铁路路基压实性能评价指标分析

Analysis of Evaluation Indexes for Compaction Performance of Railway Subgrade

铁路路基施工中往往通过提高压实度达到增强力学性能的目的.通过建立室内路基压实模型,开展不同的压实度试验,获得不同压实条件下铁路路基质量评价的试验值.经过比较分析,根据反映压实性能的情况,将评价指标分为物理指标和力学指标两类,进而分析各评价指标之间的关系.结果表明,压实度K和孔隙比n呈较好的线性关系;地基系数K_(30)、变形模量E_v、动态变形模量E_(vd)等具有一定相关性,宜选择E_(v2)、E_(vd)作为路基刚度评价的指标;此外,轻型动力触探锤击数N_(10)宜作为强度评价指标.

In railway subgrade construction,the mechanical properties are often achieved by increasing compaction.By building indoor subgrade compaction model,different compaction tests are carried out to obtain the test value of railway subgrade quality evaluation under different compaction conditions,according to the situation of compaction conditions.After comparative analysis,the evaluation indexes are divided into two categories:physical indicators and mechanical indicators,and then the relationship between the evaluation indicators is analyzed.The results show that the compactness K has a good linear relationship with the void ratio n,and the foundation coefficient K30,deformation modulus Evand dynamic deformation modulus Evdshow a certain correlation.Ev2and Evdshould be selected as the evaluation index of subgrade 5R`8 stiffness;in addition,the light dynamic penetration hammer number N10should be used as the strength evaluation index.