海泥海砂混合料最大干密度确定方法研究

发布时间：2018-02-16 19:11

本文关键词： 最大干密度室内试验海砂海泥　出处：《科学技术与工程》2017年08期 　论文类型：期刊论文

【摘要】：海泥海砂混合料能否作为海堤填料,很大程度上取决于混合料的最大干密度。因此,如何准确确定最大干密度就显得至关重要。通过轻型击实试验、相对密实度试验、振动台试验等室内试验对海砂海泥混合料最大干密度确定方法进行比较分析研究,得出以下结论:当海泥含量比较多时,击实法得到的干密度大于振动台法,这主要是由于击实试验采用的为干法;在粉碎过筛的过程中,土体结构遭到破坏,土体中的含水率明显变小;而振动台法则直接采用原样土进行试验,更符合现场施工情况。从不同比例掺合料的含水率来看,当海砂海泥比例小于1.5∶1时,此时的掺合料处于饱和状态,采用振动台法更加适合;当海砂海泥比例大于1.5∶1时,混合料含水率小于饱和含水率,相对密实度法得到的结果较振动台法更加准确,此时应采用相对密实度法确定最大干密度。
[Abstract]:Whether sea mud and sea sand mixture can be used as seawall filler depends to a great extent on the maximum dry density of the mixture. Therefore, it is very important to determine the maximum dry density accurately. The methods of determining the maximum dry density of sea sand and sea mud mixture are compared and analyzed in laboratory tests such as shaking table test. The following conclusions are drawn: when the sea mud content is high, the dry density obtained by compaction method is greater than that obtained by shaking table method. This is mainly due to the dry method used in compaction test. During the process of crushing and sifting, the soil structure is destroyed and the moisture content in the soil is obviously reduced. From the point of view of the moisture content of the admixture in different proportions, when the ratio of sea sand and sea mud is less than 1.5: 1, the admixture is in a saturated state, and the vibratory table method is more suitable; when the ratio of sea sand and sea mud is greater than 1.5: 1, The results obtained by relative compactness method are more accurate than those obtained by shaking table method, and the maximum dry density should be determined by relative compactness method.
【作者单位】：河海大学岩土工程研究所;河海大学岩土工程水利部重点实验室;浙江省水利河口研究院;上海勘测设计研究院有限公司;
【基金】：国家自然科学基金项目(51009054)资助
【分类号】：U654

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