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在饱和砂土场地振动过程中,孔隙水的发展会影响土体的有效应力和土骨架对地震波的传播。采用离心机动力试验和数值分析手段对不同强度振动作用下的砂土场地响应进行了研究,并利用观测和计算结果对现行液化评估简化方法进行了分析验证。结果表明:当振动强度较大时,土体的液化将导致加速度急剧衰减;采用完全耦合分析能再现超静孔压的发展和液化对加速度传播的影响,但总应力分析严重高估了地表的加速度;应用简化方法进行液化评估时,确定地表处水平加速度峰值应考虑场地对地震波的放大效应,但应忽略超静孔压的影响。
In the process of saturated sand ground, the development of pore water will affect the effective stress of soil and the propagation of seismic waves to soil skeleton. Centrifuge dynamic test and numerical analysis are used to study the response of sandy soil under different intensities of vibration. The simplified method of liquefaction assessment is validated by the observation and calculation results. The results show that the liquefaction of the soil will lead to the sharp decay of the acceleration when the vibration intensity is large. The complete coupling analysis can reproduce the development of the excess pore pressure and the influence of liquefaction on the acceleration propagation. However, Acceleration. When using the simplified method for liquefaction evaluation, it is necessary to consider the amplification effect of the site on the seismic wave when determining the peak horizontal acceleration at the ground surface, but the effect of excess pore pressure should be neglected.