基于ADINA、ANSYS、FLAC的强度折减法

The strength reduction method based on ADINA,ANSYS and FLAC

与传统极限平衡法相比,强度折减法有众多优势。计算程序和屈服准则是影响强度折减求安全系数的重要因素。以某复杂边坡为例,通过ANSYS-ADINA和ANSYS-FLAC接口程序,建立ADINA、ANSYS、FLAC同套网格模型,克服网格对安全系数的影响。计算中分别选用M-C和D-P准则,分析得出:相对于D-P准则,M-C准则求得的安全系数偏于保守;对于一系列的D-P准则,外角点外接圆D-P和内切圆D-P求得的安全系数分别对应上限和下限;对于同种屈服准则,有限差分法比有限元法求得的安全系数略大。

Compared with the traditional limit equilibrium,the strength reduction method has many advantages. The computational procedures and the yield guidelines are important factors that affecting safety factor through strength reduction. Taking a certain complex slope for an example,through ANSYS-ADINA and ANSYS-FLAC interface program,a mesh model of ADINA,ANSYS and FLAC is established to overcome the grid coefficient on the safety factor. M-C and D-P criteria are respectively selected in the calculation. The following conclusions have been drawn：relative to the D-P criteria,the safety factor is smaller using the M-C criteria; for a series of D-P criteria,the safety factors by the exterior angle point circle D-P and inscribed circle D-P corresponds to the upper and lower limits; for the same kinds of yield criteria,the safety factor is slightly larger with the finite difference method than that with the finite element method.