垫层级配碎石的性能研究

发布时间：2019-01-12 20:34

【摘要】：为得到垫层级配碎石的合理组成,用重型击实、承载比(CBR)、渗透系数和水稳定性试验对6种级配碎石进行了室内研究。结果表明:渗透力会改变级配碎石的级配分布,渗透系数随渗透次数增加趋于稳定,0.075 mm通过率(P0.075)3%的级配碎石渗透系数大于0.011 6 cm3/s但CBR较小;P_(0.075)在3.6%~5.0%范围的级配碎石渗透系数差别很小,选择上限通过率可协调渗水与强度的矛盾;P_(0.075)为7.6%的级配碎石CBR达196%但已基本不透水。有排水要求的级配碎石P_(0.075)5%,填料数量减少使得材料的可压实性对含水率变化不敏感,已不存在最佳压实含水率;重型击实使得P0.0753%的级配碎石严重破碎,干密度异常提高不宜作为压实标准。级配碎石在成型后初期具有轻微的湿陷性,其水稳定性与强度明显相关,CBR越高的级配碎石水稳定性也越好。
[Abstract]:In order to obtain the reasonable composition of graded crushed stone, six graded crushed stones were studied in laboratory with heavy compaction, (CBR), permeability coefficient of bearing ratio and water stability test. The results show that the permeability will change the gradation distribution of graded crushed stone, and the permeability coefficient tends to be stable with the increase of permeability times. The permeability coefficient of 0.075 mm pass rate (P0.075) 3% gradation gravel is more than 0.011 6 cm3/s, but CBR is smaller. The permeability coefficient of graded macadam P0.075 in the range of 3.6% and 5.0% is very small. The choice of upper limit pass rate can coordinate the contradiction between seepage and strength. The CBR of graded macadam with P _ (0.075) of 7.6% is 196% but almost impervious. With the decrease of packing quantity, the compactability of the material is insensitive to the change of moisture content, and there is no optimum compaction moisture content. Heavy compaction makes P0.0753% graded macadam seriously broken, and the abnormal increase of dry density is not suitable for compaction standard. Graded crushed stone has slight collapsibility at the initial stage of molding, and its water stability is obviously related to its strength, and the higher the CBR is, the better the water stability of graded crushed stone is.
【作者单位】：重庆市智翔铺道技术工程有限公司;招商局重庆交通科研设计院有限公司云南省龙江特大桥钢桥面铺装及路面工程工地试验室;
【分类号】：U414

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