Good read.

The effect of altering the slurry circulation system on TBM tunnelling in weathered Kowloon granite

J.N.Shirlaw (a) T.O.Henderson (a) I.S.Haryono (a) F.Dudouit (b) D.Salisbury (c)
a    WSP-Golder, Hong Kong SAR, People’s Republic of China
b    Vinci Construction Grands Projets, New Zealand
c    Formerly MTR Corporation Ltd., Hong Kong, People’s Republic of China

Received 30 July 2021, Revised 15 February 2022, Accepted 7 March 2022,
Available online 13 March 2022, Version of Record 13 March 2022.

https://www.sciencedirect.com/science/article/abs/pii/S0886779822001146