Techical data from TTi

Rock cavern design on the West Island Line

Thu, 19 Apr 2012 00:00:00 GMT

In 2011 two new underground stations on the West Island Line were under construction beneath dense urban areas. Only one MTR station rock cavern, Taikoo, had been constructed before, and in a much less challenging area. This paper by Eric...

Getting to the core of the matter

Thu, 19 Apr 2012 00:00:00 GMT

Since there still seems to be a marked reluctance in many quarters to spend much on site investigative work before main tunnel construction commences, it is fortunate that drilling, probing, sampling and testing methods are gradually becoming...

TBMs in squeezing ground conditions

Wed, 18 Apr 2012 00:00:00 GMT

In Part I of their contribution, Marco Ramoni of Basler & Hofmann and Georgios Anagnostou of ETH Zurich described the specific problems of and discussed possible countermeasures for dealing with squeezing ground during TBM tunnelling. Part...

Primary risk reduction

Wed, 18 Apr 2012 00:00:00 GMT

It is notable that many treatises on the subject of project risk management do not pay much attention to the subject of site investigation (SI), even though the gathering of accurate information before a tunneling project commences is bound...