Hello Saurabh,
A thrust block is usually a large block of concrete placed where the vertical pipe near the A/G -U/G interface bends to run horizontal underground (essentially an anchor point).
The unknown question is how is your piping connected to the trust block: to slide on top of the block, to slide on the vertical face of the block, or rigidly connected to the block. Add additional supports to the piping to correctly model the piping connection or restricted movement relative to the thrust block.
Regards,
Mike Dattilio
Bentley Technical Support Analyst
Web: selectservices.bentley.com
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