Constitutive Behavior of Fiber Reinforced Sands
Abstract
Conclusions include: 1) The failure surface in a triaxial compression test of randomly distributed, fiber reinforced sand is planar and oriented in the same manner as predicted by the Coulomb theory, viz., (45 + phi/2). This finding suggests an isotropic reinforcing action with no development of preferred of planes weakness or strength. 2) The failure envelopes in our tests were either curved-linear or bilinear with the transition or break occuring at a confining stress denoted as the 'critical confining stress', sigma crit. 3) An increase in fiber aspect ratio, L/D, resulted in a lower sigma crit, and more effective fiber contribution to increase shear strength. 4) An increase in fiber amount or weight fraction, had no effect on sigma crit but it did influence strength significantly. 5) Shear strength increases approximately linearly with increasing amounts of fiber and then approaches an asymptotic upper limit that is governed mainly by confining stress and fiber aspect ratio. 6) Very low modulus fibers (e.g., rubber) contribute little to increased strength in spite of superior pullout resistance (low sigma crit). 7) An increase in soil gradation resulted in lower sigma crit, and higher fiber contribution to strength (all other factors constant). 8) An increase in particle sphericity resulted in a higher sigma crit and lower fiber contribution to strength (all other factors constant). 9) An increase in soil grain size, D50, had no effect on sigma crit; however, it reduced the fiber contribution to strength (all other factors constant). Keywords: Soil stabilization; Earth reinforcement.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 20, 1988
- Accession Number
- ADA200524
Entities
People
- Donald H. Gray
Organizations
- University of Michigan