The stress-dilatancy relationship could guide and form the basis for the development of a constitutive model for polypropylene fiber-reinforced soils. Fiber reinforcement presents a promising alternative in the projects involving either localized repair of slopes or reinforcement of thin soil veneers, especially when the planar reinforcement (e.g., with geotextiles and geogrids) is difficult to implement. However, the existing stress-dilatancy theory has not been evaluated for discrete fiber reinforced soils. In this study, a number of triaxial compression tests were carried out to investigate the effectiveness of randomly distributed fiber reinforcements on the stress dilatancy of Nanjing sand. A new parameter representing the increase in the effective confining stress was introduced to describe the stress-dilatancy of fiber-reinforced sand. To consider the fiber reinforcement, a new stress-dilatancy relationship was proposed for fiber reinforced sand based on Rowe’s stress-dilatancy for granular materials. The stress-dilatancy relationship is validated against a series of triaxial tests on Nanjing sand and Hostun RF sand mixed with discrete polypropylene fibers.
Stress dilatancy Fiber reinforcement Sand
This is a preview of subscription content, log in to check access.
The authors would like to acknowledge the supports provided by the National Natural Science Foundation of China (Grant No. 11402109) and the Natural Science Foundation of Jiangsu Province (Grant No. BK20130909).