Abstract:

Based on triaxial compression tests,this paper researched the stress-strain and strength characteristics of root-soil composite.The ultimate σ₁-σ₃,reinforcement and shear strength index of composite were investigated under the conditions of different root diameter,root arrangement,water content of composite and confining pressure.It was found that the strength incremental ratio of root-soil composite increased with the increasing of root diameter when the water content of composite in the steady state.The strength incremental ratio of horizontal root-soil composite decreased with the increasing of water content,while the strength incremental ratio of vertical and complex root-soil composites increased.Except for the horizontal composite,the vertical and complex root-soil composites obviously improved soil strength.

Key words: triaxial test, root-soil composite, Robinia pseudoacacia, strength