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Alternative Test Method for Resilient Modulus of Fine-Grained Subgrades

机译：细粒路基弹性模量的替代测试方法

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The mechanistic design of flexible pavement systems requires the specification of mechanical properties for asphaltic concrete, base course, and soil subgrade. The stiffness of the soil subgrade is represented by the resilient modulus, M_r, which is determined in the laboratory from cyclic triaxial tests and is usually a function of the level of applied stress. For a typical pavement project where numerous soils are encountered, cyclic triaxial testing to determine M_r for each subgrade soil may be too complex and time consuming to be applicable on a production basis. Therefore, alternative methods for the determination or estimation of M_r are appropriate and are in fact suggested in the 1993 AASHTO Guide for Design of Pavement Structures (AASHTO Guide 1993). An alternative test method (ATM) was developed based on a falling weight impacting a standard Proctor specimen. A simple theoretical model was used to develop expressions for the modulus and deviator stress as a function of the measured acceleration during impact. An analysis was conducted to compare the state of stress in the ATM with that in a subgrade under a pavement. A prototype device was constructed and used to estimate the resilient response of 14 soils for which standard cyclic triaxial data were available. The ATM results compared well with the results from standard triaxial tests, and the ATM was able to consistently distinguish the low resilient modulus soils from those with high modulus. The ATM was shown to provide results suitable for many design applications and may be useful for reducing the number of standard tests required to characterize the subgrade M_r response for a pavement project.
机译：柔性路面系统的机械设计要求对沥青混凝土，基层和土壤路基的机械性能进行规范。土壤路基的刚度由弹性模量M_r表示，该弹性模量M_r在实验室由循环三轴试验确定，通常是所施加应力水平的函数。对于遇到大量土壤的典型路面项目，要确定每种路基土壤的M_r的循环三轴测试可能过于复杂且耗时，无法在生产基础上应用。因此，确定或估算M_r的替代方法是合适的，并且实际上是在1993年AASHTO路面结构设计指南（AASHTO指南1993）中提出的。根据重量下降对标准Proctor标本的影响，开发了一种替代测试方法（ATM）。一个简单的理论模型被用来开发模量和偏应力作为冲击过程中测得的加速度的函数的表达式。进行了分析以比较ATM和人行道下路基的应力状态。建造了一个原型设备，用于估算14个土壤的弹性响应，这些土壤具有标准的循环三轴数据。 ATM结果与标准三轴试验的结果进行了很好的比较，并且ATM能够始终如一地区分出低弹性模量的土壤和高弹性模量的土壤。事实表明，ATM可以提供适合许多设计应用的结果，并且对于减少表征路面项目的M_r响应所需的标准测试数量可能很有用。

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