红砂岩风化土路基填料力学特性研究

Study on Mechanical Properties of Weathered Red Sandstone Soil as Subgrade Filler

红砂岩风化土比较松散,颗粒较均匀,粘聚力较小。红砂岩风化土常作为路基填料,且具有特有的力学性质。选择赣南地区有代表性的红砂岩风化土,对其进行颗粒级配、界限含水率,最大干密度等试验,在此基础上进行了红砂岩风化土的回弹模量、固结试验和CBR试验。采用图表与回归分析相结合的方法分析了红砂岩风化土的单位压力—回弹变形、压力—压缩模量、单位压力—贯入量等性质,对红砂岩风化土作为高等级公路路基填料的施工和质量控制具有重要的指导意义。

Weathered red sandstone soils are more loose and its particles are more homogeneous and less cohesion.Weathered red sandstone soils are often used as subgrade filler and have unique mechanical properties.It selects a representative weathered red sandstone soil from Southern Jiangxi to make experiments on its particle size distribution,boundary water content and maximum dry density.On the basis of experiments,the modulus of resilience test,consolidation test and CBR test are carried on.Using charts and regression analysis methods,the unit pressure-rebound deformation,the pressure-compression modulus,the unit pressure-penetration capacity of weathered red sandstone soils are analyzed.It is of great guiding significance to using weathered red sandstone soil as a kind of high-grade road subgrade filler and its quality control.