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研究岩体结构面在循环加载条件下的三维力学性质。通过对二维数值模型合理推广,建立三维本构模型。法向加卸载本构为逐步硬化的双曲线函数。切向模型基于加载为双曲线函数、卸载为线性函数的本构方程建立,并引入剪切方向角描述三维切向接触特性。考虑峰值剪切现象,以切向塑性功为主要参数,建立峰值摩擦角和剪胀角的磨损方程。以初始剪胀角和残余剪胀角为主要参数建立剪胀方程。数值计算结果与试验曲线的对比表明,该模型体现了各向异性结构面的非线性受力变形特性、表面磨损和不均匀剪胀行为,能较好模拟三维循环加载本构关系。
The three-dimensional mechanical properties of rock mass structural plane under cyclic loading are studied. Through the reasonable promotion of two-dimensional numerical model, a three-dimensional constitutive model is established. Normal loading and unloading constitutive model for the gradual hardening of hyperbolic function. The tangential model was established based on a constitutive equation loaded as a hyperbolic function and unloaded as a linear function, and a shear angle was introduced to describe the three-dimensional tangential contact characteristics. Considering the phenomenon of peak shearing, the tangential plastic work is taken as the main parameter to establish the wear equation of peak friction angle and dilatancy angle. The dilatancy equation is established with the initial dilatancy angle and the residual dilatancy angle as the main parameters. Comparing the numerical results with the experimental curves, it is shown that this model shows the nonlinear deformation behavior, the surface wear and the non-uniform dilatancy behavior of the anisotropic structural plane, which can well simulate the three-dimensional cyclic loading of the constitutive relation.