The Experts below are selected from a list of 2445 Experts worldwide ranked by ideXlab platform
Ferri Hassani - One of the best experts on this subject based on the ideXlab platform.
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Safety Factor on Rock Slopes with Tensile Cracks Using Numerical and Limit Equilibrium Models
Geotechnical and Geological Engineering, 2020Co-Authors: Norly Belandria, Roberto Úcar, Alfredo Corredor, Ferri HassaniAbstract:Through the research it describes an analytic methodology, which allows to determine the minimum safety factor depending on the depth of tensile crack and the inclination of surface failure on the most critical condition, considering at the same time, surcharge, seismic effect and water pressure. Therefore, it studies the stability of rock slopes considering that the potential of failure surface it is constituted by two blocks with different inclinations. The superior block is limited by a tensile crack that is represented by a fracture without displacement. On the other hand, on the inferior block, geometry is formed by a potential Slide Plane of α inclination with the horizontal axis, in which are acting shear stresses. Fracture on superior block is characterized by a normal-tensile stresses field that act over the crack whose presence originates when the rock loses its original cohesion. Finally, comparisons are made through examples with the limit equilibrium method and finite elements method, where it determines the safety factor on dry state, water and seism, being all of them too similar. Besides, the methodology compares the track depth and the distance between the intersection point of tensile crack and the edge of the slope face, results shows that the analytic methodology is very conservative and throws the less values of this distances.
Norly Belandria - One of the best experts on this subject based on the ideXlab platform.
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Safety Factor on Rock Slopes with Tensile Cracks Using Numerical and Limit Equilibrium Models
Geotechnical and Geological Engineering, 2020Co-Authors: Norly Belandria, Roberto Úcar, Alfredo Corredor, Ferri HassaniAbstract:Through the research it describes an analytic methodology, which allows to determine the minimum safety factor depending on the depth of tensile crack and the inclination of surface failure on the most critical condition, considering at the same time, surcharge, seismic effect and water pressure. Therefore, it studies the stability of rock slopes considering that the potential of failure surface it is constituted by two blocks with different inclinations. The superior block is limited by a tensile crack that is represented by a fracture without displacement. On the other hand, on the inferior block, geometry is formed by a potential Slide Plane of α inclination with the horizontal axis, in which are acting shear stresses. Fracture on superior block is characterized by a normal-tensile stresses field that act over the crack whose presence originates when the rock loses its original cohesion. Finally, comparisons are made through examples with the limit equilibrium method and finite elements method, where it determines the safety factor on dry state, water and seism, being all of them too similar. Besides, the methodology compares the track depth and the distance between the intersection point of tensile crack and the edge of the slope face, results shows that the analytic methodology is very conservative and throws the less values of this distances.
Alessandro Tibaldi - One of the best experts on this subject based on the ideXlab platform.
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Multiple sector collapses at stromboli volcano, Italy: how they work
Bulletin of Volcanology, 2001Co-Authors: Alessandro TibaldiAbstract:This paper demonstrates that four large sector collapses have affected the NW flank of the Stromboli volcano in the past 13 ka, alternating with growth phases, in order to contribute to the evaluation of the critical conditions which trigger lateral collapses, a reconstruction of the geometry of each collapse of the volcano edifice in the four stages that preceded the relative collapse events is also presented, and a computation of the landSlide volume. This reconstruction is based on new field data plotted in three dimensions. Prior to the initial 13-ka collapse, the volcano was 1125±100 m high above sea level. The collapse had a volume of 2.23±0.87 km^3, whereas the pre-collapse volcano volume was 218.8±7.7 km^3. The next edifice that failed was 900±70 m high a.s.l. The collapse volume was 1±0.54 km^3, with a precollapse volcano volume of 201.4±5.4 km^3. The edifice then grew to 1000±60 m a.s.l. The third collapse had a volume of 1.08±0.39 km^3 and occurred within a volcano with a volume of 209.1±4.6 km^3. This was followed by a new growth phase followed by the last collapse with a volume of 0.73±0.22 km^3. The volcano volume was about the same as the present one. The present active crater zone is at 780 m a.s.l. in the first three collapses, sliding surfaces cut the main magma conduit. In the last collapse, the upper scarp coincided with the conduit location. Dyking along a main NE-trending weakness zone across the volcano summit exerted a lateral force for collapse inception. The decrease of the landSlide volumes with the age, and the concentric scarps of the four collapses, suggest that the younger sliding Planes tended to become more superficial and to decrease the areal extent. This is interpreted as due to: (a) successively weaker eruptive products from dominantly lavas to dominantly pyroclastics; and (b) the feedback effects between collapses and dykes that injected along the lateral segments of the first collapse Slide Plane.
Alfredo Corredor - One of the best experts on this subject based on the ideXlab platform.
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Safety Factor on Rock Slopes with Tensile Cracks Using Numerical and Limit Equilibrium Models
Geotechnical and Geological Engineering, 2020Co-Authors: Norly Belandria, Roberto Úcar, Alfredo Corredor, Ferri HassaniAbstract:Through the research it describes an analytic methodology, which allows to determine the minimum safety factor depending on the depth of tensile crack and the inclination of surface failure on the most critical condition, considering at the same time, surcharge, seismic effect and water pressure. Therefore, it studies the stability of rock slopes considering that the potential of failure surface it is constituted by two blocks with different inclinations. The superior block is limited by a tensile crack that is represented by a fracture without displacement. On the other hand, on the inferior block, geometry is formed by a potential Slide Plane of α inclination with the horizontal axis, in which are acting shear stresses. Fracture on superior block is characterized by a normal-tensile stresses field that act over the crack whose presence originates when the rock loses its original cohesion. Finally, comparisons are made through examples with the limit equilibrium method and finite elements method, where it determines the safety factor on dry state, water and seism, being all of them too similar. Besides, the methodology compares the track depth and the distance between the intersection point of tensile crack and the edge of the slope face, results shows that the analytic methodology is very conservative and throws the less values of this distances.
Roberto Úcar - One of the best experts on this subject based on the ideXlab platform.
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Safety Factor on Rock Slopes with Tensile Cracks Using Numerical and Limit Equilibrium Models
Geotechnical and Geological Engineering, 2020Co-Authors: Norly Belandria, Roberto Úcar, Alfredo Corredor, Ferri HassaniAbstract:Through the research it describes an analytic methodology, which allows to determine the minimum safety factor depending on the depth of tensile crack and the inclination of surface failure on the most critical condition, considering at the same time, surcharge, seismic effect and water pressure. Therefore, it studies the stability of rock slopes considering that the potential of failure surface it is constituted by two blocks with different inclinations. The superior block is limited by a tensile crack that is represented by a fracture without displacement. On the other hand, on the inferior block, geometry is formed by a potential Slide Plane of α inclination with the horizontal axis, in which are acting shear stresses. Fracture on superior block is characterized by a normal-tensile stresses field that act over the crack whose presence originates when the rock loses its original cohesion. Finally, comparisons are made through examples with the limit equilibrium method and finite elements method, where it determines the safety factor on dry state, water and seism, being all of them too similar. Besides, the methodology compares the track depth and the distance between the intersection point of tensile crack and the edge of the slope face, results shows that the analytic methodology is very conservative and throws the less values of this distances.