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earth dam design, problem in last step

earth dam design, problem in last step

earth dam design, problem in last step

(OP)
hi
I am working modelling an earth dam, with a sequence of construction, but i have a problem in the last step, it say "FIXED TIME INCREMENT IS TOO LARGE". I had changed a lot of times the time increment, but it don't work, then i use a adaptive mesh, but it can be used with certain elements..i don't know that else can i do...please help me..attachment is the .inp file with my model...i hope you run it and can help me to solve the problem...thanks

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