External sewage pipe damaged
This looks like a sewer &quot;cleanout&quot;. This would connect about 4 ft below ground to your sewer line from your house to the city sewer. If you are lucky it is only the top that is damaged, but it could be the thrust damaged it at the bottom. In the latter case you will have a more involved repair.
You could carefully dig out around it, remove the damaged part and look in using a flashlight. Probably you should get a plumber to send TV camera down and get a good look.