Abstract: Triaxial tests on the stress-stain relationship and reinforcement effect of glass fiber-reinforced sand were performed. The results show that there are a little effect of the glass fiber on stress-strain relationship at a small strain level (ε1<1%), and stronger effect at the bigger axial strain with the increase of triaxial strain. Under the same confining pressure, the maximum deviator stress becomes bigger and reinforcing effect becomes stronger with the increase of fiber length and quantity. The higher density induces the reinforcing work earlier, the maximum deviator stress goes bigger and reinforcing effect becomes stronger. The bigger the water contents are, the smaller the maximum deviator stress is. The reinforcing works earlier and the maximum deviator stress goes bigger with the increase of the confining pressure, the reinforcing effect goes worse. 

Key words: glass fiber-reinforced sand；triaxial experiment；stress-strain；maximum deviator stress；reinforcing effect