Dynamic Non Linear Soil Behaviour In Alpine Areas
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Dynamic Non Linear Soil Behaviour In Alpine Areas
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Author : Alexandru Marin
language : de
Publisher: vdf Hochschulverlag AG
Release Date : 2019-10-04
Dynamic Non Linear Soil Behaviour In Alpine Areas written by Alexandru Marin and has been published by vdf Hochschulverlag AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-10-04 with Science categories.
On The Variability Of Squeezing Behaviour In Tunnelling
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Author : Florence Mezger
language : en
Publisher: vdf Hochschulverlag AG
Release Date : 2020-07-01
On The Variability Of Squeezing Behaviour In Tunnelling written by Florence Mezger and has been published by vdf Hochschulverlag AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-07-01 with Technology & Engineering categories.
On the variability of squeezing behaviour in tunnelling
Instabilities In Alpine Permafrost Strength And Stiffness In A Warming Regime
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Author : Yuko Yamamoto
language : en
Publisher: vdf Hochschulverlag AG
Release Date : 2014-08-20
Instabilities In Alpine Permafrost Strength And Stiffness In A Warming Regime written by Yuko Yamamoto and has been published by vdf Hochschulverlag AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-08-20 with Science categories.
Alpine permafrost exists at high altitude at lower latitudes, such as in the Swiss Alps. Accelerating climate change, including rising mean annual air temperature and extreme rainfall conditions in alpine regions induces permafrost degradation. The warming of permafrost causes accelerated creep of rock glaciers, due to increased unfrozen water content and higher deformability of the ice phase. Recently, the development of deepening depressions has been observed in several rock glaciers in Switzerland, and the changes in land surface characteristics and drainage systems may initiate slope instabilities in rock glaciers. The main aim of this thesis is to characterise the strength and stiffness of alpine frozen soil in rock glaciers. To this end, the geotechnical response, such as creep and failure of frozen soil was investigated through a triaxial stress path testing programme with novel measurement systems for detecting acoustic emissions and measuring volumetric change. In addition, the resistance to crack initiation and propagation was investigated through a beam bending test programme on rectangular artificially frozen soil specimens, using the acoustic emission measurement system. The evaluation of laboratory tests on artificially frozen soil specimens implied that the development of deep depressions in rock glaciers occurs through differential creep and thermal degradation, and that the rate of deformation has the potential to lead to instabilities in rock glaciers. A comparison of the simulation results with the experimental data demonstrated that the semi-coupled model was successful in simulating the most important aspects of the temperature-dependent stress-strain relationship for the frozen soil behaviour that was measured at the element scale. This thesis contributes to an understanding of the variations in geotechnical response of alpine permafrost, by investigating the behaviour of artificially frozen soil specimens experimentally and numerically with time and temperature under specific stress paths. However, further investigations are necessary to assess the long-term stability of rock glaciers affected by climate change.
Validation Of Dynamic Analyses Of Dams And Their Equipment
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Author : Jean-Jacques Fry
language : en
Publisher: CRC Press
Release Date : 2018-06-27
Validation Of Dynamic Analyses Of Dams And Their Equipment written by Jean-Jacques Fry and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-27 with Technology & Engineering categories.
Validation of Dynamic Analyses of Dams and Their Equipment is the outcome of a three year cooperation program between CFBR (Comite Francais des Barrages et Reservoirs or French Committee on Large dams) and JCOLD (Japan Commission on Large Dams), and focusses on the dynamic behavior of concrete and embankment dams analyzed based on acceleration records of the JCOLD data base. The book covers a broad range of topics, including simplified and detailed methods of dynamic analysis for the seismic response of concrete and embankment dams compared with measured behavior. The response of embankment dams subjected to a 1.0 g foundation acceleration time history is computed by several analytical methods and compared. The modelling of stress-strain behavior of compacted soils for seismic stability analysis of earth-fill dams and its application for a failed earthfill dam is described. The cracking of the face slab of four faced rockfill dams during earthquakes is analyzed. The seismic behavior of concrete arch dams is discussed by the comparison of numerical and experimental results. Displacement-based seismic assessment of concrete dams is presented. Finally the book contains a comparison between the Japanese and French design criteria of gates and a comparison of the analysis of gates and field measurements. Validation of Dynamic Analyses of Dams and Their Equipment will be useful to professional and academics involved or interested in dam engineering.
Landslide Hazards In Alpine Region Mechanics And Mitigation
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Author : Yun Zheng
language : en
Publisher: Frontiers Media SA
Release Date : 2022-11-01
Landslide Hazards In Alpine Region Mechanics And Mitigation written by Yun Zheng and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-11-01 with Science categories.
Geographical Abstracts
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Author :
language : en
Publisher:
Release Date : 1986
Geographical Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Geographical abstracts categories.
Subject index to various sections of Geo abstracts.
Geographical Abstracts Index
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Author :
language : en
Publisher:
Release Date : 1986
Geographical Abstracts Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
Petroleum Abstracts
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Author :
language : en
Publisher:
Release Date : 1991
Petroleum Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Petroleum categories.
Grassland Invertebrate Interactions Plant Productivity Resilience And Community Dynamics
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Author : Ivan Hiltpold
language : en
Publisher: Frontiers Media SA
Release Date : 2017-10-13
Grassland Invertebrate Interactions Plant Productivity Resilience And Community Dynamics written by Ivan Hiltpold and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-10-13 with categories.
Natural and anthropogenic grasslands such as prairies, meadows, rangelands, and pastures cover more than 40% of the planet’s surface and provide a wealth of ecological services. Grasslands alone store one third of the global carbon stocks and grass roots, through their specific architectures, ensure water cycling and prevent the erosion of fertile topsoil. In addition, grasslands are of vital importance for human food production as vast areas of rangelands and pastures provide feed for livestock. Pastoral legumes mobilize atmospheric nitrogen and improve fertility of arable soils. Not least, grasslands are an essential genetic resource. The three major crop species that feed half of the global population have been bred from wild grasses. Ancestors of our contemporary turf cultivars, common components of urban landscapes and recreation spaces, originated from wild grasslands. Although natural and managed grasslands represent pivotal ecosystems, many aspects of how they function are poorly understood. To date, most attention has focused on grassland primary producers (i.e. forage plants) and mammalian grazers but invertebrates are likely to play an equally, if not more important role in grassland ecosystem functioning. In Australian pastures, for example, the biomass of root-feeding scarab beetles can often exceed that of sheep and plant damage caused by invertebrates is sometimes equivalent to an average dairy cow’s grass consumption. Indeed, grasslands are one of the most densely populated ecosystems with invertebrates being probably the most important engineers that shape both plant communities and the grassland as a whole. In a rapidly changing world with increasing anthropogenic pressure on grasslands, this Research Topic focuses on: 1. How grassland habitats shape invertebrate biodiversity 2. Impacts of climate change on grassland-invertebrate interactions 3. Plant and invertebrate pest monitoring and management 4. Plant-mediated multitrophic interactions and biological control in grasslands 5. Land use and grassland invertebrates 6. Plant resistance to invertebrate pests Given the increasing demand for food and land for human habitation, unprecedented threats to grasslands are anticipated. Resilient to some extent, these key ecosystems need to be better comprehended to guarantee their sustainable management and ecosystem services.
The Urban Fluvial And Hydro Environment System
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Author : Jaan H. Pu
language : en
Publisher: Frontiers Media SA
Release Date : 2022-12-29
The Urban Fluvial And Hydro Environment System written by Jaan H. Pu and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-12-29 with Science categories.