煤矸石换填膨胀土路基的沉降研究Replacing Expansive Soil with Coal Gangue in Subgrade Settlement
胡雪松;唐朝晖;万佳文;徐楚;
摘要(Abstract):
针对广西合山市八二路膨胀土路基,考虑采用其附近溯河矿区内煤矸石对膨胀土进行换填。通过对溯河矿区煤矸石及八二路膨胀土进行现场试验及室内实验,研究了其物理力学性质,采用数值模拟技术,探讨了煤矸石换填比例对不同含水率的膨胀土路基路面沉降的影响,取得了以下研究成果:合山地区膨胀土力学性质受其含水率的影响较大,需对膨胀土进行换填;合山市煤矸石散体级配良好,易于压实,适合用作路基填充材料;膨胀土路基在荷载作用下,路面沉降曲线整体上呈对称形式,中间部位相对于两边沉降量更大,对于半路堑路基断面形式,距道路中线同样距离的位置,路面靠近下部边坡的一侧沉降量更大;随着换填比例的增加,路面最大沉降量和差异沉降量明显减小,根据模拟结果建议将合山市八二路膨胀土路基换填3.5m厚的煤矸石。
关键词(KeyWords): 煤矸石;膨胀土;颗粒级配;路基沉降;数值模拟
基金项目(Foundation): 国家自然科学基金项目(41572256);; 国家矿山地质环境治理专项重点工程项目(合山市矿山地质环境治理)(2012011120028)
作者(Author): 胡雪松;唐朝晖;万佳文;徐楚;
Email:
DOI: 10.19509/j.cnki.dzkq.2017.0630
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