大轴重条件下重载铁路路基变形特性研究

随着重载铁路列车轴重的不断增加,作用于路基上动应力也随之增大,进而引起路基塑性变形和弹性变形的增大,严重影响了列车的安全运行。通过对路基现场动态测试和室内分级加载动三轴试验,分析了不同压实度的重载铁路路基土体的塑性变形和弹性变形随动应力增大的变化规律,为预测轴重增加条件下的路基稳定性及变形的发展规律提供依据。

On Deformation Characteristics of Heavy-haul Railways Subgrade under Heavy Axle Load

As the train axle load on heavy-haul railway increases continuously, the dynamic stress applied to the subgrade increases, and further leading to enhancement of plastic and elastic deformations thereof, thus making adverse impact on the train’s operation. Through on-site dynamic testing on the subgrade and indoor multi-stage loading dynamic triaxial test, the rules that how the plastic and elastic deformations of soil mass in different degrees of compaction therealong increase with the dynamic stress, was analyzed, which provides important basis to forecast the development rules of subgrade stability and deformation under increase of axle load.