论文部分内容阅读
为克服基于Hoek-Brown强度准则的屈服面数值奇异问题,提出新的棱角处屈服面圆化方法,在此基础上,借助ABAQUS二次开发平台,采用FORTRAN语言编制理想弹塑性模型子程序,应力更新算法为完全隐式的向后欧拉积分算法;提出基于Hoek-Brown准则的有限元强度折减技术,并将其嵌入到圆化后的屈服函数中,探讨了强度折减技术应用于Mohr-Coulomb强度准则和Hoek-Brown非线性强度准则的异同点。对某圆形隧洞的模拟分析表明,围岩应力和塑性区的数值计算结果和解析结果吻合很好;对某岩质边坡的模拟分析表明,与等效Mohr-Coulomb模型的线性强度折减技术相比,基于Hoek-Brown模型的非线性强度折减技术获得的潜在滑动面位置较浅、形状较陡,更符合岩质边坡滑动面的特征,两个算例验证了该圆化方法和非线性强度折减技术的正确性和适用性。
In order to overcome the singularity problem of the yield surface based on the Hoek-Brown strength criterion, a new corner rounding method based on the Hoek-Brown strength criterion is proposed. Based on the ABAQUS secondary development platform, the FORTRAN language is used to prepare the ideal elastoplastic model subroutine. The stress The update algorithm is a completely implicit backward Euler integral algorithm. A Hoek-Brown-based finite element strength reduction technique is proposed and embedded in the rounded yield function. The application of the intensity reduction technique to Mohr Similarities and Differences between the Coulomb Intensity Criterion and the Hoek-Brown Nonlinear Intensity Criterion. The simulation analysis of a circular tunnel shows that the numerical calculation results of the surrounding rock stress and plastic zone are in good agreement with the analytical results. The simulation analysis of a rock slope shows that the linear strength reduction of the equivalent Mohr-Coulomb model Compared with the technique, the potential sliding surface obtained by the nonlinear strength reduction technique based on Hoek-Brown model is shallow and steeper in shape, which is more in line with the characteristics of the sliding surface of the rock slope. Two examples show that the rounding method And the correctness and applicability of nonlinear strength reduction techniques.