摘要
采用一种改进的有效应力方法研究土层液化对地表加速度反应谱的影响,分析中考虑了砂层的厚度、埋深和输入地震波的幅值和波型等因素。分析结果表明,土层液化使地表加速度反应谱的特征周期至少延长0.1秒以上,使原Ⅱ类场地变为Ⅲ类场地,高烈度时易变成Ⅳ类场地,反应谱中周期0.8秒～1.0秒是液化砂层加震或减震的一个分界点,液化对反应谱短周期分量具有一定的减震作用,而对长周期分量有非常显著的放大作用。
Using an improved effective stress method, the effect of liquefied site on the response spectrum of surface acceleration are presented in the paper. The thickness and depth of the sand layer, the intensity and type of earthquake are considered in the analysis. The results here indicate that the typeⅡ of site is turned to the type Ⅲ or easily to type Ⅳ for high intersity area of the strong earthquake and that characteristic period of the site is prolonged at least 0.1s or more than 0.2s on average due to the sand liquefaction. The period of 0.8s～1.0s in the response spectrum is a critical limit, below which the liquefied soil layer decreases the acceleration components in the spectrum in a certain degree, and beyond which the liquefied soil layer significantly amplifies the acceleration components in the spectrum.
出处
《世界地震工程》
CSCD
2004年第3期33-38,共6页
World Earthquake Engineering
基金
地震学联合基金(103092)
黑龙江省自然基金(E01-28)资助项目
关键词
液化
土层
地表加速度
反应谱
liquefaction
soil layer
surface acceleration
response spectrum
