摘要
通过10 m×2.5 m×4.1 m(长宽高)的大型模型试验,研究了深层浸水条件下膨胀土地基膨胀变形和含水率变化规律,进行了含水率、表面隆起、深层隆起等测试。试验结果表明,土体干密度和上覆荷载对膨胀变形和含水率变化影响较大,土体含水率的变化可分为起始、突变、稳定3个阶段;上覆荷载越大,土体表面隆起越小,表明上覆荷载能有效抑制膨胀土膨胀变形;膨胀土地基可划分为压密区、中性区和膨胀区3个变形特征区,或3个区的组合,变形区的高度不仅与外加压力值有关,且与基础大小和形状有关。研究结果对膨胀土路基的设计和施工具有重要的理论和工程实际意义。
A large model test of 10 m × 2.5 m × 4.1 m in length, width and height was carried out to study the swelling deformation and water content of expansive soil foundation under deep inundation.The water content, surface heave and deep heave were measured in the test. It is indicated that, the swelling deformation and water content are influenced by the dry density of soil and the pressure of foundation; the water content-time curves can be divided into initial, sudden and steady phases; the larger the overburden pressure is, the less the surface heave is, so the swelling deformation would decrease with the increase of overburden pressure; the deformation characteristics of expansive soil foundation can be divided into compression, no deformation, swelling deformation, or the composite; the depth of swelling deformation is related to the presure, size and shape of foundation. The test is instructive for design and construction of expansive soils roadbed.
出处
《公路交通科技》
CAS
CSCD
北大核心
2008年第5期51-55,共5页
Journal of Highway and Transportation Research and Development
基金
交通部西部交通建设科技资助项目(200231874616)
关键词
道路工程
膨胀土地基
模型试验
膨胀变形
含水率
road engineering
expansive soil foundation
model test
swelling deformation
water content
