Three-dimensionalStrengthCharacteristicofRockfill

考虑颗粒尺寸效应、破碎、分形等细观特征,结合大尺寸三轴试验结果,建立了堆石料的各向异性破坏准则。借助砂土细观组构描述方法,用组构张量描述堆石料颗粒细观特性,提出了新的各向异性状态变量;同时将该变量作为堆石料细微观演化的内变量建立了线性形式的堆石料破坏准则,构建过程既简化了表达式,又保留了现有指数形式破坏准则的优点,能够描述复杂应力条件下堆石料的强度特性。通过状态变量的变化,提出的准则能较好地描述不同各向异性条件下应力状态、路径、罗德角、主应力轴旋转等变化对堆石料强度的影响。

Considering mesoscopic characteristics such as particle size effect, breakage and fractal, an anisotropic failure criterion for rockfill materials was established combined with the results of large-scale triaxial tests. By adopting the mesoscopic fabric description method for sandy soils, the mesoscopic properties of rockfill particles were described using fabric tensors, and a new anisotropic state variable was proposed. Meanwhile, taking this variable as an internal variable describing the meso-microscopic evolution of rockfill materials, a linear failure criterion for rockfill materials was established. The formulation process not only simplifies the expression but also retains the advantages of existing exponential failure criteria, and can describe the strength characteristics of rockfill materials under complex stress conditions. By varying the state variable, the proposed criterion can well describe the effects of changes in stress state, stress path, Lode angle, principal stress axis rotation and other influencing factors on the strength of rockfill materials under different anisotropic conditions.