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首页> 外文会议>GeoShanghai International Conference; 20060606-08; Shanghai(CN) >An Alternative Test for the Resilient Modulus of Fine Grained Subgrades
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An Alternative Test for the Resilient Modulus of Fine Grained Subgrades

机译：细粒路基弹性模量的替代测试

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摘要

For mechanistic design of pavement systems based on elastic theory, the resilient modulus is used to characterize the soil subgrade. The standard procedure for obtaining resilient modulus is a repeated load triaxial test under a range of stress states. This test is complicated and expensive, and as a result many commercial laboratories will not conduct these tests but instead rely on empirical relationships. An alternative test method was developed in which a hammer of known mass falls onto a volume of soil, and the acceleration response of the falling weight used to calculate the modulus. While this approach has been used by others, the device described here is new and tests fine-grained soil in an unconfined state. The alternative test method was used on 4 different soils and the results compared with results obtained from the standard repeated load test. The alternative test produced reasonably consistent results and appears to measure a material response that correlates well with the standard triaxial resilient modulus test results. The device was also used to demonstrate the decrease in modulus with increasing water content. It is suggested that the alternative test for resilient modulus may be a cost-effective approximation for mechanistic pavement design for projects where the complete standard test is not warranted.
机译：对于基于弹性理论的路面系统的机械设计，弹性模量用于表征土基。获得弹性模量的标准程序是在一定应力状态下进行重复载荷三轴试验。该测试是复杂且昂贵的，因此许多商业实验室将不会进行这些测试，而是依靠经验关系。已开发出另一种测试方法，其中将质量已知的锤子落在一定体积的土壤上，然后使用落锤的加速度响应来计算模量。尽管此方法已被其他人使用，但此处描述的设备是新设备，可以在无约束状态下测试细粒土壤。在4种不同的土壤上使用了替代测试方法，并将结果与​​标准重复载荷测试的结果进行了比较。替代测试产生了合理一致的结果，并且似乎测量出与标准三轴弹性模量测试结果非常相关的材料响应。该装置还用于证明随着水含量的增加模量降低。建议对弹性模量的替代测试可能是机械路面设计的经济有效的近似方法，适用于不需要完整标准测试的项目。

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