三剪统一弹塑性本构模型及ANSYS二次开发

The triple-shear unified elasto-plastic constitutive model and its secondary development to ANSYS

针对传统方法在求解岩土工程问题中,只能得出理论解的不足。基于三剪统一屈服准则,推导了三剪统一弹塑性本构关系并编写了相应的ANSYS二次开发子程序,以用于实际工程。通过对静水压力下圆形隧洞进行应力数值计算,结果表明所得数值解与解析解相吻合,从而证明了模型推导及二次开发编程的正确性,并将该程序用于实际边坡稳定的计算中,得出了该边坡问题的数值解。算例表明:中间主应力系数增大,滑体稳定系数也增大,但变幅不大。

The traditional method for solving geotechnical engineering problems can only obtain to the theoretical resolutions. The triple-shear unified elasto-plastic constitutive model was proposed based on the triple-shear unified yield criterion,and the secondary development for ANSYS with the complicated practical engineering problems.The coincidence between the theoretical resolutions and the numerical resolutions for circular tunnels under the static pressure indicated that the proposed constitutive model and the subroutine codes were convincible. As an example,the slope stability was analyzed with the developed ANSYS software and came to the numerical resolutions. The results showed the stability of landslide increases with the increasing of the intermediate principal stress.