改良膨胀土填料的综合试验

Comprehensive Testing on Modified Expansive Soils as Embankment Materials in Hefei-Nanjing Railway

从室内配比试验、填筑试验、质量检测、动态试验及变形观测等角度对膨胀土改良后作为路堤填料的适宜性进行了系统研究。对膨胀土改良后作填料的的设计、填筑施工及质量检测方法、标准提出了建议。通过近4年的开通运营证明合宁铁路膨胀土地区采用改良后的膨胀土作为路堤填料是成功的。

The experimental studies and railway operations observations of the use of modified expansive soils as embankment backfill materials in Hefei Nanning Railway project are presented in this paper. The feasibility of modified expansive soils as railway embankment backfills are studied through laboratory lime-soil mixing ratio, field backfill trial test, quality assurance test and dynamic measurement and deformation observations. The embankment with modified expansive soils was minored throughout four years of operation. The results indicate that the embankment with modified materials is successfully construc- ted. The expansive soil modification design, embankment construction procedure and its quality assurance standard are also proposed in the paper.