碾压混凝土力学特性及本构模型研究

为了解岷江流域某高拱坝坝体碾压混凝土的力学特性，对取自该坝体的碾压混凝土试样，进行了常规三轴压缩和直接剪切全过程试验。根据试验资料，对碾压混凝土在常规三轴压缩和直接剪切作用下的变形、强度、破裂特性及其本构特性进行了详细分析。结果显示，碾压混凝土在三轴压缩下的切线模量较大，而抗压强度相对较小；三轴压缩下的抗剪强度参数与直接剪切下的抗剪强度参数的差值较小。

Mechanical Properties of Roller Compacted Concrete

To investigate the mechanical properties of the roller compacted concrete (RCC) of a high arch dam in Minjiang river catchment, the RCC samples drilled out of the dam were tested under routine triaxial pressure and direct shearing loads. According to the test data, the properties of deformation, strength and fracture of the RCC under routine triaxial pressure and direct shearing load were analyzed in detail, and the constitutive equation of RCC was derived. The results show that the tangent modulus of elasticity of the RCC under triaxial pressure is comparatively high and the compressive strength is relatively low. There is a large difference between the shear strength of RCC under routine triaxial pressure and that under direct shearing load.