客运专线路基压实检测指标的试验研究

Analysis of compaction standards used in high-speed railway subgrade

针对我国客运专线路基压实检测方法和检测指标过多,利用武广客运专线岳阳段2种典型填料的击实试验和现场4种检测方法的检测结果,对路基压实检测方法与检测指标进行分析。研究结果表明:对中、粗颗粒填料用统一的孔隙率来控制压实度具有不合理性,基床底层的28%和本体的31%的孔隙率要求与相应的压实度95%与92%不匹配;一次变形模量Ev1和地基系数K30之间有较好的相关性,可用同一函数进行拟合,当K30为150 MPa/m时,Ev1约为35 MPa;建议完善路基压实检测方法,修正检测指标以保证路基压实质量,简化路基压实检测的程序。

The quality control and quality assurance tests used during high -speed railway subgrade construction in Wu Guang passenger transportation line were introduced. Through laboratory proctor compaction tests and in - situ tests using two kinds of filling materials, the relationship between compaction grade and porosity were obtained. The relation between K30, and Ev1 was analyzed, and reasonable controlling indexes for porosity used in the high - speed railway for middling grained and coarse grained soil were proposed. The different stiffness coefficients for the subgrade were studied by field tests through the plate load tests, and the relation between them was obtained. Finally some suggestions on compaction quality inspection of subgrade were proposed .