Hi everyone!
There are some methods for selecting a proper TBM based on the geological conditions. These methods are proposed by RMR, QTBM, and etc. Is there any method for selecting the best TBM according to the tunnel situation that use all parameters such as strength parameters, water level, changing during the length of tunnel, depth, cost, and etc and for every parameters is presented a number for every TBM types? For example, a system like RMR that it is considered many parameters and finally suggest a tunnel supporting system based on the RMR number.
Thanks in advance for sharing your experience
This is not a straight forward answer, and is dependent on several uncertainty in addition to the local geology present at the site.
The ITA has released a few publication with regards to the above, it might be a good start point for your question.
Regards,
Aly
https://www.ita-aites.org/media/k2/attachments/public/Recommendations_ITA_TBM.pdf
https://www.ita-aites.org/en/how-to-go-undergound/construction-methods/mechanized-tunnelling
http://www.acquacon.com.br/2cbt/apresentacoes/2506/16h30larsbabendererde.pdf
I am also of the opinion that there is no set rule for the choice of TBM, as the factors to be considered are several and may go beyond the (prevailing) rock classification. For example (i) one may wish to use a balanced pressure TBM when tunneling in urban areas to prevent damage to buildings. (ii) whether the tunnel is lined or unlined, (iii) Time for construction may be another factor,, etc.
I agree with Eugenio. There is a los of not geological factors influencing the election. I can add tunnel longitude, possible utility of excavated rock, power supply, waste disposal possibilities and problems,....
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