Hello, I am working on the load reduction method for the simulation of the tunnel excavation, where the internal pressure (p0) in the opening equals the external earth pressure (as in the figure). Before the shotcrete shell is included, this internal pressure is reduced by a b-factor (between 0 and 1; 0 = full internal pressure; 1 = no internal pressure) in the further steps. Here, the excavation is simulated in plane strain.

The way I am doing it is by 2 jobs. In the first job, the reaction forces are calculated and printed at each node, then in job 2; reaction forces are imported with reduced b-factors to the same nodes.

I would like to know how it is possible to automate it in one job instead of doing two jobs.

I would appreciate any help,

Thank you

Abaqus ​​​​​​​