基于地震荷载下水泥土桩复合地基的破坏机制,采用GDS动单剪仪对水泥土进行动力循环剪切试验,研究水泥掺入比与循环应力比对水泥土动变形、动强度以及软化特性的影响。试验结果表明:水泥掺入比的增加会减缓水泥土动剪应变的发展而动强度则逐渐增强,但循环应力比反之;水泥掺入比为5%,10%,15%的水泥土临界循环应力比分别为0.267,0.286,0.327。通过采用转折应变作为水泥土破坏的标准和数据归一化处理方法,建立了循环应力比和破坏振次的模型。循环荷载作用下,随着循环应力比与循环振次的增大,水泥土的软化指数将减小,半对数模型能够较准确描述水泥土的软化特性。 Based on the failure mechanism of cement-soil pile composite foundation under earthquake load, the dynamic cyclic shear test of cemented soil was carried out by using GDS dynamic single shear device. The effects of cement mixing ratio and cyclic stress ratio on the dynamic deformation, dynamic strength and softening properties of cemented soil were studied. . The results show that the increase of cement mixing ratio will slow down the development of dynamic shear strain of cement soil and the dynamic strength will gradually increase, but the cyclic stress ratio will increase. On the other hand, the cement circulation ratio is 5%, 10% and 15% Stress ratio was 0.267,0.286,0.327. Through the use of turning strain as the standard of cement soil destruction and normalized data processing methods, a model of cyclic stress ratio and failure vibration was established. With the increase of cyclic stress ratio and cyclic vibration, the softening index of cemented soil decreases with the cyclic loading. Semi-logarithmic model can describe the softening characteristics of cemented soil more accurately.