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裴利华; 杨醒宇; 桂跃; 王兆昌; 张毅
水文地质工程地质, 03/2022, Volume: 49, Issue: 2Journal Article
TU411.2; 富含有机物质是泥炭土工程性质不良的主要原因.不同有机质含量及组分的泥炭土,其物理力学性质差异很大.为明确有机质含量的影响,对数十组不同有机质含量无定形泥炭土试样进行一系列室内试验,系统分析了物理、变形、强度及渗透性随有机质含量的变化规律;为比较有机质组分不同导致的工程性质差异,将以上无定形泥炭土物理力学指标与纤维泥炭土试验数据进行系统分析.结果表明:无定形泥炭土基本物理力学指标与有机质含量间有一定的线性关系,其中,初始孔隙比(e0)、天然含水率(w0)、液塑限(wL、wp)、黏聚力(c)随有机质含量增加线性增大,比重(Gs)、固结系数(Cv)和内摩擦角(φ)随有机质含量增大而减小.相较无定形泥炭土,纤维泥炭土比重小、含水率大、孔隙比大.抗剪强度方面,无定形泥炭土黏聚力随有机质含量增大而增大,较纤维泥炭土略高;内摩擦角随有机质含量增大而有下降趋势,约为纤维泥炭土的1/5~1/14.渗透性方面,无定形泥炭土的初始渗透系数(kv0)及渗透指数(Ck)随有机质含量增大而减小,且普遍小于纤维泥炭土.
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