Pipes used in drainage works are normally of spigot and socket type which is flexibly jointed. For this kind of pipe connections, it allows small amount of rotation and hence it could withstand certain degree of uneven ground settlement.
Owing to uncertain nature of settlement in reclamation area where differential settlement is anticipated to occur, coupling system is usually provided for drains installed in reclamation area which provides a higher degree of resistance to differential settlement. Otherwise, it may cause cracking of pipelines leading to washing in of soil inside the pipelines. In the worst scenario, significant loss of soil may result in ground subsidence.
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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.
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