基于ANSYS的强度折减法强度准则转换关系

Conversion Relationships of Strength Reduction Methods Based on ANSYS

探讨了基于ANSYS的有限元强度折减法强度准则的选取问题,推导出德鲁克-普拉格准则不同形式的安全系数的转换关系。通过算例,验证了转换关系的正确性。发现基于ANSYS的内置外角点外接圆准则计算的安全系数偏大、偏危险。对于二维边坡问题,可将其转换成平面应变圆准则下的安全系数(非关联流动法则)或内切圆准则下的安全系数(关联流动法则);对于三维边坡问题,可转换成内角点内接圆准则下的安全系数。

The selection problem of strength criterions of FEM strength reduction method based on ANSYS is discussed, and the conversions of safety coefficient of different Drucker- Prager criterionforms were derived. Through many examples, the correctness ot the conversion relationship is venlied. The results show that the calculation of safety factor of external angle ＆ circumcircle criterion built-inANSYS is larger and more dangerous. For the problem of two-dimensional slope, Its safety factor calculated by ANSYS can be converted to the safety factor of plane strain circle criterion （non-associated flow rule） or inscribed circle criterion （associated flow rule）. The 3D slope stability problem can be converted into the safety factor of the corner points and inscribed circle criterion.