有机质对草炭土物理力学性质影响的机理分析  

The mechanism of organic matter effect on physical and mechanical properties of turfy soil

作　　者：吕岩[1] 佴磊[1] 徐燕[1] 刘飞[1] 张敏[1] 

机构地区：[1]吉林大学建设工程学院,吉林长春130026

出　　处：《岩土工程学报》2011年第4期655-660,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(40772169);吉林大学研究生创新基金项目(20101061)

摘　　要：草炭土的有机质含量是决定其物理、力学性质的主要因素。通过对草炭土有机质含量和物理力学指标相关特征的研究,对草炭土的压缩、强度特性在不同有机质含量下产生的力学效应机理进行了分析。结果表明:由于有机质疏松的海绵结构及胶结作用在草炭土团聚体中的主导作用,使有机质对草炭土物理力学的相关指标和力学效应均有明显的控制作用。有机质含量的增加使草炭土的压缩性增大,固结系数降低,渗透性下降,对主固结产生很大影响,同时也使有机质中腐殖质的胶结作用相应增强,从而使黏聚力相应增加。上述特性的研究,对于草炭土地区地基处理方案的选择有指导意义,同时为深入研究草炭土的结构特性奠定了基础。The organic content is the main factor of the physical and mechanical properties of turfy soil.Through the characterization study on the organic content of turfy soil as well as its physical and mechanical indexes,the mechanism of mechanical effects resulting from the compression and strength properties of turfy soil with different organic contents is analyzed.The results show that because of the leading role of the porous sponge structure of organic matter and its cementation in the aggregates of turfy soil,the organic matter plays a significantly controlling role both in the relative physical and mechanical indexes and in the mechanical effects.With the increase of organic content,the compressibility of turfy soil rises,the coefficient of consolidation decreases and the permeability goes down,which inserts a great influence on its primary consolidation,and at the same time strengthens the humic cementation of organic matter so as to increase the cohesion.The above property analysis is instructive and meaningful to the solution selection of foundation treatments,and lays the foundation of studying the structure properties of turfy soil as well.

关 键 词：草炭土 有机质 试验研究 力学效应 土力学 

分 类 号：TU411[建筑科学—岩土工程]