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目前数值流形方法的模拟分析主要是采用线弹性模型,而对于非线性模型分析研究很少。根据数值流形方法的特点和岩土体的本构模型,给出了适用于非线性分析的数值流形方法的计算方法。该方法利用中点增量法进行求解,以改变Duncan-Chang模型中弹性模量的方式来反映非线性,其实质是用分段线性来取代非线性。最后通过算例表明,数值流形方法在岩土体进行非线性分析中是有效的。
At present, the simulation of numerical manifold method mainly adopts the linear elastic model, but few studies on the nonlinear model. According to the characteristics of numerical manifold method and the constitutive model of rock mass, the numerical manifold method suitable for nonlinear analysis is given. This method uses the midpoint incremental method to solve the nonlinear Duncan-Chang model to change the mode of elasticity to reflect the nonlinear, its essence is to use piecewise linear instead of nonlinear. Finally, an example is given to show that the numerical manifold method is effective in the nonlinear analysis of rock and soil mass.