城市垃圾填埋场振动台试验的数值模拟研究
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摘要
对填埋场振动台模型试验进行非线性数值分析,并与试验结果相互补充、印证,进一步考察填埋场的地震响应规律。研究表明,特殊的夹层结构形式导致水平地震作用下城市垃圾填埋场存在两个主要的响应频率,在这两个主要频率附近模型顶部取得峰值加速度响应;不考虑其他因素的影响,填埋场防渗层的地震永久位移与输入地震动的水平位移振幅近似呈正比关系;坡比是影响填埋场覆盖层和衬垫层永久位移最主要的因素。
Based on the previous work of eight large scale physical model experiments of landfill conducted on shaking table,nonlinear numerical simulation for the test is performed subsequently;and the experimental and numerical results are verified and supplemented one another in order to further examine the characteristics of the seismic response of landfill.The follow results can be got:(1) Due to the special sandwich constructions,landfill has two main response frequencies;the peak acceleration responses at top of landfill are obtained in the vicinity of the two main frequencies under horizontal earthquake.(2) When other parameters are fixed,seism-induced permanent displacement of landfill liner is shown to be approximately proportional to the amplitude of input motion.(3) The inclination angle of landfill cover and base slope have significant effect on the critical sliding acceleration of cover and base liner system respectively.
Based on the previous work of eight large scale physical model experiments of landfill conducted on shaking table,nonlinear numerical simulation for the test is performed subsequently;and the experimental and numerical results are verified and supplemented one another in order to further examine the characteristics of the seismic response of landfill.The follow results can be got:(1) Due to the special sandwich constructions,landfill has two main response frequencies;the peak acceleration responses at top of landfill are obtained in the vicinity of the two main frequencies under horizontal earthquake.(2) When other parameters are fixed,seism-induced permanent displacement of landfill liner is shown to be approximately proportional to the amplitude of input motion.(3) The inclination angle of landfill cover and base slope have significant effect on the critical sliding acceleration of cover and base liner system respectively.
引文
[1]姜炳阳.含土工膜夹层土坡地震稳定性研究[D].大连:大连理工大学,2002.
[2]KRAMER S L,SMITH M W.Modified Newmark modelfor seismic slope displacements of compliant slopes[J].Journal of Geotechnical Engineering,1997,123(7):635-644.
[3]WARTMAN J,RAYMOND B,SEED M,et al.Shakingtable modeling of seismically induced deformations inslopes[J].Journal of Geotechnical and Geoenviro-nmental Engineering,ASCE,2005,131:610-622.
[4]陈云敏,高登,朱斌,等.垃圾填埋场沿衬垫层界面的地震稳定性及永久位移分析[J].中国科学,2008,38(1):79-94.CHEN Yun-min,GAO Deng,ZHU Bin,et al.Analysis ofstability and permanent displacement of landfill baseliner[J].Science in China,2008,38(1):79-94.
[5]邓学晶.城市垃圾填埋场振动台模型试验与地震稳定性分析方法研究[D].大连:大连理工大学,2007.
[6]孔宪京,邓学晶.城市垃圾填埋场地震变形机理的振动台试验研究[J].土木工程学报,2008,41(5):65-74.KONG Xian-jing,DENG Xue-jing.Shaking table test onseismically induced deformation mechanism of municipalwaste landfills[J].China Civil Eengineering Journal,2008,41(5):65-74.
[7]HOE I L.Recent applications of sliding block theory togeotechnical design[J].Soil Dynamics and EarthquakeEngineering,2001,21:189-197.
[8]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):2096-2100.DENG Xue-jing,KONG Xian-jing,LIU Jun.Seismicresponse and stability analysis of municipal wastelandfills[J].Rock and Soil Mechanics,2007,28(10):2096-2100.
[2]KRAMER S L,SMITH M W.Modified Newmark modelfor seismic slope displacements of compliant slopes[J].Journal of Geotechnical Engineering,1997,123(7):635-644.
[3]WARTMAN J,RAYMOND B,SEED M,et al.Shakingtable modeling of seismically induced deformations inslopes[J].Journal of Geotechnical and Geoenviro-nmental Engineering,ASCE,2005,131:610-622.
[4]陈云敏,高登,朱斌,等.垃圾填埋场沿衬垫层界面的地震稳定性及永久位移分析[J].中国科学,2008,38(1):79-94.CHEN Yun-min,GAO Deng,ZHU Bin,et al.Analysis ofstability and permanent displacement of landfill baseliner[J].Science in China,2008,38(1):79-94.
[5]邓学晶.城市垃圾填埋场振动台模型试验与地震稳定性分析方法研究[D].大连:大连理工大学,2007.
[6]孔宪京,邓学晶.城市垃圾填埋场地震变形机理的振动台试验研究[J].土木工程学报,2008,41(5):65-74.KONG Xian-jing,DENG Xue-jing.Shaking table test onseismically induced deformation mechanism of municipalwaste landfills[J].China Civil Eengineering Journal,2008,41(5):65-74.
[7]HOE I L.Recent applications of sliding block theory togeotechnical design[J].Soil Dynamics and EarthquakeEngineering,2001,21:189-197.
[8]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):2096-2100.DENG Xue-jing,KONG Xian-jing,LIU Jun.Seismicresponse and stability analysis of municipal wastelandfills[J].Rock and Soil Mechanics,2007,28(10):2096-2100.
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