求助：边坡稳定分析计算几步就退出了，未出现滑弧，附...
建了个多土层的边坡稳定分析模型，重力增加法求安全系数，但程序只计算了几步就退出了，查看结果文件，边坡并未出现滑弧，不知什么原因，请高手帮忙看一下。谢谢！*** STIFFNESS MATRIX NOT POSITIVE DEFINITE ***
NODE= 4150 EQUATION= 8245DOF= Y-TRANSLATIONPIVOT= -4.27414311E+06
*** CHECK THE FOLLOWING ***
(A) STRUCTURE COLLAPSE:
- COLLAPSE LOAD OF THE STRUCTURE MAY HAVE BEEN REACHED
(B) LOCAL COLLAPSE:
- ALL MATERIAL POINTS CONTRIBUTING TO A NODE MAY HAVE RUPTURED OR LOST STIFFNESS
(C) ELEMENT DISTORTION:
- ELEMENTS MAY HAVE OVERDISTORTED DUE TO LARGE DISPLACEMENTS OR POOR INITIAL MESH QUALITY
Stiff.matrix not positive definite,wrong boundary conditions or model collapsed
*** ERROR NO. A1002 ***
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