泥砂互混吹填土自重沉积及颗粒分布规律

发布时间：2018-01-19 13:41

本文关键词： 泥砂互混吹填土泥面沉降量沉降速率含砂比密度剖面　出处：《岩土力学》2017年S1期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Large scale settlement column test was carried out to obtain the basic characteristics of mud surface settlement and settlement rate of mud sand with different initial sand content ratio and different initial moisture content under the action of self-weight. The density profile and particle distribution of the sample along the height direction were obtained by using the stratified extraction method. The experimental results show that the sediment and particle distribution law and initial sand content ratio of mud-sand mixed fill soil are obtained. The increase of initial sand content ratio can significantly increase the sedimentation amount, and there exists a reasonable sand content ratio, which decreases after the increase of the initial sand content ratio, and the lower the initial water content is, the more obvious this phenomenon is. The settled-time curve can be divided into three stages, among which the second stage presents obvious nonlinear characteristics, with the decrease of initial moisture content, the three stages and nonlinear characteristics are not obvious. The density profile has the characteristics of step change and the linear character gradually with the decrease of the initial water content and the initial sand content ratio. The initial sand content ratio and initial water content both affect the particle distribution pattern of the mud-sand mixed filling soil. The larger the initial sand content ratio and the initial moisture content, the more favorable the particle size is more than 0.075 mm. The larger the initial sand content ratio is, the more the particle size is less than 0.005 mm at the bottom, which shows the characteristics of group sedimentation.
【作者单位】：武汉二航路桥特种工程有限责任公司;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：湖北省科技支撑计划项目(No.2013BGH006) 湖北省自然科学基金(No.2014CFB370)~~
【分类号】：TU43
【正文快照】： This work was supported by the Natural Science Foundation of Hubei(2014CFB370)and the Hubei Science and Technology Support Program(2013BGH006).汕头市东部城市经济带市政基础设施建设项目区域内的吹填堆场位于韩江三角洲网河出海口区域,工程建设范围为东经116°45

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