上覆土层对可液化场地地震响应的影响研究
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摘要
为研究上覆土层厚度及土性对地震作用下的可液化场地响应的影响,构造若干类典型可液化场地剖面,将水平成层场地置于基岩上,选取Carbondale波并利用D-mod 2000进行场地非线性动力分析。经计算,随着上覆土层厚度的增加,地表峰值加速度减小;随着上覆土层塑性指数的增大,地表峰值加速度增大;可液化场地对输入地震波具有缩小效应。
In order to study how the thickness and soil property of overburden affect the response of liquefiable site under seismic action, the profiles of several typical liquefiable sites were constituted with horizontal layered site placed on bedrock, then Carbondale wave was selected and D-mod 2000 was used to conduct the nonlinear dynamic analysis on the sites. Through calculation, it is found that the peak acceleration of the earth surface decreases with the increase of overburden thickness and increases with the increase of overburden plasticity index; liquefiable site is of reduction effect on input seismic wave.
In order to study how the thickness and soil property of overburden affect the response of liquefiable site under seismic action, the profiles of several typical liquefiable sites were constituted with horizontal layered site placed on bedrock, then Carbondale wave was selected and D-mod 2000 was used to conduct the nonlinear dynamic analysis on the sites. Through calculation, it is found that the peak acceleration of the earth surface decreases with the increase of overburden thickness and increases with the increase of overburden plasticity index; liquefiable site is of reduction effect on input seismic wave.
引文
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[2] 王国波,杨林德.上海软土自由场地的三维地震响应分析[J].西北地震学报,2008,30(4):326-331.WANG G B,YANG L D.3D seismic response analysis of free-field soft soil in Shanghai[J].Northwestern Seismological Journal,2008,30(4):326-331.
[3] 梁孟根,梁甜,陈云敏.自由场地液化响应特性的离心机振动台试验[J].浙江大学学报(工学版),2013,47(10):1805-1814.LIANG M G,LIANG T,CHEN Y M.Centrifuge shaking table modeling of liquefaction characteristics of free field[J].Journal of Zhejiang University(Engineering Science),2013,47(10):1805-1814.
[4] 苏栋,高翔,明海燕,等.液化对砂土场地地表加速度响应的影响[J].防灾减灾工程学报,2016,36(1):69-74.SU D,GAO X,MING H Y,et al.Influence of Liquefaction on the responses of acceleration on the ground surface of sand layer[J].Journal of Disaster Prevention and Mitigation Engineering,2016,36(1):69-74.
[5] 杨繁,王敏,王国波,等.自由场地土体非线性地震响应研究[J].中国安全科学学报,2014,24(7):117-122.YANG F,WANG M,WANG G B,et al.Research on nonlinear seismic responses of free-field soil[J].China Safety Science Journal,2014,24(7):117-122.
[6] 梁建文,梁佳利,张季,等.深厚软土场地中三维凹陷地形非线性地震响应分析[J].岩土工程学报,2017,39(7):1196-1205.LIANG J W,LIANG J L,ZHANG J,et al.Nonlinear seismic response of 3D canyon in deep soft soils[J].Chinese Journal of Geotechnical Engineering,2017,39(7):1196-1205.
[7] 孙锐,赵倩玉,袁晓铭.液化与非液化场地加速度反应谱对比[J].岩土力学,2014,35(增刊1):299-305.SUN R,ZHAO Q Y,YUAN X M.Comparison between acceleration response spectra on liquefaction and non-liquefaction sites[J].Rock and Soil Mechanics,2014,35(S1):299-305.
[8] Markham C S,Bray J D,Macedo J,et al.Evaluating nonlinear effective stress site response analyses using records from the Canterbury earthquake sequence[J].Soil Dynamics and Earthquake Engineering,2016,82:84-98.
[9] Bouckovalas G D,Tsiapas Y Z,Zontanou V A,et al.Equivalent linear computation of response spectra for liquefiable sites:the spectral envelope method[J].Journal of Geotechnical and Geoenvironmental Engineering,2017,143(4):04016115.
[10] Matasovic N,Ordonez G.D-MOD 2000-A computer program package for seismic response analysis of horizontally layered soil deposits,earthfill dams,and solid waste landfills,User's Manual[K].Lacey,Washington:GeoMotions,2007.
[11] Vucetic M,Dobry R.Effect of soil plasticity on cyclic response[J].Journal of Geotechnical Engineering,1991,117(1):89-107.
[12] Konder R L,Zelasko J S.A hyperbolic stress-strain formulation for sands[C]//Proceedings of the 2nd Pan American Conference on Soil Mechanics and Foundation Engineering.Sao Paulo,Brazil:Northwestern University,1963:289-324.