摘要
将K0固结仪改装成高压固结—渗透联合测定试验仪,对上海地区滨海相原状软粘土试样、重塑软粘土试样和粉土试样进行了固结—渗透联合测定。对比分析了不同荷载和水头耦合作用下上海软土的变形及渗透特性,并对上海软土试样垂直向和水平向的e-k关系曲线进行了拟合,得到了孔隙比和渗透系数的关系表达式。试验结果表明:结构性对上海软土的固结特性具有显著影响,具有架空结构的原状软土试样的压缩率明显高于重塑软土试样和粉土试样;在相同固结压力作用下,渗流水头越高,软土试样固结变形速率越快。研究成果对于研究滨海地区地面沉降和地下水渗流具有重要参考价值。
By using the osmotic oedometer and modifying the K0 consolidometer, the combined determination of osmosis and consolidation on Shanghai natural soil, remolded soil and silty clay samples are carried out. The comparative analysis is made on the deformation and permeability of Shanghai soft soil under different loads and water heads. According the vertical and horizontal e-k curves of the soft clay, the expression for the permeability coefficient and the void ratio is fit out. The tests indicate that, the structural properties significantly influence the consolidation characteristics of Shanghai soft soil, the compressibility of the undisturbed soft soil is higher than that of the remolded soil and silty clay. Under the same consolidation pressure, the higher of the water head, the faster of the consolidation deformation. The study results are of important significance to the study on the ground subsidence and groundwater seepage in marine areas.
出处
《工程勘察》
CSCD
北大核心
2011年第12期6-10,共5页
Geotechnical Investigation & Surveying
基金
国家自然科学基金青年科学基金项目(40902092)
关键词
滨海相软土
固结—渗透联合测定
渗透系数
孔隙比
marine soft soil
combined determination of osmosis and consolidation
permeability coefficient
void ratio
