花岗岩残积土路用性能影响因素研究

发布时间：2018-04-26 12:39

本文选题：路用性能 + 影响因素　；参考：《水文地质工程地质》2017年05期

【摘要】：为了分析花岗岩残积土路用特性,从影响因素入手研究。取湖南境内花岗岩残积土进行室内试验,通过薄片和XRD试验,得到残积土矿物成分及基本结构,发现云母含量较高且呈叠片状结构;通过大量统计与试验,从粒径组成、击实功、含水率三个因素出发,研究残积土路用特性变化。结果表明:细砂对残积土含水性影响关键,粗粒含量与CBR强度呈指数关系,特定粒径组成对残积土路用特性有利;以黏土质砂为试验对象,击实功增加,最大干密度增速"两头大、中间小",最优含水率降速"两头小、中间大",最大CBR值先线性增加后基本不受影响;结合击实功进行分析,含水率存在wcr,小于wcr,击实功与CBR正相关,反之负相关。
[Abstract]:In order to analyze the road characteristics of granite residual soil, the influence factors are studied. Taking granite residual soil in Hunan province for laboratory test, the mineral composition and basic structure of residual soil are obtained through thin slice and XRD test, and it is found that mica content is high and is laminated structure, through a large number of statistics and tests, the composition of grain size is obtained. Based on three factors, compaction work and moisture content, the characteristics of residual soil are studied. The results show that the influence of fine sand on residual soil water content is critical, the content of coarse grain is exponentially related to CBR strength, the specific particle size composition is favorable to the road characteristics of residual soil, and the compaction work of clay sand is increased when the clay sand is taken as test object. The maximum dry density growth rate is "big at both ends and small in middle", and the optimal moisture content is "small at both ends and large in middle", and the maximum CBR value increases linearly first and then is not affected basically, and the moisture content exists wcrs, less than wcrs, and the compaction work is positively correlated with CBR, in combination with compaction work, the maximum dry density growth rate is "large at both ends" and "small in the middle". Vice versa.
【作者单位】：中南大学地球科学与信息物理学院;
【分类号】：U414

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