Definitely , An expansion joint is needed where the conduit comes up out of the ground to a meter box , LB fitting etc . At my mom's condo , I was doing some work in the back yard and found the pvc conduit had busted at the meter box leaving a 1 1/2" gap , Luckily , The place was still under warranty and I showed it to her , She called the builder to fix it and still , They didn't install an expansion joint and will end up breaking again , With the gap it left , I'm surprised it didn't pull the meter box off the wall , Especially outside , You need an expansion joint on all runs of pvc conduit or this case scenario will happen to you
The joint is needed when the PVC extends from underground to attach to a point above ground. It allows the movement. If you are concerned with the expanding of the pipe, consider installing PVC coupling.
Article 352.44 Expansion fitting for RNC shall be provided to compensate for thermal expansion and contraction where the length change in accordance with table 352.44 (A) or table 352.44 (B) is expected to be 1/4 or greater in straight run between securely mounted item such as boxes ,cabinets , elbow or other conduit termination. So looks like you are doing some thing big look it up on the code book.