Artikeldatenbank
Autor(en) | Titel | Zeitschrift | Ausgabe | Seite | Rubrik |
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Moormann, Christian; Buhmann, Patrik; Friedemann, Wolf; Homuth, Sebastian; Pralle, Norbert | Tunnel geothermics - International experience with renewable energy concepts in tunnelling / Tunnelgeothermie - Internationale Erfahrungen zu regenerativen Energiekonzepten im Tunnelbau | Geomechanics and Tunnelling | 5/2016 | 467-480 | Topics |
KurzfassungShallow geothermal energy now provides an essential contribution to the base load of heating energy. The thermal activation of tunnels is an interesting alternative and an economically appropriate supplement to the present hybrid systems in the field of ground engineering. An essential difference between the tunnel absorber and structures such as activated piles and diaphragm wall elements is the use of heat fluxes from the ground, as well as from the inside of the tunnel. Due to this circumstance, the tunnel absorber is assigned to the group of the duo-hybrid systems. The tunnel air temperature is essential for the heat flux inside the tunnel. Stuttgart-Fasanenhof and Jenbach are two geothermal tunnel plants which have been delivering dependable measurement data of the subsoil temperature, the tunnel lining temperature and the tunnel air temperature for four years. Based on the selected operation modes and case studies, the measurement results are analyzed and discussed. In addition, the possible geothermal potential of a geothermal tunnel system is introduced. x | |||||
Lorenz, Stefan; Stoxreiter, Thomas; Galler, Robert | MinTherm - Utilization of the overburden of existing underground structures for deep geothermal projects / MinTherm - Geothermische Nutzung des Überlagerungspotenzials in unterirdischen Infrastrukturen für tiefe Geothermie | Geomechanics and Tunnelling | 5/2016 | 481-488 | Topics |
KurzfassungThe research study was intended to investigate the potential use of geothermal energy power plants in subsurface infrastructure such as tunnels and active or closed mines. The aims of the study was to examine the geological and geothermal conditions of a tunnel and a mine to survey the drilling technologies and necessary infrastructures for the drilling of deep boreholes as well as to determine rock, operating and process parameters and safety aspects in case of subsurface structures. The results are given in an evaluation matrix, which assembles the collected data and describes the specific boundary conditions of the tunnel projects and the mine as well as the risks of project Implementation. x | |||||
Fruhwirth, Rudolf K.; Hofstätter, Herbert | An innovative approach for optimising geothermal energy recovery / Tiefe geothermische Energiegewinnung - Innovative Wege zur Optimierung | Geomechanics and Tunnelling | 5/2016 | 489-496 | Topics |
KurzfassungThe overall economics of a geothermal project are basically governed by the formation temperature gradient and the productivity of the reservoir. At the Chair of Petroleum and Geothermal Energy Recovery, a simulator has been developed considering different well geometries and casing strings or liner completions as well as total or partial cementation. In order to optimize heat transfer or to minimize losses, various tubing types like gas- or vacuum isolated pipes as well as relined or outside coated pipes can be simulated. The program also allows the simulation of transient states as well as the circulation of various media with various rates in closed systems. This enables the optimisation of energy recovery by simulating various materials and circulation rates over a long term, which is essential for the evaluation of the economical limits and energy efficiency of a geothermal project. The program can also be used for the simulation of oil and gas production since the conservation of energy results in less friction losses and higher flow velocities in gas wells which finally results in better deliquification behaviour. x | |||||
Poisel, Rainer; Kolenprat, Bernd; Bertagnoli, Michael; Ahmadabadi, Morteza; Grasemann, Bernhard; Hödlmoser, Nikolaus | The rockslide hazard in the former quarry near Spitz and its foreland / Die Felssturzgefahr im ehemaligen Tagebau Spitz a. d. Donau und dessen Vorland | Geomechanics and Tunnelling | 5/2016 | 497-507 | Topics |
KurzfassungIn the former quarry near Spitz many rockslides have occurred during operation as well as after closure. They endangered a railway, the Wachau-bicycle route, an important road and the left Danube river bank. Therefore, a protection embankment and a rock fall fence were constructed as well as a monitoring system installed automatically closing all traffic routes, when rock face displacements are exceeding a threshold. In order to clarify the need for risk reduction measures, the hazard caused by the former quarry near Spitz was investigated by x | |||||
Schütz, Holger; Konietzky, Heinz | Studies of flooding induced by seismicity in the Schlema-Alberoda uranium mine / Untersuchungen zur flutungsinduzierten Seismizität im Uranerzbergwerk Schlema-Alberoda | Geomechanics and Tunnelling | 5/2016 | 508-514 | Topics |
KurzfassungThe uranium mine in Schlema-Alberoda near the town Aue in south-east Germany was operated between 1947 and 1990. In 1979, a seismic event with local magnitude of ML = 2.9 and intensity MSK = 5 (Medvedev-Sponheuer-Karnik scale) was monitored close to the mining area. Due to this event and observations of underground dynamic de-stressing, a local seismic network was installed and extended in the following years. Seismic events were routinely located and source parameters for selected events were determined [1], [2]. It was found that most of the sources of dynamic events are located outside the mine, in the neighbouring granitic intrusion. During the period of active mining, continuous online evaluation of seismic events was performed in conjunction with online hazard evaluation [2]. x | |||||
Gaul, Felix; Eggenreich, Stefan | Installation of a microseismic monitoring system in the Mittersill scheelite mine / Aufbau eines mikroseismischen Ãœberwachungssystems im Mittersiller Scheelit Bergbau | Geomechanics and Tunnelling | 5/2016 | 515-523 | Topics |
KurzfassungThe 500.000 t/a underground Mittersill scheelite mine produced around 12 Mio. t during its 40 year lifetime. The active western field dips with 55° to the NNW under the western flank of the steep valley. The ore zone is developed over a vertical length of 600 m from its outcrop at 1.250 m down to the 650 m asl. The deepest workings are already more than 1.000 m below surface due to the dipping below the mountain range. Open stoping with backfill, cut and fill as well as sublevel caving are the prominent mining methods. End of 2015 a micro seismic system from Canadian ESG Solution was installed to get a better understanding of induced stresses and movements in rock formation. As of December 2015 the system consisting of ten sensors are constantly recording all microseismic events in the mine at a depth between 500 and 1.000 m. The events are analysed and graphically displayed according their location, magnitude and category. x | |||||
Wagner, Horst; Ladinig, Tobias; Blaha, Hannes | Design considerations for pillar systems in deep mines | Geomechanics and Tunnelling | 5/2016 | 524-528 | Topics |
KurzfassungPillar systems in mines are statically indeterminate systems. The paper presents the results of numerical investigations to evaluate the effects of panel dimensions on pillar loads. It is shown that pillar load in deep mines is strongly influenced by the lateral and vertical extent of extraction panels. The commonly applied tributary area concept does not account for these effects and is an oversimplification that has to be applied with caution. The effects of local pillar failures on stability of pillar workings are examined using simple models. It is shown that limiting panel dimensions by substantial barrier pillars can reduce the danger of regional pillar collapses and enhance overall mine stability. x | |||||
Gomes, Alexandre R.A.; Rojas, Eduardo; Ulloa, Juan Carlos | Severe rock mass damage of undercut and extraction level pillars at El Teniente Mine | Geomechanics and Tunnelling | 5/2016 | 529-533 | Topics |
KurzfassungThe El Teniente Mine of Codelco is one of the largest underground mine operations in the world. The mine employs massive mechanised panel caving methods with pre-undercut variants to extract copper-molybdenum ore, producing 140,000 t/d, mainly of primary copper ore. In the context of a study of rehabilitation measures for collapsed zones at the Esmeralda mine, which is one of Tenientés most important operations, a preliminary assessment of the post-collapse pillar's rock mass condition was carried out, allowing the characterization of the damage zone surrounding the drifts and some insights into the likely pillar's rock mass damage development. The paper outlines these findings and discusses some underlying factors that may also have influenced the process. x | |||||
Klitzen, Jens; Herdina, Johann | Hydroshield drive with a diameter of 13 m in the Lower Inn Valley - Project design and experience from construction of contract H3-4 / Hydroschildvortrieb mit 13 m Durchmesser im Unterinntal - Projektplanung und Erfahrungen im Baulos H3-4 | Geomechanics and Tunnelling | 5/2016 | 534-546 | Topics |
KurzfassungIn the Lower Inn Valley of the Tyrol, Autria, the existing railway line has been upgraded. In the course of these works a two-track tunnel with an excavated diameter of 13.03 m was built in the track section H3-4 Münster/Wiesing. The tunnel was excavated with a slurry TBM. Demanding geotechnical conditions on this difficult contract necessitated changes to the overall concept. After tendering and the award of contract, the client and the contractor started the construction phase with different expectations. We report on the strongly differing experiences of the parties during the construction of the works. At the end, we draw conclusions for both parties from the experience gained during the successful completion of the project. x | |||||
Daller, Josef; Diewald, Martin; Lemmerer, Johann; Zwittnig, Gerald | Expectations and reality of the mechanised tunnel drives for the Wienerwald Tunnel / Erwartung und Wirklichkeit der TBM-Vortriebe am Wienerwaldtunnel | Geomechanics and Tunnelling | 5/2016 | 547-555 | Topics |
KurzfassungThe 13.35 km long Wienerwald (Vienna Woods) Tunnel forms a key element of the new railway line between Vienna and St. Pölten. The 11 km long twin-tube western section of the tunnel was constructed using two tunnel boring machines, type TBM-S, with an excavation diameter of approximately 10.7 m, and a water pressure-relieved, double shell lining system. A Swiss unsealed, stacked segment lining system was used. In the year 2000, a TBM with these dimensions represented new territory for ÖBB-Infrastructure AG, so intensive investigations of the technology were undertaken from the feasibility study and permit application phases onwards. Risk analyses in respect of geotechnical engineering, TBM design and segmental tunnel lining, cross-checking of the construction schedule and costs that were estimated during the tender phases were undertaken. Together with a comprehensive and thorough investigation, this led the client to the conclusion that the tunnelling work in the western section should be tendered with two alternatives (conventional tunnelling and TBM drive). Appropriate tender evaluation criteria allowed an objective comparison of the submitted tenders to be made and resulted in an unproblematic contract with the western section being awarded for the TBM system. The expectations of the client and the contractor with regard to geology and geotechnics, construction schedule and construction process are described. Deviations from these expectations and the actual technical and construction difficulties encountered are explained, along with the corresponding solutions that were used to overcome these problems. x | |||||
Jesel, Thomas; Amberg, Felix; Rohrer, Thomas | TBM drives at the Gotthard Base Tunnel - Design and experience from tunnelling in Faido / TBM-Vortriebe am Gotthard Basistunnel - Projektierung und Erfahrung aus dem Vortrieb Faido | Geomechanics and Tunnelling | 5/2016 | 556-568 | Topics |
KurzfassungIn the course of designing the Gotthard Base Tunnel, extensive questions were considered about the tunnelling conditions to be expected and the resulting requirements for the TBM. Naturally this mainly concentrated on the achievable advance rates and the associated costs. The tunnelling works have now been completed and the essential assumptions and decisions from the design phase could be confirmed. Experience does however also show that the behaviour of the rock mass could not always be correctly predicted in its entireness and a corresponding flexibility in the use of support measures is unavoidable, which is only possible with suitable tunnelling equipment and machinery. The present article collects the essential data and facts from the TBM drives and described the areas where significant deviations arose. Particular attention is paid to the following subjects and the corresponding effects: wear to the cutterhead, heavy water ingress, rockburst, reciprocal influencing of the two tunnel drives under poor geological conditions and the collapse in the Tenelin Zone. The stated matters are described with a comparison against the assumptions made in the design phase and a complemented with few of the lessons learnt. x | |||||
Köhler, Hans; Rengshausen, Rainer | Metro Doha Green Line - EPB TBM tunnelling under very special circumstances / Metro Doha Green Line - EPB-Vortriebe unter Berücksichtigung sehr spezieller Randbedingungen | Geomechanics and Tunnelling | 5/2016 | 569-579 | Topics |
KurzfassungAs part of the Qatar National Vision 2030, the capital of Qatar - Doha - is being expanded into a modern centre for economy, trade and sport. A main part of this plan is the establishment of an efficient infrastructure with modern means of transportation. x | |||||
Benedikt, Johannes; Lemmerer, Johann; Köpf, Manfred; Obermeier, Oskar | Excavation of the Perschling Tunnels by TBM - expectations and reality - lessons learned / TBM-Vortrieb Tunnelkette Perschling - Erwartung und Wirklichkeit - Erfahrungen und Erkenntnisse | Geomechanics and Tunnelling | 5/2016 | 580-594 | Topics |
KurzfassungIn the course of constructing the new Vienna - St. Pölten high-speed railway line, three TBM tunnels with an excavated diameter of approx. 13 m were driven between 2005 and 2010. The total length of these three tunnels including portal structures, cut-and-cover and top-down sections was approx. 7.4 km, of which 6.2 km were excavated by TBM-S. The tunnels were constructed with drainage systems and two-pass linings in the tunnel arch. During the feasibility study, the permit application design and the tender design phase, detailed risk analyses were performed for excavation method (TBM or NATM), machine type (TBM-S or SM-EPB) and lining type (single- or two-pass). The expectations of the client during the design phase and those of the contractor during the bidding phase are compared and discussed, taking into account construction time considerations, geotechnical risk assessments, lining design, machine type and construction sequence as well as the allocation of risks between client and contractor. The reality of the project, i.e. the construction time actually needed, the challenges encountered, the problems solved and the joint approach adopted to implement the project as well as the lessons learned (experiences and findings) are all described. x | |||||
Bullflex - structural sealing for underground construction / Bullflex Abdichtungssysteme für den Untertagebau | Geomechanics and Tunnelling | 5/2016 | 595-596 | Product Informations | |
Diary of Events: Geomechanics and Tunnelling 5/2016 | Geomechanics and Tunnelling | 5/2016 | 597-598 | Diary of Events | |
Imprint: Geomechanics and Tunnelling 5/2016 | Geomechanics and Tunnelling | 5/2016 | 599 | Imprints | |
Inhalt: Mauerwerk 5/2016 | Mauerwerk | 5/2016 | Inhalt | ||
Jäger, Wolfram; Stürmer, Franka | Professor Dr.-Ing. Wolfgang Brameshuber verstorben | Mauerwerk | 5/2016 | 337 | Nachruf |
Brameshuber, Wolfgang | Assessment, analysis, construction and testing of masonry / Schätzung, Berechnung, Ausführung und Prüfung von Mauerwerk | Mauerwerk | 5/2016 | 338-339 | Editorials |
Graubohm, Markus; Brameshuber, Wolfgang | Determining the masonry compressive strength / Bestimmung der Druckfestigkeit von Mauerwerk | Mauerwerk | 5/2016 | 340-351 | Fachthemen |
KurzfassungMasonry is a building material primarily suited for building structures under compressive load and therefore it is mainly used for vertical load transfer. The decisive characteristic to assess the load bearing capacity of such building members is their compressive strength. It can either be derived experimentally from compression tests on wall specimens or by calculation. In this paper, firstly the current procedure in the derivation of compressive strength values based on experimental compression tests is described. Furthermore, empirical approaches and theoretical models for determining the masonry compressive strength, which have been developed in the past, are presented. x | |||||
Ramos, LuÃs F.; Lourenço, Paulo B.; Vermeltfoort, Ad. T.; Moreira, Susana | A students' challenge for the estimation of the maximum compressive load of masonry prisms / Studentenwettbewerb zur Ermittlung der maximalen Druckfestigkeit von Mauerwerksprismen | Mauerwerk | 5/2016 | 352-363 | Fachthemen |
KurzfassungThe paper presents the “IMC Students' Challenge” competition held in 2014, during the 9th International Masonry Conference, in Guimarães. The objective of the competition was to predict the maximum compressive load of two masonry prisms built of solid bricks, and of hollow blocks, with mortar joints. To increase the complexity of the problem, all prisms were tested under eccentric load. The students, who enthusiastically participated in the final laboratory tests, presented different approaches to estimate the maximum eccentric compressive force on masonry prisms. The challenge was a great experience, not only for students and conference participants, but also for sponsors and organizers. x | |||||
Sculptural building design wins Iconic Award / Skulpturaler Gebäudeentwurf mit Iconic Award ausgezeichnet | Mauerwerk | 5/2016 | 363 | Aktuell | |
Sommerlade, Kai; Seim, Werner | Bracing systems in masonry buildings / Aussteifungssysteme im Mauerwerksbau - Part 2: Structural analysis methods in comparison / Teil 2: Berechnungsmodelle im Vergleich | Mauerwerk | 5/2016 | 364-368 | Fachthemen |
KurzfassungIn this article, an FE analysis model suitable in engineering practice for masonry bracing walls acting as deep beams without tensile strength is compared with simple models based on trusses. The results of both processes are compared through the example of a four-storey building of Poroton masonry. x | |||||
Saenger, Dorothea; Brameshuber, Wolfgang | Longitudinal compressive strength of masonry - Simplified calculation approach / Längsdruckfestigkeit von Mauerwerk - Vereinfachter Berechnungsansatz | Mauerwerk | 5/2016 | 369-380 | Fachthemen |
KurzfassungFor the structural analysis of the bending compression zone of masonry building elements, which are loaded under bending compression parallel to the bed joints, the longitudinal compressive strength of the masonry is required. According to the code, this value has until now been determined in laborious tests on masonry building elements or calculated analogously to the approach for the determination of the compressive strength perpendicular to the bed joints. In such a way, the actual failure mechanisms of masonry under compression loading parallel to the bed joints and relevant influential parameters for the longitudinal compressive strength however remain unconsidered. The article presents a proposal for the determination of minimum values of the longitudinal compressive strength of masonry in a simplified form for structural design purposes, which include consideration of both the relevant failure cases and also the significant influential parameters. x | |||||
Retaining walls - Town walls - Boundary walls | Mauerwerk | 5/2016 | 380 | Termine | |