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开展大尺寸沉降柱试验,获得不同初始含砂比、不同初始含水率的泥砂互混吹填土在自重作用下的泥面沉降量和沉降速率的基本特征,结合分层抽取法获得试样沿高度方向的密度剖面与颗粒分布变化规律。试验结果表明,泥砂互混吹填土沉积和颗粒分布规律与初始含砂比、初始含水率有较大关系,增加初始含砂比能显著增加沉降量,且存在一个合理含砂比,超过合理含砂比后沉降量反而降低,初始含水率越低该种现象越明显;沉降-时间曲线基本可以分为3个阶段,其中第Ⅱ阶段呈现出比较明显的非线性特征,随着初始含水率降低,3个阶段和非线性特征逐渐不明显;密度剖面呈阶梯变化特征,并随初始含水率和初始含砂比的降低而逐渐过渡到线性特征;初始含砂比和初始含水率均影响着泥砂互混吹填土的颗粒分布模式,初始含砂比和初始含水率越大越有利于粒径大于0.075 mm的颗粒沉积;初始含砂比越大,底部沉积的粒径小于0.005 mm颗粒相对越多,体现出群体沉降特征。
Large-size sedimentation column test was carried out to obtain the basic characteristics of mud-surface sedimentation rate and sedimentation rate of mud-sand interbedded dredged fill with different initial sand ratios and different initial water cut rates, and the combination of stratified extraction method Height direction of the density profile and particle distribution changes. The results show that the sedimentation and particle distribution of sediment mixed with mud and sand are closely related to the initial sand content and initial water content. Increasing the initial sand content ratio can significantly increase the settlement, and there is a reasonable sand content ratio, which exceeds reasonable The sedimentation-time curve is basically divided into three stages, of which the second stage presents a more obvious nonlinear characteristics, with the initial moisture content And the three stages and nonlinear characteristics are gradually not obvious. The density profile shows a step-change characteristic, and gradually changes to the linear characteristic with the decrease of the initial water content and the initial sand content ratio. Both the initial sand content ratio and the initial water content affect The particle distribution pattern of sand-fill interbedded dredger fill, the larger the initial sand content ratio and the initial water content are, the better the deposition of particles with particle size larger than 0.075 mm. The larger the initial sand content ratio, the smaller the sediment particle size is less than 0.005 mm. More, reflecting the characteristics of population settlement.