黏土心墙堆石坝张拉裂缝的双阶段判别准则与损伤演化特性OA

The hyperbolic function and the Mohr-Coulomb strength line were adopted as the strength criteria for the tensile and shear failure sections of clay materials,respectively.A hyperbolic-Mohr combined strength tensile cracking criterion was thus developed,which provides a new theoretical basis for identifying tensile cracks in clay core walls.The evolution characteristics of the tensile fracture zone of the clay core wall before and after cracking were analyzed.The Duncan E-B model was extended to the stress-strain analysis of the clay tensile stage,and a clay tensile extension Duncan E-B model was constructed,which characterizes the stress-strain law of the tensile zone of the clay core wall before cracking.Meanwhile,a statistical damage model for the tensile stage of the clay core wall was proposed by integrating statistics and continuous damage mechanics,describing the stress-strain relationship during the softening stage after cracking in the tensile zone of the clay core wall.Finally,the reliability and superiority of the proposed method are verified based on three practical projects.The proposed method provides a scientific basis for similar projects to prevent the genera-tion and development of tensile cracks.