【摘要】 通过静水沉降试验初步研究了天然河水中常见阳离子Ca2+对泥沙淤积干容重的影响。试验结果表明:①Ca2+浓度对泥沙淤积干容重的影响较大,随着Ca2+浓度增加,干容重的变化分为三个阶段:第一阶段干容重减小,第二阶段干容重增加并达到最大值,第三阶段Ca2+浓度继续增加后干容重减小最后趋于不变;②Ca2+浓度相同的情况下,泥沙浓度对干容重影响根据所加Ca2+浓度不同可分为三个阶段:第一阶段(Ca2+浓度在0~4mmol/l之间)随泥沙浓度增加干容重增加,第二阶段(Ca2+浓度在4~10mmol/l之间)干容重与各泥沙浓度在不同Ca2+浓度下的峰值有关,第三阶段(Ca2+浓度大于10mmol/l)干容重随泥沙浓度增加而增加;③Ca2+浓度、泥沙浓度相同时,中值粒径越大干容重越大,且中值粒径大的沙干容重达到最大值所需Ca2+少。更多还原

【Abstract】 This paper studies the influence of Ca²⁺ concentration on the dry bulk density of sedimentation by settling experiments.The results show that:（1） the influence of Ca²⁺ concentration on the dry bulk density is obvious and the change of dry density with the increase of Ca²⁺ concentration can be divided into three phases,i.e.firstly decrease,then increase to the maximum,and finally maintain stable;（2） under the same Ca²⁺ concentration,the influence of sediment concentration on dry bulk density can also be divided into three phases,i.e.first the density increases with the sediment concentration if Ca²⁺ concentration is 0～4mmol/l,second the density is related to the maximum values of different Ca²⁺ concentration when Ca²⁺ concentration is 4-10 mmol/l,and third the density increases with the sediment concentration under the Ca²⁺ concentration over 10 mmol/l;and（3） when Ca²⁺ concentration is equal to sediment concentration,the dry bulk density increases with sediment median size.更多还原