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通过开展饱和砂土地基水平振动的离心机振动台试验,研究了振动液化过程中砂土地基的动力响应沿深度的变化规律,发现在液化过程中,由于剪切模量的变化,液化土层与下部未液化土层之间将形成反射界面,后续传来地震波所携带的能量将通过该界面反射至下部土层,导致其动力响应显著变大;同时发现土层在经历液化过程后,其抗液化能力会显著提高,但再次地震时,发生过液化的土层的动力响应也将明显增大。研究结果能够加深对于饱和砂土地基中地震动传播规律的认识,同时也可为验证和改进现有评估砂土液化影响的计算方法提供试验数据。
By carrying out the centrifuge shaking table test on the horizontal vibration of saturated sandy soil foundation, the dynamic response of sand foundation along the depth during vibration liquefaction process was studied. The results show that during the liquefaction process, due to the change of shear modulus, And the lower un-liquefied soil layer will form a reflection interface, followed by the seismic energy carried by the interface will be reflected to the lower soil layer, resulting in a significant increase in its dynamic response; also found that the soil after liquefaction process, its The anti-liquefaction ability will be significantly improved, but the dynamic response of the liquefied soil layer will obviously increase when the earthquake occurs again. The results can deepen the understanding of the law of ground motion propagation in saturated sand ground and provide experimental data for the verification and improvement of existing methods for assessing the liquefaction of sand.