Well, tunneling induced settlements because stresses decreased, but needs to know the environment. There is not enough research on this matter!! Hope this helps you!!

yea there is not enough research about the stress case during excavating tunnels. thanks for answer

yes, geotechnical engineer is normally looking for investigating changes in stresses and strain conditions in the ground due to tunneling. Usually, the tunnel wall is subjected to tension and the tension strain in around the tunnels are to be obtained to investigate the stability of the ground...

thanks for this useful answer

Generally the settlement increases when you are relieving the stress however the actual values depends on the founding medium.

thanks for answering me