湘南红黏土公路路基压实度标准研究

发布时间：2018-02-23 05:42

本文关键词： 道路工程红黏土室内土工试验压实度标准含水率控制　出处：《公路交通科技》2017年02期 　论文类型：期刊论文

【摘要】：为了探究湘南红黏土公路路基压实标准降低的依据和具体幅度,对红黏土开展了一系列室内土工试验,分析了压实度、含水率对红黏土物理力学特性的影响,获取了渗透率、压实系数、CBR等指标与压实度的关系曲线,最终根据上述指标随压实度的变化规律给出了压实度降低的建议值。研究表明:压实度对红黏土收缩性和膨胀性的影响较小,随着压实度的提高,红黏土的渗透系数和压缩系数均明显降低,而内摩擦角和黏聚力则逐渐增加,但黏聚力在压实度由93%增加到96%过程中没有明显变化,当初始含水率控制在30%左右,压实度大于93%时,红黏土的CBR值均符合规范要求。综合各指标的变化规律,建议湘南地区红黏土路基的压实度可总体降低至93%,且填筑时的含水率应略大于最优含水率。
[Abstract]:In order to explore the basis and specific range of the reduction of the compaction standard of red clay highway subgrade in southern Hunan, a series of laboratory geotechnical tests were carried out on the red clay, and the influences of compaction degree and moisture content on the physical and mechanical properties of red clay were analyzed, and the permeability was obtained. The relation curve between compaction coefficient and compaction degree is given. Finally, according to the change rule of the above indexes with compaction degree, the suggested value of compaction degree is given. The research shows that compaction degree has little effect on shrinkage and expansion of red clay. With the increase of compaction degree, the permeability coefficient and compression coefficient of red clay decrease obviously, while the internal friction angle and cohesion force increase gradually, but the cohesion force does not change obviously in the process of compaction degree increasing from 93% to 96%. When the initial moisture content is controlled at about 30% and the compaction degree is greater than 933, the CBR values of red clay all meet the requirements of the specification. It is suggested that the compaction degree of red clay subgrade in southern Hunan can be reduced to 933 in general, and the moisture content in filling should be slightly larger than the optimal moisture content.
【作者单位】：湖南省交通科学研究院;中南大学土木工程学院;湖南省张桑高速公路建设开发有限公司;湖南省高速公路管理局;
【基金】：交通运输部建设科技项目(2014 318 785 090) 湖南省科技人才专项——湖湘青年英才计划项目(2016RS3037) 湖南省交通科技项目(201310)
【分类号】：U416.1

【参考文献】