PERMANENT DEFORMATION CHARACTERISTICS OF SUBGRADE SOILS DUE TO REPEATED LOADING
PERMANENT DEFORMATION CHARACTERISTICS OF SUBGRADE SOILS DUE TO REPEATED LOADING
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DOI：
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发表时间：
1975
影响因子：
1.7
通讯作者：
C. Monismith;N. Ogawa;C. Freeme
中科院分区：
文献类型：
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作者：
C. Monismith;N. Ogawa;C. Freeme
各种程序进行检查，以控制或估计路基的贡献，发生在路面结构中的总永久变形的结果，重复的交通荷载。建议采用分层弹性分析方法估算路基表面的竖向压应变，作为控制此类变形的一种方法。包括可用应变数据的总结。如果将这些标准用于设计目的，则必须使用与制定标准相同的沥青结合层刚度范围和泊松比值。本文还建议采用分层弹性分析方法来估算路基的永久变形量。这种分析是基于永久应变之间的关系，施加的应力，和应力应用的重复加载三轴压缩试验的基础上，这些关系进行了讨论。数据还表明应力历史效应的重要性。时间硬化和应变硬化允许从单一应力水平下的试验结果估计累积载荷效应。虽然这两种方法都不能精确预测不同应力序列下永久应变的累积，但两者都限制了测量数据，因此有可能帮助估计累积交通荷载的变形或车辙。
Various procedures are examined for controlling or estimating the contribution of the subgrade to the total permanent deformation that occurs in the pavement structure as a result of repeated traffic loads. The use of layered elastic analysis to estimate the vertical compressive strain at the subgrade surface is suggested as one procedure to control such deformation. A summary of available strain data is included. If these criteria are used for design purposes, the same range in stiffness for the asphalt-bound layer and the same values of Poisson's ration must be used as were used to develop the criteria. Layered elastic analysis is also suggested for estimating the amount of permanent deformation caused by the subgrade. This analysis is based on relationships among permanent strain, applied stress, and number of stress applications based on repeated-load triaxial compression tests; and these relationships are discussed. Data also indicate the importance of stress history effects. Time hardening and strain hardening permit estimates of cumulative loading effects from the results of tests at single stress levels. Although neither method predicts precisely the accumulation of permanent strain under different stress sequences, both bound the measured data and therefore have the potential to assist in the estimation deformation or rutting from cumulative traffic loading.