A TBM advances by thrusting against the built segments through an array of cylinders around the circumference. This thrust is a design...

Tunnel is a place where size matters. As a tunnel gets bigger in diameter comes a raft of challenges, some construction related, some...

In this previous post , the advantages of using high-density slurry in TBM operation has been explain. Then why aren’t all slurry TBM...

This blogpost shares a few tips about modelling from personal experience

What is slurry used in TBM tunnelling? The slurry used in TBM tunnelling is basically a water-based suspension fluid with added solids...

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...

Explaining the observational method in plain and understandable language

Creep, stress relaxation and shrinkage are different concepts but easily confused

Once the TBM gets started, it usually stops from time to time for a procedure called ‘face intervention’

For tunnelling operations in self-standing ground, three arch-types of TBMs can be used: open, single shield and double shield

Annulus grouting (also called back grouting or tail-skin grouting) is the grouting around the tunnel annulus – the backfilling of the gap...

Peat is generally considered as highly problematic and one of the least wanted soil types you want your foundation to be in. It is an...

main consideration factors around the segment thickness, radial length and longitudinal length

pros and cons between EPB TBMs and slurry TBMs under specific scenarios of consideration

This blog post explains the ‘reverse’, ‘sideways’ and ‘inclined’ bearing capacity problems.

Ground water is a matter unique to geotechnical engineers

This blog will complete this series by discussing some practical uses of the Convergence-Confinement theory

the in-situ stress of the ground will be shared between the ground itself and the supporting structure once the tunnel is done

What convergence and what confinement? Convergence-Confinement is a well-known theory in tunnelling, and widely applicable regardless of...

soil acts as a sponge, in that it pushes out water when squeezed, and sucks in water when let go