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Implementing an Analytical Framework to Quantify the Magnitude and Rate of Subgrade Pumping in Flexible Pavement

机译：实施分析框架，以量化柔性路面中路基泵浦的幅度和速率

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摘要

Particle transport in porous media can significantly compromise the serviceability of civil infrastructure. For example, pumping or migration of saturated subgrade soil to pavement subbase, adversely affects the performance of the pavement and leads to its failure. In this study, an analytical framework is implemented to 1) understand mechanisms of pumping, and 2) estimate the amount of subgrade fines migration into subbase under traffic loads. The model is verified using results obtained from experimental investigations previously conducted to quantify the amount of pumping. The experimental tests were conducted using one-third model mobile load simulator (MMLS3), an accelerated pavement testing (APT) device. Results showed that the analytical model provided a reasonable prediction of the amount of fines migration from a saturated pavement subgrade to subbase. The study also revealed that the subgrade pumping and the deposition process is governed by hydraulic condition, erodibility of subgrade, grain size of subgrade, grain size and pore size of subbase, permeability of subbase, and viscosity of pore fluid in the subbase.
机译：多孔介质中的颗粒运输可以显着损害民事基础设施的可维护性。例如，饱和路基土壤的泵送或迁移到路面子基础，不利地影响路面的性能并导致其失效。在本研究中，分析框架实现了1）理解泵送机制，2）估计交通负荷下迁移到子基底的路基罚款量。使用从先前进行的实验研究获得的结果来验证该模型以量化泵送量。使用三分之一模型移动负载模拟器（MMLS3）进行实验测试，加速路面测试（APT）设备。结果表明，分析模型提供了对从饱和路面路基到亚巴基质迁移的罚款量的合理预测。该研究还透露，路基泵送和沉积过程受液压条件，路基，晶粒尺寸的腐蚀，粒径，粒径和孔径的粒径，子比例的渗透率，以及子比例中的孔流体的粘度。

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