Alternative Testing Techniques for Modulus of Pavement Bases and Subgrades
Alternative Testing Techniques for Modulus of Pavement Bases and Subgrades
复制标题
路面基层和路基模量的替代测试技术
DOI：
10.1061/40821(181)9
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发表时间：
2005
影响因子：
1.6
通讯作者：
T. Edil
中科院分区：
文献类型：
--
作者：
A. Sawangsuriya;P. Bosscher;T. Edil
刚度测量的重要性在路面的岩土工程应用中得到了越来越多的认可。最近采用了两种替代测试技术：弯曲元件和土壤刚度计（SSG），因为它们显示了一些潜在的和有前途的方法来监测路面材料的刚度和/或模量。由于每种技术都有自己的应力和应变水平范围，因此需要在大应变下土壤表现出的弹性模量和非线性行为之间的关系，以便可以将测量的模量调整或校正为对应于所需应变水平的模量。本文介绍了这些测试技术在刚度和/或模量评估路面基层和路基的影响。为了调整在这些材料中测量的模量，必须知道所需的应变幅度。通过大量的有限元分析、大型模型试验和现场试验，总结了典型交通荷载作用下路面基层和路基层的应变。弯曲元件和SSG施加的应变振幅的典型范围进行比较，在路面基层和路基层中发生的，以评估其适用性的路面层刚度和/或模量的评估。最后，这些技术来监测路面层的刚度和/或模量的实际影响提供了一些意见。
The importance of stiffness measurements has gained increased recognition in geotechnical applications in pavements. Two alternative testing techniques: bender elements and soil stiffness gauge (SSG) have been recently adopted as they show some potential and promising means of monitoring the stiffness and/or modulus of pavement materials. Since each technique has its own range of stress and strain levels, the relationship between the elastic moduli and nonlinear behavior exhibited by soils at large strains is required so that the measured modulus can be adjusted or corrected to a modulus corresponding to the desired strain levels. This paper presents the implications of these testing techniques in stiffness and/or modulus assessment of pavement bases and subgrades. To adjust the modulus measured in these materials, the desired strain amplitudes must be known. The strains incurred in the pavement base and subgrade layers that are subjected to the typical traffic loadings are summarized from a number of studies including finite-element analyses, large-scale model experiments, and in-situ test sections. The typical range of strain amplitudes imposed by the bender elements and the SSG is compared with those incurred in the pavement base and subgrade layers to evaluate their suitability in the assessment of pavement layer stiffness and/or modulus. Finally, some comments on the practical implications of these techniques to monitor the pavement layer stiffness and/or modulus are provided.