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Expansion Joint in Tunnel

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Dear Sefiant,


We are having 50m long tunnel connected between two buildings at raft foundation level. Building sizes are approximately 50m x 50m and building has one basement hence tunnel is connected between basements and entirely buried in soil.   And water table is 3m above bottom of tunnel as per geotechnical report.   We are not providing any Expansion Joint, is it acceptable or not?


Also We are having underground car parking structure approximately 500m long, 60m wide and top of roof slab is 1.5m below ground level. We have not provided any expansion joint in raft but expansion joint is provided every 50m c/c above raft.  Request you to comment on the proposal whether it is ok or not?


Can anybody having the design experiences share some knowledge?


Thanks in advance.






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