土石混合料的压实特性研究

基于某大型场平工程填筑质量抽检结果,探讨了粗料含量(粒径大于5mm颗粒含量)、填料最大粒径以及填料级配情况对土石混合料现场压实特性的影响。研究发现:当粗料含量逐渐增加时干密度呈逐渐增大趋势,但达到90%左右时,干密度离散性较大,建议粗料含量的合理值为60%～80%;同样,当填料最大粒径逐渐增大时干密度也随着最大粒径的增大而呈逐渐增大趋势,但当超过松铺厚度(800mm)的30%以后,干密度则逐渐减小,且离散性较大,建议最大粒径的合理值为松铺厚度的30%;填料级配良好与否和压实特性无明显的相关性,但级配应连续。该研究对类似工程有一定的借鉴意义。

Research on compaction properties of soil-aggregate mixture

Based on the field test results of dry density for a project, the influences of the maximum grain size, coarse material content (percentage of coarse material diameter above 5 mm) and gradation on compaction properties of soil-aggregate mixture are discussed. The results indicate that dry density increases gradually when coarse material content increases; dispersion of dry density is greater when it is about 90%. The reasonable coarse material content which is 60% - 80% is suggested. Dry density increases gradually while maximum grain size increases. Dry density decreases and the dispersion is greater, when the maximum grain size over a certain value. So the maximum grain size which is about 30% of the loose thickness (800 mm) is suggested. There is no obvious correlation between gradation and compaction properties, but the gradation should be continual. This study may have a certain significance to similar projects.