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Dynamic responses of bridge-approach embankment transition section of high-speed rail

ISSN号：2095-2899
期刊名称：Journal of Central South University
时间：2013.10
页码：2830-2839
分类：P315.9[天文地球—地震学;天文地球—固体地球物理学;天文地球—地球物理学] TU311.3[建筑科学—结构工程]
作者机构：[1]The Institute of Geological ＆ Nuclear Science, Lower Hutt 5040, New Zealand, [2]School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
相关基金：This research was supported by the National Natural Science Foundation of China （No. 41030742） and Technology Research of Railway Ministry （No. 2009G010-C）
相关项目：川藏交通干线环境灾害演化规律与工程风险

关键词：地震反应, 液化气, 网站, 立地条件, 地面位移, 峰值加速度, 有效应力分析, 衰减模型, seismic responses, liquefied and non-liquefied, excessive pore-water pressure

中文摘要：

为了在液化地点，一个可溶解的地点和一个非可溶解的地点理解地震反应的特征，被选择，由大约 500 m 分开了并且在国家地震作为班 D 有一样的地点条件冒险减小节目(NEHRP ) 。岩石地点上的地震记录的一间套房为大小被选择并且可伸缩到 Joyner， Boore，和 Fumal (JBF ) 变细模型的光谱在 50 km 的距离的 7.5 地震。放大记录然后被用来使二个地点激动。毛孔水压力的效果用有效压力分析方法被调查，并且非线性的土壤行为被围住表面模型的土壤建模。为系列，山峰地面加速(针网阵列) ，山峰地面排水量(PGD ) 和永久排水量的比较被执行。结果证明在非液化的地点的吝啬的地面反应光谱从 JBF 模型接近估计的地面反应光谱，但是平均数在液化地点扎根反应光谱是比从为多达 1.3 s 的时期的 JBF 模型的估计的地面反应光谱低得多的。在非液化的地点的吝啬的针网阵列在液化地点 1.61.7 倍大于那在附近，但是在非液化的地点的吝啬的山峰地面排水量(PGD ) 在液化地点与那有细微差别。在液化地点的吝啬的永久排水量比在非液化的地点的那些大，特别地在液化的层。

英文摘要：

To understand the characteristics of seismic response at liquefied sites, a liquefiable site and a non-liquefiable site were selected, separated by about 500 m and having the same site conditions as Class D in the National Earthquake Hazards Reduction Program （NEHRP）. A suite of earthquake records on rock sites are selected and scaled to the spectrum of the Joyner, Boore, and Fumal （JBF） attenuation model for a magnitude 7.5 earthquake at a distance of 50 km. The scaled records were then used to excite the two sites. The effect of pore-water pressure was investigated using the effective stress analysis method, and nonlinear soil behavior was modeled by a soil bounding surface model. Comparisons for spectra, peak ground acceleration （PGA）, peak ground displacement （PGD） and permanent displacement were performed. Results show that the mean ground response spectrum at the non-liquefied site is close to the estimated ground response spectrum from the JBF model, but the mean ground response spectrum at the liquefied site is much lower than the estimated ground response spectrum from the JBF model for periods of up to 1.3 s. The mean PGA at the non-liquefied site is about 1.6-1.7 times as large as that at the liquefied site, but the mean peak ground displacement （PGD） at the non-liquefied site has a slight difference with that at the liquefied site. The mean permanent displacements at the liquefied site are larger than those at the non-liquefied site, particularly at the liquefied layer.

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