【摘要】 为探究复杂应力状态下混凝土变形破坏过程中的能量演化规律、揭示混凝土变形破坏的本质特征，利用静动力三轴仪进行不同应变速率(10^-5、10^-4、10^-3、10^-2/s)与不同侧向围压下（4.5、6.0、9.0、12.0 MPa）的混凝土三轴动态力学试验，研究了动态三轴压缩下混凝土的总能量密度、弹性应变能密度和耗散能密度随轴向应变的演化规律，进一步分析了应变速率和侧向围压对混凝土能量演化规律的影响。结果表明，随轴向变形的增加，混凝土的总能量密度和耗散能密度呈非线性增加，弹性应变能密度先增大后减小。应变速率和侧向围压的增大均提高了混凝土的单位储能极限，且混凝土的储能极限表现出较强的速率敏感性；储能极限与侧向围压近似呈线性关系；随侧向围压的增大，混凝土储能极限的速率敏感性呈降低趋势。更多还原

【Abstract】 A static dynamic triaxial instrument was used to carry out concrete triaxial dynamic mechanical tests by setting different strain rates(10^-5/s, 10^-4/s, 10^-3/s, 10^-2/s) and different lateral confining pressures（4.5 MPa, 6.0 MPa, 9.0 MPa and 12 MPa）. The evolution law of the total energy density, elastic strain energy density and dissipated energy density of concrete with axial strain under dynamic triaxial compression was studied. The influence of lateral confining pressure and strain rate on the energy evolution law of concrete was analyzed. The results show that with the increase of axial deformation, the total energy density and dissipated energy density of concrete increase nonlinearly, and the elastic strain energy density first increases and then decreases. The increase of strain rate and lateral confining pressure improves the specific energy storage limit of concrete, and the energy storage limit of concrete shows a strong rate sensitivity; The relationship of energy storage limit and the lateral confining pressure is approximately linear; With increase of the lateral confining pressure, the rate sensitivity of the concrete energy storage limit shows a decreasing trend.更多还原