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以京沪高速铁路液化土地区路基为研究对象,采用数值模拟方法,以concrete波为地震波,分析了在该地震作用下路基的动力响应规律及地基液化区域分布。分析结果表明,路基对地震加速度存在放大作用;中、低频段加速度反应谱值较大,主振频率范围为0.5~3.0Hz;当地震加速度为0.1g时,仅路基坡脚附近地表发生小面积液化,当地震加速度为0.15g至0.20g时,地基几乎全部液化,该区域路基地基需进行抗液化处理。
Taking the subgrade of liquefied soil in Beijing-Shanghai high-speed railway as the research object, the dynamic response law of the subgrade and the liquefaction area distribution under the action of the earthquake are analyzed by the numerical simulation method and the concrete wave as the seismic wave. The results show that the subgrade exerts an amplification effect on the acceleration of the earthquakes. The acceleration response spectrum of the medium and low frequency bands is large with the main vibration frequency range of 0.5-3.0 Hz. When the earthquake acceleration is 0.1g, only a small area Liquefaction. When the acceleration of earthquakes is 0.15g to 0.20g, almost all of the foundation is liquefied, and the subgrade in this area needs to be liquefied.