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通过合宁快速客运专线膨胀土地段的现场动力试验,分析不同匹配刚度路堤在模拟列车动荷载作用下的工程特性。不同刚度路堤的测试结果表明:(1)不同刚度路堤动应力变化基本相同,基床范围内实测动应力与理论计算结果较接近;(2)弹性变形差异小,分别为0.32和0.29mm;(3)基床表层级配碎石受水或饱水后基床系数会显著降低,动刚度系数约为317MPa/m,暴雨后下降到220MPa/m;(4)塑性变形在加载开始阶段变化较快,振动150万次后塑性变形分别为0.9和1.1mm,塑性变形主要由级配碎石产生,改良土基本没有塑性变形。
Through the dynamic test of expansive soil section of Hening-Passenger Dedicated Line, the engineering characteristics of embankments with different matching stiffness under simulated train dynamic load are analyzed. The test results of embankments with different stiffness show that: (1) The dynamic stress changes of embankments with different stiffness are basically the same, and the measured dynamic stresses in the foundation bed range are close to the theoretical ones. (2) The elastic deformation is small with difference of 0.32 and 0.29 mm, respectively (3) The coefficient of bed coefficient of base graded aggregate graded by water or saturated water will decrease remarkably, the coefficient of dynamic stiffness is about 317MPa / m, and it drops to 220MPa / m after rainstorm; (4) The plastic deformation changes more at the beginning of loading Fast and Vibrations 1500000 times after the plastic deformation of 0.9 and 1.1mm, plastic deformation is mainly produced by graded gravel, improved soil basically no plastic deformation.