Last week in Tunnelling and Tunnel Boring Machines MAS course was focused on two wide conventional tunnelling fields as Drill and Blast excavation technique and first phase support for rock masses.
Dr. Daniele Martinelli (Rockplan - Politecnico di Torino) introduced the D&B technique, from explosives and detonators to the design of the whole blasting scheme. Another key concept is the management of blasting induced vibrations to avoid disturbances to surface structures. From his wide experience in Baltic hard rocks excavation at Rockplan (Finnish rock structures design company) he presented some practical examples and exercises to reassure the concepts.
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| Dr. Martinelli and Students after his lecture on hard rock excavation examples from Rockplan. |
Stefano Airoldi from Orica explained the technology and field of applicability of the bolts produced by his company, merging the theoretical concepts of each type of bolt with his background from a large career in rock improvement technique. Dr. Martinelli proposed a calculus example for bolting technique and same case studies.
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| Orica bolting technology presented by Stefano Airoldi. |
Dal Negro Enrico from Mapei (Construction Equipment Supplier) held a fantastic lecture focused on sprayed concrete for first phase lining applications both for temporary and permanent solutions. He presented dry and wet mixtures technologies focusing mainly in the latter as it is the one applied in almost 95% of the cases.
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| Sprayed concrete technology presented by Mapei UTT leader Dal Negro Enrico. |
Two experts from Bekaert Maccaferri (De Rivaz, Benoit and Rossi, Bruno) gave an outstanding presentation on the use of fibre reinforced concrete technology for tunnelling applications. Cast in-situ final lining, Precast concrete segments and last but not least Sprayed concrete are the main field of applicability for this innovative solution that provide fantastic performance, faster and safer working conditions than conventional steel reinforced concrete.
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| De Rivaz, Rossi and students after the lecture on fibre reinforcement for tunnelling applications. |
Finally Dr. Martinelli presented the concept of grouting for rock masses combined with several practical examples from his own experience at Rockplan company. Some time was given also to a case study of the approach taken by the company to some very interesting projects as metro tunnels and a nuclear repository in Finland.
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| Rockplan rock structures design case studies presented by Dr. Martinelli. |
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