Refine
Year of publication
- 2010 (331) (remove)
Institute
- Fachbereich Medizintechnik und Technomathematik (68)
- Fachbereich Wirtschaftswissenschaften (41)
- Fachbereich Elektrotechnik und Informationstechnik (36)
- IfB - Institut für Bioengineering (36)
- Fachbereich Energietechnik (35)
- Fachbereich Chemie und Biotechnologie (34)
- Fachbereich Maschinenbau und Mechatronik (31)
- Fachbereich Luft- und Raumfahrttechnik (24)
- Fachbereich Bauingenieurwesen (23)
- INB - Institut für Nano- und Biotechnologien (23)
Has Fulltext
- no (331) (remove)
Document Type
- Article (177)
- Conference Proceeding (67)
- Book (37)
- Part of a Book (20)
- Conference: Meeting Abstract (12)
- Patent (7)
- Report (4)
- Other (2)
- Contribution to a Periodical (1)
- Doctoral Thesis (1)
Keywords
- Geschichte (2)
- avalanche (2)
- Adsorbentien (1)
- Cardiovascular MRI (1)
- Cardiovascular Magnetic Resonance (1)
- Commercial Vehicle (1)
- Common Rail Injection System (1)
- Diesel Engine (1)
- Enzymatischer Ligninabbau (1)
- European Transient Cycle (1)
Realization of a calorimetric gas sensor on polyimide foil for applications in aseptic food industry
(2010)
Various models have been proposed for the prediction of the necessary support pressure at the face of a shallow tunnel. To assess their quality, the collapse of a tunnel face was modelled with small-scale model tests at single gravity. The development of the failure mechanism and the support force at the face in dry sand were investigated. The observed displacement patterns show a negligible influence of overburden on the extent and evolution of the failure zone. The latter is significantly influenced, though, by the initial density of the sand: in dense sand a chimney-wedge-type collapse mechanism developed, which propagated towards the soil surface. Initially, loose sand did not show any discrete collapse mechanism. The necessary support force was neither influenced by the overburden nor the initial density. A comparison with quantitative predictions by several theoretical models showed that the measured necessary support pressure is overestimated by most of the models. Those by Vermeer/Ruse and Léca/Dormieux showed the best agreement to the measurements.