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为深入研究回填压实黄土的压缩变形特性与湿陷变形特性,对新区高填方33 m深度范围内的回填压实黄土开展了一系列室内压缩、固结、湿陷试验。研究结果表明:高填方不同深度现场回填压实黄土均具有中、高压缩性;结构屈服压力对现场回填压实黄土的压缩变形特性和湿陷变形特性均有较大影响,在含水率和压实度相近条件下,结构屈服压力越大,回填压实黄土的压缩性越小;不同深度的现场回填压实黄土均有湿陷性,且均存在峰值湿陷系数,峰值湿陷压力出现在其结构屈服压力附近。试验成果可为制订黄土高填方的施工质量标准提供参考依据。
In order to further study the compressive deformation characteristics and collapsible deformation characteristics of backfilled compacted loess, a series of indoor compression, consolidation and collapsible tests were carried out on the backfilled compacted loess within a depth of 33 m in the new high-fill area. The results show that both high compressibility and high compressive strength of backfilled compacted loess at different depths have a significant impact on the compressive deformation and collapse characteristics of backfilled compacted loess, Under the similar compaction conditions, the larger the yield stress of the structure, the less compressibility of backfilled compacted loess; at different depths, the backfilled compacted loess has collapsibility and both have peak collapsibility coefficient and peak collapsible pressure appear Near the structural yield pressure. The test results can provide a reference for the formulation of construction quality standards for loess high-fill.