Under Various Stress The Constitutive Relation And Failure Criterion Of Reactive Powder Concrete

Reactive Powder Concrete(called "RPC" for short) which exhibits properties such as ultrahigh strength, high ductibility and high ductibility has applied to the fields of tunnel, underground engineering and water project, etc. In this paper, the constitutive relation considered stochastic damage was established based on the results of the uniaxial tension-compress test and biaxial tension-compress test. The triaxial compress tests of RPC under different peripheral pressure were carried out and the failure criterions under each stress conditions were studied. The main finished work is as follows:1, Studied the microscopic model of the RPC at the state of uniaxial tension based on the uniaxial tension test and deduced the damage evolution equation of RPC. Predicted the axial tension stress-strain curve of RPC according to the parameters of the damage evolution equation. Studied the uniaxial compression test according to the existing uniaxial tension test and predicted the axial compression stress-strain curve of RPC. Then, draw the uniaxial compressive damage curve of RPC according to the damage model.2, Extended constitutive relation of uniaxial compress to biaxial compress in order to obtain the failure criterion of RPC at the state of biaxial compress, and compared it with the result of test. Studied the biaxial strength and deformation characteristics and the biaxial constitutive model of RPC to obtain the corresponding conclusion.3, Obtained the triaxial failure modes of RPC under the confining pressures of OMPa,20MPa,25MPa,40MPa,45MPa,60MPa and 65MPa through the study of triaxial test of RPC. Analysed the failure modes of RPC and obtained the failure criterion of RPC under triaxial compress.