Are there means in the MMCD contract to deal with Force Majeure?

There is no "Force Majeure" as such within the standard GCs or in the supplementals.

Force Majeure GC 13.4.1
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Is a Change Order required for Force Account?

Note that the Contract Administrator is the interpreter of the Contract Documents, and the judge both parties to the Contract (GC 3.6.1). Refer to General Conditions regarding Extra Work and Change Orders.