改性砂土的力学性质

Research on Mechanical Properties of Improved River Sands

针对河湖网地区天然沉积砂土因施工压实及稳定性难以达到设计要求等问题,结合实际工程,着重对掺入不同比例粘土后河砂的压实性以及抗剪强度进行分析研究。通过击实试验、固结试验以及直接剪切试验,得出相应的击实曲线、压缩模量以及最大摩擦角的变化曲线,并对结果进行比较分析,说明在天然河砂中掺入适当比例粘粒后,其相关力学性能有了很大程度的提高,并得出了粘土掺入量的合理比例,为改性后河砂用于工程建设提供了依据。

Focusing on the fact that properties of compaction and stability of natural depositing sandy soil in rivers and lakes is unsatisfied the design requirement due to the difficulty of construction,the compaction and shear strength of river sands with clays in different scales is studied combined with the engineering.By experiments of compaction,solidification and directly shearing,the curve of compaction,compression modulus and the maximum friction angle are obtained.Results show that the mechanical properties of river sands with clays in different scales is improved,then the proper scale of clay is obtained,which is provided as the reference for its usage in engineering.