含水率与轻型动力触探N10对既有重载铁路路基压实度指标变化关系研究

摘要

The railway subgrade compaction indexs of foundation coefficient K30,dynamic elastic modulus Evd,the second rebound modulus EV2, the second resilient modulus and a second resilient modulus EV2 / EV1,light dynamic penetrationN10,and moisture content w were obtained by field test in SHU-HUANG railroad.Based on the above datas,The changing relationship of foundation compaction indexes-K30,Evd,EV2,EV2/EV1,N10,and moisture content w separately were researched.The mentioned estimation methods in K30,EV2,EV2/EV1,Evd being estimated by use of N10 were proposed.The applicable conditions of estimation method was obtained through examples verification:① the silty clay as main filler was belong to c group,the moisture content being 8％～14％;② N10 range was 17～30,and EV2/EV1 was estimated to fix error.The results were shown:The method proposed was great importance,for the existing heavy rail roadbed filler Group C rapid detection and evaluation.%通过朔黄铁路现场路基压实度指标地基系数K30、动弹性模量Evd、二次回弹模量EV2、二次回弹模量与1次回弹模量比EV2/EV1、轻型动力触探击数N10测试实验数据和含水率w测试实验数据.基于以上数据研究含水率对地基压实指标K30、Evd、EV2、EV2/EV1和轻型动力触探击数N10之间的变化关系.并且提出动力触探击数N10估算K30、EV2、EV2/EV1、Evd的估算方法.通过实例验证得出该估算方法的适用条件:①为含水率8％～14％,且以粉质黏土为主体填料的C组填料;②锤击数范围17～30击.而且在对EV2/EV1的估算时,需要谨慎对待,注意误差修正.研究结果表明:该方法对于既有重载铁路C组填料路基的快速检测评估具有十分重要的意义.