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- 저자 : ( Leticia Moniz ) (검색결과 2 건)
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( Leticia Moniz ),( Paulo Amaral ),( Filipe Marques ),( Ana Maria Malheiro ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The present work is presently being carried out at Lajedo parish, located southwest on Flores Island (Azores archipelago), a place where a series of landslides with slow kinematic characteristics have been observed, some of which put at risk people and property. In November of 2016, a hydrological and geotechnical monitoring network was installed at three landslides (#L1, #L2 and #L3), using vibrating wire and standpipe piezometers, tiltmeters, inclinometers and a rainfall station. Based on the acquired data in the last 3 years at Lajedo parish, and the physical and mechanical characterization of the deposits, through laboratory tests, it was possible to carry out a slope stability analysis to evaluation the stability conditions and the propensity for new instability situations based on limit equilibrium methods. Beside this, one of the monitored landslide (e.g., #L2) was investigated by modelling the ground water infiltration process and pore water pressure variations using a finite element seepage analysis. The effects of these variations were the input to compute the slope stability analyses over the time in order to analyse the factors that promoted slope instability. This study is part of a research project known as Decisionlarm, whose main objective is to develop a multi-technical monitoring system to support decision-making based on alert and alarm levels in the unstable zone by evaluating the effect of precipitation and the oscillations of water level in the potential failure planes capable of triggering landslides.
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Definition of a Methodology for an Expedited Assessment of Slope Instability on Volcanic Terrains
( Ana Maria Malheiro ),( Luis Teixeira ),( Paulo Amaral ),( Filipe Marques ),( Jose Vieira ),( Leticia Moniz ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
A project called MACASTAB (co-financed by the Interreg Mac 2014-20 program) is being developed, by a group of technicians from the Canarias, Azores, Madeira and Cabo Verde archipelagos. This project aims to prepare a methodological guide for the natural risk management produced by the instability of volcanic slopes and talus in Macaronesia archipelagos. One of its tasks is the development of charts that can be applied in the referred archipelagos in order to do an expeditious evaluation of slope stability. Given the specificities of the geology of the Azores and Madeira islands, the charts were supported by limit equilibrium analysis methods (e.g. Morgenstern-Price) applied to slopes whose constitution is predominantly formed by soils (an unusual situation in other archipelagos that are in the project). Results of shear strength parameters obtained for volcanic soils on both archipelagos by triaxial compression tests and direct shear tests are presented. Empirical correlation between friction angle and particle size distribution was found with a coefficient of adjustment of 93%. That correlation shows a relationship between the angle of internal friction of a given material and the percentage of gravel and sand. For the preparation of these charts, several stability analyzes were performed with different scenarios (slope gradient and heights, and shear strength parameters), in order to determine the safety factor of slopes in a simple and fast way in the field.
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