WANDLAND · Effects of wetting and drying cycles on landslide activity
7РП — „Хора“ (Действия „Мария Кюри“)
- Период
- 2010-06-01 → 2013-05-31
- Финансиране от ЕС
- 45 000 €
- Участници
- 1
- Схема
- MC-ERG
Линиите свързват координатора с партньорите.
Накратко на български
Циклите на намокряне и изсушаване на почвата влияят върху стабилността на склоновете и риска от свла same. Това помага за по-доброто разбиране и предвиждане на опасните свлагания, които застрашават човешкия живот и инфраструктурата.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Effects of wetting and drying cycles on landslide activity
The purpose of this project was to improve the capabilities to understand and predict the occurrence of landslide crisis episodes associated with alternated rainfall patterns. Landslides are among the most severe problems that affect mankind in terms of loss of human life, damages to infrastructure and irreversible changes of natural environment. The situation is even more alarming when forecasts on clime evolution are taken into account and considering the associated changes in hydrological cycles and rainfall patterns (more extreme rainfall events and concentrated rain within shorter periods of time are expected). Despite the expected impacts, many issues have yet to be addressed to develop tools and methodologies able to protect people and property from these growing natural hazards. From a geomechanical prospective, the link between the rainfall patterns and landslide occurrences is related to both the heavy modifications of pore fluid pressure distributions associated with these phenomena and the consequent changes in available shear strength within the slope. However, this kind of phenomena cannot be the only key to fully understanding the failure processes, especially in regions where extreme events are not exceptional. In these cases, failures sometimes occur in conjunction with rainfall whose features (intensity and duration) are not the most severe ones recorded for the particular area. In this context, establishing a warning system based on rainfall intensity and duration could be inappropriate. Considering the previous drying and wetting cycles which involved the soils is of crucial importance. In this context WANDLAND focused on the geomechanical impact of wetting and drying cycles in shallow landslides activity. Three main components were considered and addressed in this project, namely: A. Improvement of the constitute analysis of natural soil geomechanical behaviour associated with wetting/drying cycles; B. Development of advanced experimental setup to quantify the mechanical response of natural soils under variations of their degree of saturation (or suction); C. Advanced numerical modelling of rainfall induced landslides for an improved understanding of the triggering mechanisms and the establishment of early warning systems.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
The project aims to improve the capabilities to predict the occurrence of landslide crisis episodes. The research activities focus on the changes in the stability conditions of natural slopes when subjected to wet/dry cycling. Soil properties can undergo strong modifications as a consequence of cyclic variations in the degree of saturation, which can lead to a reduction of the available shearing resistance in the long term. The project involves three main research activities. The first phase deals with study of the evolution of natural soil fabrics as a consequence of imposed weathering processes; modern technologies will be applied to analyse those changes at a microscopic level. This analysis is expected to provide a better understanding of the involved physical processes. During the second phase, the effects of cyclic wetting and drying episodes on natural soil samples will be quantified at a macroscale by an extensive laboratory testing programme. The experimental programme involves the use of advanced testing facilities, available at the host institute, which are necessary to control the pore water pressure of the soil in unsaturated states. A new apparatus will also be developed to measure the shearing resistance of the soil after imposing cyclic changes in the degree of saturation using controlled suction. In the third phase, the results from the experimental work will be used to validate a constitutive model for unsaturated soils. This model will take into account the effects of the changes in the degree of saturation on the mechanical response. Finally, the model will be used in a finite element framework to simulate and forecast the behaviours in selected case studies.
Оригинален текст от CORDIS (на английски).
Участници
- ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE · LausanneКоординаторШвейцария
Връзки
Данни: CORDIS, © Европейски съюз