Geomechanik und Tunnelbau最新文献

In the heart of Munich's city centre, the new Marienhof station is being built for the second S-Bahn main line. The new central access structure is being constructed using the diaphragm wall method and, at a depth of 42 m, is the deepest excavation pit in Germany to date. The platform tunnels for the station and a connecting tunnel to the existing U3/U6 underground line are also being driven from the excavation pit at Marienhof using the mine driving method under compressed air. The following article provides an overview of the status of the work and the special features of the connecting tunnel excavation.

The intensively dissected and highly permeable carbonate rocks of the Grassberg, as well as the tectonically strongly overshaped edge areas of the Grassberg, represent geotechnically particularly challenging zones for tunnelling work. The first exploratory boreholes already revealed water ingress with flow rates of over 100 l/s in combination with significant material discharge. The location of the key zone directly below the S6 expressway required a modification of the original planning approach. Due to the erosion-prone and unstable rock in the peripheral zone, two large-scale injection screens with 97 and 75 injection boreholes per shield with lengths of 50–70 m were required for each railway tube. The subsequent excavation was carried out in sections in 7 m long stages, each with 59 pieces and 24 m long cased injection wells. To reduce settlement, an additional 32 pieces of pipe umbrella pipes with a length of 15 m were executed per stage. In the upcoming carbonate, the tunnelling was carried out with injection screens according to the top-down system. For each 10 m long tunnelling stage, uncased boreholes with a length of between 5 and 20 m were drilled. Depending on the conditions encountered, the injections were carried out using Portland cement, hybrid mortar, ultra-fine binder, silicate gel and polyurethane.

SSE Renewables is one of the UK's leading renewable energy developers and plans to build the first pumped storage power plant in over 40 years with the Coire Glas project. The fully underground facility at Loch Lochy in the Scottish Highlands will have a capacity of 1300 MW and a storage capacity of 30 GWh, which will more than double the UK's current storage resources. In preparation, geotechnical investigations began in 2022 under the name “Coire Glas Exploratory Works”. STRABAG UK Ltd was awarded the contract following a public tender and work began in November 2022. A major part of the project was the construction of an initial 0.9 km long exploratory tunnel, the length of which was extended to 1.2 km during the course of the work. The aim of the investigations was to record the geological and hydrological conditions in order to safeguard the planning of underground structures such as pressure shafts, turbine and transformer caverns and access tunnels.

The rapid development of new technologies and advances in science as ‘tools’ for specialists do not always bring the promised benefits. In a dialogue between retired, active and future generations of geoscientists and engineers, this contribution highlights the technical aspects as well as the human relationships. Especially in remote alpine areas, infrastructure design is increasingly confronted by spatial conflicts of interest in times of global environmental change. While the focus was mainly on solving technical problems (the art of engineering) 50 years ago, today the Procurement Law, environmental regulations and the accomplishment of procedures come first. New trends in contractual cooperation between client and contractor give hope that the technical challenges will once again take centre stage. In addition, the methods and technologies available to us are developing at rapid pace. Future generations face the significant challenge of not only gathering virtual data but also understanding it, verifying it, and ultimately generating added value. Our experience in science, geoscience and engineering shows, that interdisciplinary and intergenerational communication has to be enhanced in order to cope with the challenges of global change.

The Limberg III PSW expands the Kaprun-Salzach power plant group operated by VERBUND Hydro Power GmbH (VHP) by an installed capacity of 480 MW in both pump and turbine operation. The project created an additional connection between the two annual storage reservoirs Mooserboden and Wasserfallboden, which have a combined storage capacity of 166 million m³. The headrace system leads via the intake tunnel to the Drossen valve chamber and from there via the headrace tunnel to the surge system. The adjoining pressure shaft overcomes a height difference of 374.6 m over a length of 562 m and leads into the headrace distribution conduit. The geometry of the lower surge chamber and the lining system of the pressure shaft were optimised in terms of construction operation and economic considerations. This paper highlights different aspects and draws a conclusion.

This paper offers a critical examination of the concept of generational labels, such as Millennials, Generation Z, and Baby boomers and questions both its scientific foundation and practical relevance. It is argued that such classifications are frequently based on stereotypes which are not only indiscriminate but also potentially exclusionary, thereby constituting a form of ‘generationalism’.

The paper advocates instead an empathetic and individualised approach that recognises the uniqueness of each person, shaped by personal experience and their upbringing. In the context of organisational collaboration, chronological age should be seen as secondary to the active promotion of diversity, relationship-building, and open discussion. Only in this way can individual talents be nurtured, learning processes facilitated, and sustainable development ensured, regardless of to which generation people belong.