弱～强风化泥质粉砂岩物理改良试验研究

通过对天然状态下弱～强风化泥质粉砂岩的物理力学性质分析,提出采用掺入中粗砂来改良使其作为高速铁路路基填料的办法.并设计不同中粗砂掺入量情况下,弱～强风化泥质粉砂岩的击实试验、颗粒分析试验和CBR试验,以获得最大干密度、最佳含水量、颗粒级配和CBR值随中粗砂掺入量的变化规律,并通过对其碾压前后,以及干湿筛法土样的压实特性进行研究,从而确定最佳的物理改良方法.

Study on Physical Modified Tests on Weak-strong Weathered Argillaceous Siltstone

After analyzing physical and mechanical properties of the weathered argillaceous siltstone,mixing medium coarse sand into the weathered argillaceous siltstone was proposed to improve the stability of the embankment and sub grade in the high speed railway.So the compaction test,Particle size distribution test and CBR tests were designed to find out the relationships between the biggest dry density,the optimum water content,the particle size distribution,the CBR value and the content of medium coarse sand,and the compaction properties were fatherly studied by comparing particle distribution between uncompaced and compacted soil.And then the best modified method was assured.