摘要
以皖南山区G318青阳段改建工程的全风化花岗岩物理改良路基填料为研究对象,通过大型直剪试验研究其抗剪强度指标,探讨该改良填料的强度特性。研究结果表明:改良料具有较好的抗剪强度指标,表现为黏聚力较小,内摩擦角较大;抗剪强度随着含水率的增大呈减小趋势,在最佳含水率±3%的变化程度较小,施工时可以放宽填料含水率3个百分点进行填筑;在饱和时,抗剪强度降低约1/4,施工时应严防路基受水浸泡;压实系数的增大可以提高改良料的抗剪强度,增强其水稳定性;最大粒径对改良料的强度指标影响与粗颗粒含量有关,不可单独作为评价改良料强度的影响因素。
Taking the physically modified completely weathered granite subgrade filler of G318 recon-struction project in Qingyang County as the research object, its shear strength indexes and intensity char-acters are discussed through large direct shear test. The results prove that： the modified filler has good shear strength indexes, the cohesion is small and internal friction angle is large;the shear strength shows a trend of decrease with the increase of moisture content, the change of shear strength is small with 3%near the best moisture content of the improved filler, the moisture content of improved filler can be in-creased or decreased by 3%during construction;when the filler is saturate, the shear strength decreases nearly 25%, the subgrade cannot be soaked by water;the shear strength can be advanced and the water stability can be enhanced with compaction coefficient increase;the impact of max particle size on shear strength indexes relates to the coarse particle content, which cannot be used to evaluate the intensity of the improved filler separately.
出处
《交通标准化》
2014年第21期103-106,110,共5页
Communications Standardization
关键词
全风化花岗岩
路基填料
物理改良
强度特性
completely weathered granite
subgrade filler
physical improvement
intensity character
