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Contact problem?

Contact problem?

Contact problem?

(OP)
I created 2 blocks of soil and embeded Geogrid in the middle.  I created interface between bottom soil/geogrid and top soil/geogrid using tangential option and frictionless.  But I got the warning saying

Solver problem. Numerical singularity when processing D.O.F.  1 of 1 nodes. The nodes have been identified in node set warnnodesolvprobnumsing_1_1_1_1_1.

the matrix has 1 negative eigenvalue.

It ran for like 1% of strain and it stopped.  I also noticed that the geogrid embeded in the middle was sticking out after apply displacement on the top surface.  I was wondering if anyone could help me with this matter to make it run correctly?  The boundary condition of the whole mesh is that I put hinge on the corner left bottom and roller on the bottom surface.  By the way this is for 2d-plainstrain.  The geogrid i used it as a truss for the option material.

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