路基粉土压实特性及其力学效应试验研究

针对公路路基粉土工程特性,进行了击实试验、三轴试验和微观结构分析,绘制了不同击实功作用下粉土的干密度曲线,得到了压实度和孔隙比之间的变化规律,探讨了不同压实度的粉土的力学效应,阐述了不同击实度的粉土微观结构排列形式。试验结果表明：通过掺入粗颗粒改变粉土级配,并不能有效地改变其压实特性;现行的重型击实标准对于粉土是可行的,但压实标准偏低;随着压实度的增加,粉土的黏聚力降低,内摩擦角增大;在压实过程中,随着压实度的增加,粉土填充孔隙的效果较差。

Experimentation Study on Compaction Property of Silt Earth Fill Foundation and Its Mechanical Effect

By the compaction tests,triaxial tests and microstructure analysis,the dry density curves of silt soil under different compact efforts is drawn,the relationship between compactness and porosity ratio is obtained and its mechanical effect under different compactness is discussed,then the arrange format of soil＇s microstructure under different compactness is exposited.It is shown that the compact property of silt can not be changed by incorporating the coarse granule.Current heavy compact standard is suitable for silt,but the standard is lower.With the increase of compactness,the shear strength of silt soil is decreased,internal friction angle is increased and the pore space of silt can not be filled up sufficiently.