含水率与轻型动力触探<i>N</i><sub>10</sub>对既有重载铁路路基压实度指标变化关系研究

肖尊群; 李志平

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

Research on existing overloaded railway subgrade compaction index changing in relation to N₁₀ and moisture content separately

摘要

摘要: 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。

Abstract: 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.

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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

Research on existing overloaded railway subgrade compaction index changing in relation to N10 and moisture content separately

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

Research on existing overloaded railway subgrade compaction index changing in relation to N₁₀ and moisture content separately