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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,分析了高路堤和低路堤在模拟列车动荷载作用下的工程特性。测试结果表明,低路堤段动应力衰减系数在路基面以下相对应处与高路堤的衰减系数基本相同;低路堤和高路堤的弹性变形最大值分别为0.39 mm和0.48 mm,在允许范围之内;高路堤与低路堤的塑性变形最大值分别为0.7 mm和1.5 mm;高路堤在干态情况下动刚度系数约317 MPa,暴雨后下降到220 MPa/m;低路堤路基综合动刚度最后均为356 MN/m。改良土厚度不同造成路基的综合动刚度不同。
Through in-situ dynamic tests on expansive soil sections in Hefei-Ning-Expressway, the engineering characteristics of high-embankment and low embankment under simulated train dynamic loads are analyzed. The test results show that the attenuation coefficient of dynamic stress of low embankment section is basically the same as the attenuation coefficient of high embankment below the subgrade surface. The maximum elastic deformation of low embankment and high embankment are 0.39 mm and 0.48 mm, respectively, within the allowable range ; The maximum plastic deformation of high embankment and low embankment are 0.7 mm and 1.5 mm respectively; the dynamic stiffness coefficient of high embankment in dry condition is about 317 MPa, and then decrease to 220 MPa / m after heavy rainfall; finally the final dynamic stiffness of low embankment embankment 356 MN / m. The result shows that the improved composite soil stiffness results in different dynamic stiffness of roadbed.