Mohr-Coulomb Failure Criterion of Ultra-high Performance Concrete is Based on the Shear Strength Parameters
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摘要: 通过对4种钢纤维体积含量（0%、1%、2%和3%）的超高性能混凝土在5档围压（0、10、20、40和60 MPa）下进行常规三轴压缩试验，基于直线型摩尔强度包络线及试验数据推导出每种钢纤维含量超高性能混凝土在不同围压下内摩擦角φ和黏聚力c，由c值和φ值计算确定Mohr-Coulomb破坏准则中的参数，得到不同围压不同钢纤维含量下的MohrCoulomb破坏准则，经检验这种随围压与钢纤维含量不同而变参数值的Mohr-Coulomb破坏准则能较好的描述超高性能混凝土三轴抗压强度的发展规律。Abstract: Through the conventional triaxial compression experiment of ultra-high performance concrete with 4 kinds of steel fiber volume contents（0%,1%,2% and 3%）at 5 grades confining pressures（0,10,20,40 and 60 MPa）, The specific values of internal friction angle φ and adhesion c in different confining pressure of each steel fiber content ultra-high performance concrete are deduced from the test data, the parameter in the Mohr-Coulomb failure criterion is determined by the c and φ values, and the specific expression of Mohr-Coulomb failure criterion under different confining pressures and different steel fiber contents are obtained too. It is found that the Mohr-Coulomb failure criterion can better describe the development law of the triaxial compressive strength of ultra-high performance concrete.
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