TRIAXIAL TEST STUDY ON REINFORCED CALCAREOUS SAND

In order to study the mechanical properties of reinforced calcareous sand,a series of large-scale triaxial consolidation drainage tests were performed on reinforced and unreinforced calcareous sand. The testing variables included confining pressures,types of reinforcing materials and number of reinforcement layers. The study methods were as follows: First,the stress-strain relationships,volume strain-axial strain relationships and grain-size distribution curves after the tests of calcareous sand specimens were obtained by the consolidated-drained triaxial compression tests and sieve analyses. Second,the influences of reinforcement on the strength,deformation and particle breakage of calcareous sand were analyzed by these test results. Finally,the rule of particles breakage was obtained by correlating the particle breakage with the input energy. The study results indicated that the strength of reinforced calcareous sand is much higher than unreinforced calcareous sand,and the reinforcement effect increases with the number of reinforcement layers and the 2% elongation secant stiffness of the reinforcement material,but decreases with confining pressure. The reinforced materials can also effectively inhibit the dilatancy of calcareous sand,and the more the number of reinforcement layers,the more obvious the inhibitory effect. In addition,the relationship between particle breakage and input energy is unique regardless of the reinforcement conditions,and the degree of particle breakage increased with the input energy.