斯里兰卡泥炭质土物理力学特性研究

Research on Physical and Mechanical Characteristics of Peaty Soil in Sri Lanka

基于292个泥炭质土土样室内试验成果,对斯里兰卡泥炭质土主要物理力学性质指标数值分布特征进行研究,进一步与云南滇池、吉林地区泥炭(质)土特性进行比较、分析,得出:斯里兰卡泥炭质土物理力学指标主要分布范围及平均值;斯里兰卡泥炭质土有机质含量低于滇池地区、吉林地区,斯里兰卡泥炭质土天然密度、天然孔隙比、天然含水率、液限、塑性指数、液性指数离散性大于滇池地区、吉林地区,斯里兰卡泥炭质土塑性指数大于滇池地区,斯里兰卡泥炭质土天然含水率及液性指数大于滇池地区、吉林地区;3个地区泥炭(质)土快剪黏聚力平均值较为接近,吉林地区泥炭(质)土快剪及固快内摩擦角数值均明显大于斯里兰卡和云南滇池地区,泥炭(质)土固快试验强度增长20%以上;吉林地区泥炭(质)土压缩系数最大,斯里兰卡泥炭质土压缩系数略低于吉林地区,滇池地区泥炭(质)土压缩系数最小;各指标趋势线走向初步表明,斯里兰卡泥炭质土物理力学性质指标之间存在统计相关性。

Based on 292 laboratory test results of peaty soil,studies on distribution feature of the key physical and mechanical characteristic indexes of peaty soil in Sri Lanka are conducted.Comparison and analysis in terms of peaty soil characteristics in and among Sri Lanka,Dian Lake area and Jilin area are further carried out.It is concluded that:distribution range and average value of physical and mechanical property indexes of peaty soil in Sri Lanka is obtained;organic content of peaty soil in Sri Lanka is lower than that in Dian Lake area and Jilin area,discreteness of natural density,natural void ratio,natural moisture content,liquid limit,plasticity index,liquidity index for peaty soil in Sri Lanka is greater than that in Dian Lake area and Jilin area,plasticity index of peaty soil in Sri Lanka is higher than that in Dian Lake area,natural moisture content and liquidity index of peaty soil in Sri Lanka is greater than that in both Dian Lake area and Jilin area;average value of cohesion of fast shear test for peaty soil in Sri Lanka is close to that in the other two areas,interior friction angle value in both fast shear test and compression shear test for peaty soil in Jilin area is obviously greater than that in the other two areas,the compression shear test strength after compression increases more than 20%;compression coefficient value of peaty soil in Jilin area is the highest one,and compression coefficient value of peaty soil in Sri Lanka is a little lower than that in Jilin area,compression coefficient value of peaty soil in Dian Lake is the least;tendency of trend line for the indexes of peaty soil simply indicates that there is statistical correlation between the characteristic indexes of peaty soil in Sri Lanka.