Semmering Base Tunnel – Design and construction of the shaft head caverns under difficult conditions

Wieland, Gerd; Prall, Karoline; Lenz, Gerold; Schachinger, Tobias; Gobiet, Gerhard

doi:10.1002/geot.201800040

Cited by 4 publications

(2 citation statements)

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“…Consequently, the shaft head caverns were replanned and the shaft axes moved 15 respectively 30 m to the north. This is described in detail in [4].…”

Section: Overview Of the Göstritz Intermediate Construction Accessmentioning

confidence: 99%

“…The original tender concept envisaged two shafts with a diameter of 9 and 7 m respectively; a larger main shaft for logistical supplies, mucking, fresh air ventilation and a smaller secondary shaft for transportation of machinery and exhaust air ventilation. In this case the concept for the Sedrun intermediate construction access at the Gotthard Base Tunnel construction site [4] was used for orientation during the design phase. The alternative construction proposal introduced and implemented by the construction company was elaborated primarily due to construction logistics constraints Für die logistische Versorgung im Förderbetrieb stehen je Schacht drei unabhängige Seilwindenanlagen zur Ver-(Figure 7).…”

Section: Shaft Logisticsmentioning

confidence: 99%

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Logistic challenges at contract SBT 1.1 – Intermediate construction access Göstritz

Entfellner¹,

Hauer²,

Bauer³

2021

Geomechanics and Tunnelling

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Base tunnels usually require temporary intermediate construction accesses in order to be able to carry out the tunnelling work in a timely, economical and logistical reasonable scope. Intermediate construction accesses in the form of shafts lead to particular logistical challenges in supplying the tunnel headings. At contract SBT 1.1‐Tunnel Gloggnitz as the eastern section of the Semmering Base Tunnel, the shafts of the intermediate construction access Göstritz cannot be sunk from the surface for topographical reasons but are instead developed by an access tunnel. This fact requires the construction of complex underground structures and logistical interfaces to supply the four tunnel headings, beginning from the building site facilities, via the access tunnel, through the shafts to the tunnel face. In addition to the ongoing supply of all kinds of support measures, the excavated material is mucked by means of fully automatic belt and shaft conveyor systems. To ensure the permanent safety of the crew on‐site, the highest demands and resilience are placed on the transport systems through the two 250 m deep shafts, the ventilation and the mountain water drainage systems of up to 500 l/s. The article describes the experience and ongoing optimization of the logistics concept as well as innovative new developments that are applied in this special tunnel project.

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“…Consequently, the shaft head caverns were replanned and the shaft axes moved 15 respectively 30 m to the north. This is described in detail in [4].…”

Section: Overview Of the Göstritz Intermediate Construction Accessmentioning

confidence: 99%

Section: Shaft Logisticsmentioning

confidence: 99%

Logistic challenges at contract SBT 1.1 – Intermediate construction access Göstritz

Entfellner¹,

Hauer²,

Bauer³

2021

Geomechanics and Tunnelling

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Drilling and Grouting Works for Pressurised Groundwater Conditions of the Semmering Base Tunnel

Wannenmacher

Entfellner

Hauer³

2022

Geotech Geol Eng

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The Semmering Base Tunnel (SBT), with a total length of 27.3 km, is one of the leading construction projects of the Baltic-Adriatic Railway Network. The tunnel connects the two federal provinces of Lower Austria and Styria and cuts through the eastern part of the Alps. The construction lot SBT 1.1-Tunnel Gloggnitz is characterized by a complex geological- and hydro-geological architecture containing alternating competent geological structures, major fault zones, and corresponding geological transition zones. There are three main water-bearing formations at the construction lot SBT 1.1: (a) Karst-prone blocky limestone with an initial water pressure of 10 bar. The discontinuities form a highly permeable interconnected joint network with a significant storage coefficient of the groundwater table. (b) Massive to blocky dolomite with an initial water pressure of 25 bar. The systematic discontinuities and disturbed zones of subsidiary structures with karst form a permeable, interconnected joint network. (c) The transition zone of the limestone to base structure marks the most challenging area for consolidation- and sealing grouting. Weak fault rocks characterize transition zones with intense fracturing. However, as subjected to high groundwater pressure of 10 bar, these zones are associated with the potential of flowing ground conditions. Based on the overall project requirements, specific drilling- and grouting methods and materials for pre-excavation grouting have been established and successfully implemented in the construction process. The innovations include a Standpipe-Packer substituting a conventional steel standpipe, a specifically cased drilling system with grouting inserts to prevent erosion within the borehole and allow for defined grouting. In addition, this Grouting-Pipe system replaces standard tube-à-manchettes and controls the flushing while drilling with preventers. Finally, a combined cement-polyurethane grout mix (Hybrid Grout) was implemented to stabilize the grout. The implementation of these measures will be discussed in detail, and their benefits to the construction process will be highlighted.

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Distributed Fiber Optic Sensing on a Large Tunnel Construction Site: Increased Safety, More Efficient Construction and Basis for Condition-Based Maintenance

Lienhart

Buchmayer

Klug

et al. 2019

International Conference on Smart Infrastructure and Construction 2019 (ICSIC)

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Semmering Base Tunnel – Design and construction of the shaft head caverns under difficult conditions

Cited by 4 publications

References 1 publication

Logistic challenges at contract SBT 1.1 – Intermediate construction access Göstritz

Logistic challenges at contract SBT 1.1 – Intermediate construction access Göstritz

Drilling and Grouting Works for Pressurised Groundwater Conditions of the Semmering Base Tunnel

Distributed Fiber Optic Sensing on a Large Tunnel Construction Site: Increased Safety, More Efficient Construction and Basis for Condition-Based Maintenance

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