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The Si-Eng
Si's civil engineering blog
All original by Si Shen.
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TBM operation and surface settlement
We all know that the amount of surface settlement that a TBM generates depends on the ground and groundwater properties. In addition, it...
Si Shen
Mar 312 min read
220 views
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TBM thrust estimation
A TBM advances by thrusting against the built segments through an array of cylinders around the circumference. This thrust is a design...
Si Shen
Mar 42 min read
141 views
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Scale factors of large diameter TBM-built tunnels
Tunnel is a place where size matters. As a tunnel gets bigger in diameter comes a raft of challenges, some construction related, some...
Si Shen
Jan 253 min read
241 views
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High-density slurry muck transportation for TBM
In this previous post , the advantages of using high-density slurry in TBM operation has been explain. Then why aren’t all slurry TBM...
Si Shen
Jan 81 min read
51 views
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Tips for complex analytical modelling in civil engineering
This blogpost shares a few tips about modelling from personal experience
Si Shen
Jul 13, 20243 min read
235 views
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Properties of slurry for TBM tunnelling
What is slurry used in TBM tunnelling? The slurry used in TBM tunnelling is basically a water-based suspension fluid with added solids...
Si Shen
Jun 29, 20242 min read
232 views
1 comment


How high density slurry help mitigate tunnelling risks
Why slurry can support tunnel face? The reason why slurry can be used as an effective medium of face support, is because of the ‘filter...
Si Shen
May 25, 20242 min read
142 views
0 comments


TBM face intervention
Once the TBM gets started, it usually stops from time to time for a procedure called ‘face intervention’
Si Shen
Feb 28, 20232 min read
564 views
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TBM selection in rock conditions
For tunnelling operations in self-standing ground, three arch-types of TBMs can be used: open, single shield and double shield
Si Shen
Jan 6, 20234 min read
526 views
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Annulus grouting behind tunnel segments
Annulus grouting (also called back grouting or tail-skin grouting) is the grouting around the tunnel annulus – the backfilling of the gap...
Si Shen
Aug 7, 20222 min read
748 views
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Tunnel segment geometry (1)
main consideration factors around the segment thickness, radial length and longitudinal length
Si Shen
May 15, 20222 min read
506 views
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TBM selection under specific scenarios
pros and cons between EPB TBMs and slurry TBMs under specific scenarios of consideration
Si Shen
Apr 12, 20222 min read
230 views
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Convergence confinement method (3)
This blog will complete this series by discussing some practical uses of the Convergence-Confinement theory
Si Shen
Jan 31, 20223 min read
242 views
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Convergence confinement method (2)
the in-situ stress of the ground will be shared between the ground itself and the supporting structure once the tunnel is done
Si Shen
Jan 12, 20222 min read
268 views
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Convergence confinement method (1)
What convergence and what confinement? Convergence-Confinement is a well-known theory in tunnelling, and widely applicable regardless of...
Si Shen
Jan 3, 20223 min read
687 views
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TBM selection - EPB and Slurry
Selecting the ‘right’ TBM is all about maximising efficiency and minimising risk
Si Shen
Oct 25, 20214 min read
4,190 views
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Instrumentation and monitoring - an overview
Instrumentation and monitoring is an essential link of risk management in the cycle of design and construction
Si Shen
Aug 9, 20214 min read
213 views
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Ground water in underground construction
groundwater is a thorny problem for almost all underground constructions
Si Shen
Jun 7, 20213 min read
395 views
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Sprayed concrete – what’s special about it?
This post is a study note based on various sources rather than professional advice, and may not be reflective of the most up-to-date...
Si Shen
May 2, 20214 min read
88 views
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Top 5 unique challenges of designing underground structures
In the underground world, being apparently accurate in the calculation process is usually meaningless.
Si Shen
Mar 9, 20213 min read
142 views
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