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提出了既有线路基状态在运营条件下测试的方法,并在现场进行了相关测试。测试数据表明,轨枕端头处的动态变形模量值(Evd值)和轻型动力触探锤击数(N10)大于路肩上测得的相应值,改良土在道砟下层粗砂的保护下可以较长时间保持较高的承载力与动态变形模量。动态变形模量与N10有一定的相关关系,对N10可以正常测试的情况,其线性相关性非常显著,而当N10是通过换算得出时,线性相关性不显著。讨论了过渡段的加固与不加固的控制标准,结合实例说明当Evd值满足要求时,基床底层仍有可能存在软弱层,建议用Evd值和N10值综合评价过渡段是否进行加固。
The method of testing the existing state of the subgrade under operating conditions was put forward and relevant tests were carried out in the field. Test data show that the dynamic deformation modulus (Evd value) at the end of the sleeper and light dynamic probe hammering (N10) is greater than the corresponding value measured on the shoulder, the modified soil can be protected under the lower gob of grit For a long time to maintain a higher bearing capacity and dynamic deformation modulus. The dynamic deformation modulus has a certain correlation with N10. The linear correlation is very significant for the case that N10 can be normally tested. However, when N10 is obtained by conversion, the linear correlation is not significant. The control criterion for the reinforcement and non-reinforcement of the transitional section is discussed. The example shows that when the Evd value meets the requirement, there may still be weak layers in the bottom of the bed. It is suggested that whether the transitional section should be reinforced by Evd and N10 values.