公路路基粉土工程特性试验研究

Experimental study on engineering property of silt soil filled in foundation of highway

为研究公路路基粉土的工程力学特性,评价粉土路基的稳定性,通过室内击实试验、渗透试验、三轴试验和微观结构分析,分析粉土作为公路路基填料的工程力学性质,对比分析不同击实功作用下粉土的干密度特性,探讨压实度和孔隙比之间的变化规律以及不同级配粉土的压实性能,研究不同压实度粉土的渗透特性及其力学效应,阐述不同击实度的粉土微观结构排列形式。研究结果表明:在公路路基填土压实过程中,对于粉土,可采用现行重型击实标准,但压实标准偏低;路基填土的渗透系数随着压实度的增大而呈非线性减小;随着压实度增加,粉土填充孔隙的效果较差。

In order to evaluate and treat the engineering mechanics properties of silt soil filled in foundation of highway, a series of laboratory experiments, such as compaction tests, seepage tests, triaxial tests and microstructure analysis, were studied. The dry density curves of silt soil under different compact efforts were drawn to investigate the compaction property of silt soil filled in foundation of highway. Moreover, the relationship between degree of compaction and porosity ratio under different sized grounds were discussed. Seepage property and mechanical effect of compactness silt soil were studied. Furthermore, the arrange format of soil＇s microstructure under different compactness was studied. The results show that the current standard of heavy compaction is applicable to the compaction of silt soil filled in foundation of highway, but it is lower. The permeability coefficient of silt soil filled in foundation of highway appears to be non-linearity reduction with the increase of compaction. The effect of silt soil filling is worse with the increase of compaction.