强震区桥台岸坡震动滑移破坏机理研究
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摘要
针对汶川地震中大量桥梁岸坡出现滑移破坏现象,对地震作用下桥台岸坡滑移进行了理论研究。根据米塞斯流动法则,得到地震作用下桥台岸坡滑动面应变速度以及与滑动线夹角,据此得出作用于岸坡各外力做功和塑性流动消耗的能量,依据外力所做功与内部消耗能量相等的原则,最终推导出岸坡最大地震主动土压力及所对应滑动面倾角,将能量耗散理论与岸坡滑移动力响应相结合,对地震下岸坡滑移现象进行安全评定。
Aiming at the phenomenon a large number of abutment slopes have sliding failure in Wenchuan Earthquake,a theoretic study of abutment slope sliding under seismic effect is carried out.According to Mises flow rule,the abutment slope sliding velocity as well as its angle between sliding lines under earthquake are obtained.In that case,the energy consumption of the work force acting on the slope and the plastic flow is obtained.And then,on the basis of principle that the work done by external forces is equivalent to internal energy consumption,the maximum slope seismic active earth pressure and the corresponding angle of sliding surface are finally got.Integrating the energy dissipation theory and the dynamic response to slope slide,the safety assessment of slope sliding under seismic effect is carried out.
Aiming at the phenomenon a large number of abutment slopes have sliding failure in Wenchuan Earthquake,a theoretic study of abutment slope sliding under seismic effect is carried out.According to Mises flow rule,the abutment slope sliding velocity as well as its angle between sliding lines under earthquake are obtained.In that case,the energy consumption of the work force acting on the slope and the plastic flow is obtained.And then,on the basis of principle that the work done by external forces is equivalent to internal energy consumption,the maximum slope seismic active earth pressure and the corresponding angle of sliding surface are finally got.Integrating the energy dissipation theory and the dynamic response to slope slide,the safety assessment of slope sliding under seismic effect is carried out.
引文
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[8]唐红梅,刘荣灿,陈洪凯.地震作用下桥台滑移计算方法及应用[J].公路,2010(3):42-47. TANG Hong-mei,LIU Rong-can,CHEN Hong-kai.Earthquakes slip under the bridge abutment Calculation and application[J]. Highway,2010(3):42 -47.
[9]Alemdar Bayraktar,Temel Turker,Mehmet Akkose,et al.The effect of reservoir length on seismic performance of gravity dams to near and far-fault ground motions[J].Natural Hazard' s,2010,52 (2):257-275.
[2]张鹏,陈新民,王旭东.近断层地震动与汶川地震灾区滑坡破坏特征分析[J].南京工业大学学报:自然科学版,2009,31(1):55-59. ZHANG Peng,CHEN Xin-min,WANG Xu-dong.Near-fault ground motion and earthquake damage characteristics of landslide disaster areas[J].Nanjing University of Technology:Natural Science, 2009,31(1):55 -59.
[3]曹鹏杰,顺远坤,雷涛.汶川地震中拱桥的震害调查及分析[J].科协论坛(下半月),2010(1):121-122. CAO Peng-jie,SHUN Yuan-kun,LEI Tao.Wenchuan earthquake damage investigation and analysis of bridge[J].Association Forum (Second Half),2010(1):121 -122.
[4]杜修力,韩强,李忠献,等.5.12汶川地震中山区公路桥梁震害及启示[J].北京工业大学学报,2008,34(12):1270-1279. DU Xiu-li,HAN Qiang,LI Zhong-xian,et al.5.12 Earthquake damage in the mountainous roads and bridges and enlightenment[J].Beijing University of Technology,2008,34(12):1270-1279.
[5]祁生文,伍法权,严福章,等.岩质边坡动力反应分析[M].北京:科学出版社,2007.
[6]许年春,石维力,石东虹.地震作用下边坡动力系数有限元分析[J].地下空间与工程学报,2008,4(6):1006-1010. XU Nian-chun,SHI Wei-li,SHI Dong-hong.Seismic finite element analysis of slope dynamic coefficient[J].Underground Space and Engineering,2008,4(6):1006 - 1010.
[7]李鸿晶,陆鸣,温增平,等.汶川地震桥梁震害的特征[J].南京工业大学学报:自然科学版,2009,31(1):24-29. LI Hong-jing,LU Ming,WEN Zeng-ping,et al.Characteristics of bridge damages earthquake[J].Nanjing University of Technology: Natural Science,2009,31(1):24 -29.
[8]唐红梅,刘荣灿,陈洪凯.地震作用下桥台滑移计算方法及应用[J].公路,2010(3):42-47. TANG Hong-mei,LIU Rong-can,CHEN Hong-kai.Earthquakes slip under the bridge abutment Calculation and application[J]. Highway,2010(3):42 -47.
[9]Alemdar Bayraktar,Temel Turker,Mehmet Akkose,et al.The effect of reservoir length on seismic performance of gravity dams to near and far-fault ground motions[J].Natural Hazard' s,2010,52 (2):257-275.
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