Abstract
As part of an ongoing study on subgrade failure from accelerated pavement testing, vertical, longitudinal, and transverse stresses and strains were measured in the base course as a function of load repetitions. Both the dynamic and permanent vertical strains in the upper layer of the base course were about twice the strain in the lower part of the base. In summary, the vertical permanent strains were compressive, while the longitudinal and transverse strains were extensional in the base course. The total vertical deformation of the base was about 50% of the combined base and subgrade deformation. The permanent transverse and longitudinal strains in the middle of the base course were equal. The vertical stress in the middle of the base showed a slight increase with increasing load repetitions. Transverse stresses in the middle of the base remained constant. For the covering abstract see ITRD E118503.
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