破坏的物理模拟研究[J].岩土力学,2005,26(8):1307-1311.LIANG Qingguo,HAN Wenfeng,MA Runyong,et al.Physical simulation study on dynamic failures of layered rock masses under strong ground motion[J].Rock and Soil Mechanics,2005,26(8):1307-1311.(in Chinese)
[7]Keefer D K.Landslides caused by earthquake[J].Bulletin of Geological Society of America,1984,95(4):406-421.
[8]熊斌.黏性泥石流运动机理[D].北京:清华大学,1996.XONG Bin.The Motion Mechanism of Viscous Debris[D].Beijing:Tsinghua University,1996.(in Chinese)
[9]Ambraseys N,Srbulov M.Earthquake induced displacements of slopes[J].Soil Dynamics and Earthquake Engineering,1995,14(1):59-71.
[10]Marzorati S,Luzi L,Amicis M De.Rock falls induced by earthquakes:a statistical approach[J].Soil Dynamics and Earthquake Engineering,2002,22(7):565-577.
[11]董璞.地震动特性及引起的结构破坏机理浅析[J].惠州学院学报:自然科学版,2002,22(3):94-96.DONG Pu.Characteristics of earthquake and the mechanism of its demolition on building structure[J].Journal of Huizhou University:Nat.Sci.,2002,22(3):94-96.(in Chinese)
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