地下水位上升对吹填场地地震响应的影响
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摘要
根据勘察资料和室内试验,构建了北部湾地区吹填场地的简化计算模型。采用完全非线性方法,针对可液化的吹填砂层采用Byrne模型进行动力流固耦合计算。通过输入不同幅值的El Centro波,研究地下水位上升对吹填场地地震响应规律的影响。结果表明:地下水位上升对吹填场地地表的水平向加速度具有放大作用,其中对多遇地震和少遇地震的放大作用相对于罕遇地震而言要显著;地下水位上升对砂土层超静孔隙水压力的积累和消散具有较大影响;地下水位上升对吹填场地地表沉降量的影响较小。
Based on the survey data and laboratory tests,a simplified calculation model for the blowing sand reclamation ground in Beibu Gulf area is established. By using a completely nonlinear method,the Byrne model is used to calculate the fluid-liquid coupling of liquefiable bed-fill sand.By inputting El Centro wave with different peak accelerations,the influence of groundwater level rising caused by sea level rise on site seismic response is simulated under the three exceeding probabilities. The results show that the rise of groundwater level can amplify the horizontal acceleration of the reclamation site surface. The amplification effect of frequently-occurred earthquakes and accidental earthquakes is significant compared with rarely-occurred earthquakes;the rise of groundwater level has a great influence on the accumulation and dissipation of the excess pore water pressure in sandy soil; the increase of groundwater level has little effect on the surfacesettlement of filling site.
Based on the survey data and laboratory tests,a simplified calculation model for the blowing sand reclamation ground in Beibu Gulf area is established. By using a completely nonlinear method,the Byrne model is used to calculate the fluid-liquid coupling of liquefiable bed-fill sand.By inputting El Centro wave with different peak accelerations,the influence of groundwater level rising caused by sea level rise on site seismic response is simulated under the three exceeding probabilities. The results show that the rise of groundwater level can amplify the horizontal acceleration of the reclamation site surface. The amplification effect of frequently-occurred earthquakes and accidental earthquakes is significant compared with rarely-occurred earthquakes;the rise of groundwater level has a great influence on the accumulation and dissipation of the excess pore water pressure in sandy soil; the increase of groundwater level has little effect on the surfacesettlement of filling site.
引文
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[3]刘快胜.地下水对震害影响的讨论[J].地震工程学报,1979(1):84-87.
[4]胡聿贤,孙平善,章在墉,等.场地条件对震害和地震动的影响[J].地震工程与工程振动,1980(1):36-43.
[5]GOEL R K.Earthquake Characteristics of Bridges with Integral Abutments[J].Journal of Structural Engineering,1997,123(11):1435-1443.
[6]李孝波,薄景山,李平,等.地震烈度异常研究的若干进展[J].地震学报,2013,35(3):430-440.
[7]孙吉主,高晖.液化条件对地表动力响应影响的有效应力动力分析[J].地震工程与工程振动,2005,25(2):150-154.
[8]高广运,陈青生,何俊锋,等.地下水位上升对上海软土场地地震反应的影响[J].岩土工程学报,2011,33(7):989-995.
[9]夏坤,董林,孙军杰.地下水位对黄土土层地震动影响初探[J].地震工程与工程振动,2012,32(6):45-52.
[10]宋波,黄帅,蔡德钩,等.地下水位变化对砂土边坡地震动力响应的影响研究[J].岩石力学与工程学报,2014,33(s1):2698-2706.
[11]黄帅,张力方,吕悦军,等.地下水位变化对砂质边坡地震稳定性的影响研究[J].防灾减灾工程学报,2015,35(5):599-606.
[12]常晁瑜,薄景山,张兆鹏,等.地下水对地震动参数的影响[J].地震工程学报,2016,38(3):366-372.
[13]宋亚平.吹沙型填海场地动力响应演化特征的模拟研究[D].南宁:广西大学,2015.
[14]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2013.
[15]MARTIN G R,FINN W D L,SEED H B.Fundamentals of liquefaction under cyclic loading[J].Journal of the Geotechnical Engineering Division,1975,101(5):423-438.
[16]BYRNE P M.A cyclic shear-volume coupling and pore-pressure model for sand[C]//Proceedings of Second International Conference on.Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics.St.Louis,Missouri:Geotechnical Special Publication,1991:47-55.
[17]中华人民共和国住房和城乡建设部.建筑工程抗震设防分类标准:GB50223-2008[S].北京:中国建筑工业出版社,2008.
[18]中华人民共和国住房和城乡建设部.建筑抗震设计规范:GB50011-2010[S].北京:中国建筑工业出版社,2010.
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