不同场地考虑衬垫层影响的填埋场地震响应
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摘要
采用薄层土体代替衬垫层,并提出薄层土体相应的动力计算参数,建立填埋场动力计算模型,采用一维多层土体的等效线性解法进行求解,研究了衬垫界面、填埋高度和场地条件对填埋场地震响应的影响规律.计算结果表明:在中震或强震作用下填埋场衬垫处发生较大的剪切位移,限制了地震波的向上传播,忽略衬垫层对填埋场地震响应的影响会造成较大的误差;当填埋场高度为15m时,填埋场顶部峰值加速度最大,随着填埋高度的增加,填埋场基本周期逐渐增大,远离了共振状态,使得填埋场顶部加速度逐渐减小;通过对比4种场地条件下填埋场的地震响应变化规律可发现场地条件的变化对填埋场的地震响应也有较大影响.
A new calculated model was developed to analyze the seismic responses of MSW landfills.In this model,a geosynthetic liner is replaced by an equivalent soil layer which is characterized by duplicating the liner interface response under dynamic loads.Then,the effects of liner interface,landfill height and site condition on seismic responses of landfills were studied.The calculated results show that the shear displacement is very large at the liner interface under medium or strong seismic motion,which limits the propagation of seismic waves.If the effect of the liner interface on the seismic response of the landfill is not taken into account,some errors might occur.It can be seen that the landfill with 15 m height shows the maximum value of maximum horizontal acceleration(MHA) at the top of the landfill.With the increase of the landfill height,the fundamental period of vibration of the landfill is gradually increasing by deviating from the resonance range.Thus,the MHA values at the top of the landfills are lower for higher landfills.Additionally,compared with the calculated results under four different site conditions,it can thus be concluded that different site types have strong effects on seismic responses of landfills.
A new calculated model was developed to analyze the seismic responses of MSW landfills.In this model,a geosynthetic liner is replaced by an equivalent soil layer which is characterized by duplicating the liner interface response under dynamic loads.Then,the effects of liner interface,landfill height and site condition on seismic responses of landfills were studied.The calculated results show that the shear displacement is very large at the liner interface under medium or strong seismic motion,which limits the propagation of seismic waves.If the effect of the liner interface on the seismic response of the landfill is not taken into account,some errors might occur.It can be seen that the landfill with 15 m height shows the maximum value of maximum horizontal acceleration(MHA) at the top of the landfill.With the increase of the landfill height,the fundamental period of vibration of the landfill is gradually increasing by deviating from the resonance range.Thus,the MHA values at the top of the landfills are lower for higher landfills.Additionally,compared with the calculated results under four different site conditions,it can thus be concluded that different site types have strong effects on seismic responses of landfills.
引文
[1]冯世进.城市固体废弃物静动力强度特性及填埋场的稳定性分析[D].杭州:浙江大学,2005.FENG Shijin.Static and dynamic strength properties ofmunicipal solid waste and stability analysis of landfill[D].Hangzhou:Zhejiang University,2005.
[2]Choudhury D,Savoikar P.Equivalent-linear seismic analysis ofMSW landfills using DEEPSOIL[J].Engineering Geology,2009,107:98.
[3]Augello A J,Bray J D,Abrahamson N A,et al.Dynamicproperties of solid waste based on back-analysis of OII landfill[J].Journal of Geotechnical and GeoenvironmentalEngineering,1998,124(3):211.
[4]Bray J D,Rathje E M.Earthquake induced displacement ofsolid waste landfills[J].Journal of Geotechnical andGeoenvironmental Engineering,1998,124(3):242.
[5]邓学晶,孔宪京,刘君.城市垃圾填埋场的地震响应及稳定性分析[J].岩土力学,2007,28(10):2095.DENG Xuejing,KONG Xianjing,LIU Jun.Seismic response andstability analysis of municipal waste landfills[J].Rock and SoilMechanics,2007,28(10):2095.
[6]Psarropoulous P N,Tsompanakis Y,Karabatsos Y.Effects oflocal site conditions on the seismic response of municipal solidwaste landfills[J].Soil Dynamics and EarthquakeEngineering,2007,27:553.
[7]Yegian M K,Harb J N,Kadakal U.Dynamic response analysisprocedure for landfills with geosynthetic liners[J].Journal ofGeotechnical and Geoenvironmental Engineering ASCE.1998,124(10):1027.
[8]杨德志.垃圾填埋场的地震响应分析[M].上海:同济大学,2011.YANG Dezhi.Seismic response evaluation of municipal wastelandfills[M].Shanghai:Tongji University,2011.
[9]冯世进,陈云敏,孔宪京,等.城市固体废弃物动力特性试验研究[J].岩土工程学报,2005,27(7):750.FENG Shijin,CHEN Yunmin,KONG Xianjing,et al.Experimental research on dynamic properties of municipal solidwaste[J].Chinese Journal of Geotechnical Engineering,2005,27(7):750.
[10]Seed H B,Idriss I M.Soil modulii and damping factors for thedynamic response analysis[R].Berkeley:EarthquakeEngineering Research Center of University of California,Berkeley,1970.
[11]Vucetic M,Dobry R.Effect of soil plasticity on cyclic response[J].Journal of Geotechnical Engineering,ASCE.1991,117(1):89.
[2]Choudhury D,Savoikar P.Equivalent-linear seismic analysis ofMSW landfills using DEEPSOIL[J].Engineering Geology,2009,107:98.
[3]Augello A J,Bray J D,Abrahamson N A,et al.Dynamicproperties of solid waste based on back-analysis of OII landfill[J].Journal of Geotechnical and GeoenvironmentalEngineering,1998,124(3):211.
[4]Bray J D,Rathje E M.Earthquake induced displacement ofsolid waste landfills[J].Journal of Geotechnical andGeoenvironmental Engineering,1998,124(3):242.
[5]邓学晶,孔宪京,刘君.城市垃圾填埋场的地震响应及稳定性分析[J].岩土力学,2007,28(10):2095.DENG Xuejing,KONG Xianjing,LIU Jun.Seismic response andstability analysis of municipal waste landfills[J].Rock and SoilMechanics,2007,28(10):2095.
[6]Psarropoulous P N,Tsompanakis Y,Karabatsos Y.Effects oflocal site conditions on the seismic response of municipal solidwaste landfills[J].Soil Dynamics and EarthquakeEngineering,2007,27:553.
[7]Yegian M K,Harb J N,Kadakal U.Dynamic response analysisprocedure for landfills with geosynthetic liners[J].Journal ofGeotechnical and Geoenvironmental Engineering ASCE.1998,124(10):1027.
[8]杨德志.垃圾填埋场的地震响应分析[M].上海:同济大学,2011.YANG Dezhi.Seismic response evaluation of municipal wastelandfills[M].Shanghai:Tongji University,2011.
[9]冯世进,陈云敏,孔宪京,等.城市固体废弃物动力特性试验研究[J].岩土工程学报,2005,27(7):750.FENG Shijin,CHEN Yunmin,KONG Xianjing,et al.Experimental research on dynamic properties of municipal solidwaste[J].Chinese Journal of Geotechnical Engineering,2005,27(7):750.
[10]Seed H B,Idriss I M.Soil modulii and damping factors for thedynamic response analysis[R].Berkeley:EarthquakeEngineering Research Center of University of California,Berkeley,1970.
[11]Vucetic M,Dobry R.Effect of soil plasticity on cyclic response[J].Journal of Geotechnical Engineering,ASCE.1991,117(1):89.
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