In order to study the dynamic characteristics and failure law of plastic concrete under three-dimensional stress state,the mix proportion scheme in line with engineering practice was designed,and the strength,stress and strain laws of plastic concrete under different confining pressures and different loading rates were studied by means of dynamic triaxial tester.Finally,the strength criterion based on three parameters was established according to the test results.The results show that the compressive strength of plastic concrete is nearly linearly positively correlated with the loading rate.When the compressive strength of the material is less than 5.0 MPa,it is more sensitive to the low loading rate.When the compressive strength is greater than 5.0 MPa,it is more sensitive to the high loading rate.The stress-strain law of the material under different loading rates is basically the same.When the strain reaches 1.47%～1.90%,the stress peaks and then decreases greatly.Under different confining pressure conditions,the compressive strength of plastic concrete also shows a linear growth trend with the increase of confining pressure.With the increase of confining pressure,the longer the peak stress of plastic concrete is maintained,the better the crack resistance of the material is.Based on the strength criterion formula of Bresler-Pister,the error between the calculated shear stress and the triaxial test is between 1.61%and 4.35%,which basically reflects the deformation and failure law of the material.
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