有机质对软土次固结特性的影响机制研究

利用洞庭湖软土、高有机质含量泥炭土重塑有机质含量不同的试样,进行一维固结蠕变试验,测定其吸附结合水含量和有机质含量,确定吸附结合水含量与有机质含量的关系,研究有机质含量对软土次固结特性的影响机制.研究结果表明,土中的有机质含量越高,其吸附结合水含量越大,两者呈线性递增关系,并提出了相应的关系计算式;次固结系数与固结压力...

INFLUENCE MECHANISM OF ORGANIC MATTER ON SECONDARY CONSOLIDATION CHARACTERISTICS OF SOFT SOIL

This paper uses Dongting Lake soft soil and high organic matter content peat soil to reshape samples with different organic matter content. It conducts one-dimensional consolidation creep tests to detected the content of adsorbed bound water and organic matter. It then determines the relationship between adsorbed bound water and organic matter content. It analyzes the effect of organic matter content on the secondary consolidation characteristics of soft soil. The research results show that the organic matter in the soil and the adsorbed bound water are linearly increasing: the higher content of organic matter,the greater the content of adsorbed bound water. In view of this,we put forward the corresponding calculation formula. Moreover,the relationship curve between secondary consolidation coefficient and consolidation pressure has a peak point near the structural strength. The secondary consolidation coefficient can be approximately regarded as a constant under the action of large consolidation pressure. In addition,with the increase of organic matter content in soil,the secondary consolidation coefficient increases obviously,especially at high stress level. We discuss its causes in this paper. The research has certain guiding significance for controlling post construction settlement in soft soil area.