LINING | SEGMENTAL


ALPINE FOCUS


Brenner Base Tunnel had recent segment production milestones. This type of lining is focus of workshop in the upcoming Geomechanics Congress in Salzburg


Salzburg will see a special focus on segmental and other tunnel linings in one of the three major workshop sessions preceding this year’s Geomechanics Congress, before the main activities of the 74th Geomechanics Colloquium, both organised by the Austrian Society for Geomechanics (OGG).


WORKSHOPS: 8 OCT Three workshops are planned to be held concurrently on 8 October for the 2025 Geotechnical Congress. The workshops are: ● Segmental Lining (a full day, looking at fundamentals; guidelines and fibre reinforcement; and, accessories, sealing and backfill);


● Sustainability in Infrastructure Construction: a full day, in four parts, covering different aspects of planning and construction (though exclusively in German); discussing circular economy, carbon emissions, reliability, standardisation, research, equipment, materials, and transport; and,


● Generating Knowledge from Data: a half day (afternoon), discussing how digital tools work together to plan for and gather data to achieve useful intelligence able to practical support decision- making for project planning, documentation and site management; real-world examples are to be discussed (instrumentation, grouting, water management, drilling, data management), and common pitfalls.


WORKSHOP: SEGMENTAL LINING The full day workshop session on tunnel segmental lining is arranged in four parts, covering: Fundamentals of Segments; Accessories, Sealing and Backfill; Guideline and fibre Segments; and, Use of Fibre Segments.


Fundamentals of Segments: With presentations being given by a consultant, a contractor and an equipment manufacturer, the lectures in the first section are to focus on design fundamentals of segmental lining, production casting, and formwork moulds, respectively.


Accessories, Sealing and Backfill: Exactly as the section title suggests, these areas are to be covered by different manufacturers.


Fibre Reinforced Segments: The entire afternoon of the workshop is being given over to fibre reinforcement of tunnel lining segments. There are to be two sections - including five lectures in total


38 | September 2025


plus a discussion to round off the focus on fibres, but also the workshop.


The first of the two sections in the afternoon will consider the new Austrian Segment Guideline, steel fibres, and test results. The second section has invited views on fibre reinforce concrete segments (FRCS) to be shared by a design consultant and a contractor, respectively. A very interesting workshop, indeed.


COLLOQUIUM: 9-10 OCT The main lectures of the 2025 Geomechanics Colloquium will be held over 9-10 October, with a full day on the former and a half day on the latter.


Colloquium: 9 Oct On the full, first day on the main Colloquium event, the lectures will be under two themes: Intergenerational Dialogue in Geotechnics; and, International Major Projects.


Intergenerational Dialogue in Geotechnics: Lectures are to discuss conflict and dialogue; ways to learn from and work together; tradition versus future; and, interestingly, a spotlight on ‘Lack of Know-how Transfer’ in geotechnical works. After time out for a breather, the theme continues


for the rest of the morning, considering the profiles of different generations; how industry approaches to geotechnics has evolved; and, a ‘Transalpine perspective’ on the generation gap.


International Major Projects: Looking at a range of transport and water projects from Asia as well as central Europe. Lots of speakers, and detail. The projects to be covered involve a wide variety of tunnelling and ground conditions, much dealing with groundwater in different scenarios, including using a pilot tunnel for drainage and urban excavations with compressed air, respectively.


Colloquium: 10 Oct The morning of 10 October will round off the lectures of the Colloquium by covering two themes: Constructive Aspects of Tunnel Construction; and, Hydraulic Underground Structures.


Constructive Aspects of Tunnel Construction: Under the theme Constructive Aspects of Tunnel Construction there are to be five presentations,


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