坡形和加筋措施对地震响应影响的振动台模型实验研究
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摘要
实施边坡工程地震性态控制设计方法的关键是揭示边坡土性、坡形对基岩地震动参数传递影响的规律。利用大型振动台分别进行了层状土与边坡模型的振动台对比实验、素土与铺设加筋材料的振动台对比实验。实验发现,与层状土对比,具有临空面的边坡对地震加速度峰值放大系数可增加约30%;素土与铺设加筋材料的层状土实验相比,后者对加速度峰值放大系数则可减小约20%;此外,还对地震作用下模型的动力特性进行了探讨,发现同一模型在重复实验后,土体损伤导致模型自振频率降低,此时土体对地震波表现出更强的放大效应。
Revealing the influence of soil properties and slope shape on ground motion parameters of rock is the key to earthquake control design of slope engineering.The contrast test between slope model and layered soil model experiments through shaking table,as well as the contrast test between reinforced layered soil model and layered soil model are carried out.It is found that compared with layered soil,the amplitude magnification coefficient of seismic acceleration will increase by almost 30% in slope with free face;compared with layered soil,the amplitude magnification coefficient of seismic acceleration in reinforced layered soil can be reduced by 20%.In addition,the dynamic properties of the models under seismic force are discussed.It is found that the self-vibrating frequency of one model will decrease after repetitive vibration,and at the same time,the seismic acceleration of the soil shows a larger amplification.
Revealing the influence of soil properties and slope shape on ground motion parameters of rock is the key to earthquake control design of slope engineering.The contrast test between slope model and layered soil model experiments through shaking table,as well as the contrast test between reinforced layered soil model and layered soil model are carried out.It is found that compared with layered soil,the amplitude magnification coefficient of seismic acceleration will increase by almost 30% in slope with free face;compared with layered soil,the amplitude magnification coefficient of seismic acceleration in reinforced layered soil can be reduced by 20%.In addition,the dynamic properties of the models under seismic force are discussed.It is found that the self-vibrating frequency of one model will decrease after repetitive vibration,and at the same time,the seismic acceleration of the soil shows a larger amplification.
引文
[1]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.
[2]刘洪兵,朱②.地震中地形放大效应的观测和研究进展[J].世界地震工程,1999,15(3):21-25.
[3]汤书明.土石坝抗震模型试验述评[J].河海科技进展,1992,12(1):47-55.
[4]刘小生,王钟宁,汪小刚,等.面板坝大型振动台模型试验与动力分析[M].北京:中国水利水电出版社,2005.
[5]Aso T.A dynamic model test and analysis of a steel pipepiled well foundation[C]//Proc:11WCEE,1996:1085.
[6]Hideto S.Study on nonlinear dynamic analysis method ofpile subjected to ground motion,part 2:comparison be-tween theory and experiment[C]//Proc:11WCCE,1996:1289.
[7]Don H,Peter M B.Dynamic response of single piles andsoil-pile interaction[J].Canada Geotech.J.1996,33:80-96.
[8]GB 50111—2006,铁路工程抗震设计规范[S].
[9]周汉荣.塑性网格加筋土力学性能的试验研究及其在工程中的应用[J].中南公路工程,1986,1(1):26-32.
[10]李刚,段林,熊益农,等.SH波激励下上覆粘弹性场地土的震动分析[J].中南公路工程,2007,32(2):91-94.
[2]刘洪兵,朱②.地震中地形放大效应的观测和研究进展[J].世界地震工程,1999,15(3):21-25.
[3]汤书明.土石坝抗震模型试验述评[J].河海科技进展,1992,12(1):47-55.
[4]刘小生,王钟宁,汪小刚,等.面板坝大型振动台模型试验与动力分析[M].北京:中国水利水电出版社,2005.
[5]Aso T.A dynamic model test and analysis of a steel pipepiled well foundation[C]//Proc:11WCEE,1996:1085.
[6]Hideto S.Study on nonlinear dynamic analysis method ofpile subjected to ground motion,part 2:comparison be-tween theory and experiment[C]//Proc:11WCCE,1996:1289.
[7]Don H,Peter M B.Dynamic response of single piles andsoil-pile interaction[J].Canada Geotech.J.1996,33:80-96.
[8]GB 50111—2006,铁路工程抗震设计规范[S].
[9]周汉荣.塑性网格加筋土力学性能的试验研究及其在工程中的应用[J].中南公路工程,1986,1(1):26-32.
[10]李刚,段林,熊益农,等.SH波激励下上覆粘弹性场地土的震动分析[J].中南公路工程,2007,32(2):91-94.
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