Physics And Mechanics Of Soil Liquefaction Pdf
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Open Engineering publishes research results of wide interest in emerging interdisciplinary and traditional engineering fields, including:. The journal is designed to facilitate the exchange of innovative and interdisciplinary ideas between researchers from different countries. Open Engineering is a peer-reviewed, English language journal.
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A discrete element method DEM implementation is developed to study the micromechanics of liquefaction in granular materials. In a liquefaction event, the pore water acts as a cushion between the grains, reducing the contact and friction forces and the overall soil strength. The DEM particles will suffer resistance to any displacement changing the pore volume, which takes into account the very small compressibility of water. It is found that this constraint is enough to simulate soil liquefaction under quasistatic deformation. Finally, it is shown that the initial density of the granular skeleton, defined by the number of contacts between grains, plays a critical role in determining if the soil will liquefy or not. This critical value opens the possibility of treating liquefaction in soils as a bifurcation problem. Zhang 1 , and K.
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This article focuses on liquefaction of saturated granular soils, triggered by earthquakes. Liquefaction is defined here as the transition from a rigid state, in which the granular soil layer supports structures placed on its surface, to a fluidlike state, in which structures placed initially on the surface sink to their isostatic depth within the granular layer. We suggest a simple theoretical model for soil liquefaction and show that buoyancy caused by the presence of water inside a granular medium has a dramatic influence on the stability of an intruder resting at the surface of the medium. We confirm this hypothesis by comparison with laboratory experiments and discrete-element numerical simulations. The external excitation representing ground motion during earthquakes is simulated via horizontal sinusoidal oscillations of controlled frequency and amplitude. In the experiments, we use particles only slightly denser than water, which as predicted theoretically increases the effect of liquefaction and allows clear depth-of-sinking measurements. In the simulations, a micromechanical model simulates grains using molecular dynamics with friction between neighbors.
A t a. As thousands of people in the adjoining San Fernando Valley put down their morning cups of coffee and braced themselves against the shaking, a far more ominous phenomenon was taking place inside the Lower San Fernando Dam at the head of the valley. A layer of soil at the base of the earthen dam suddenly lost strength and slipped sideways as the embankment began to break apart. By the time the shaking stopped, a wall of broken earth just 5 feet tall stood between 15 million tons of water and what would have been one of the greatest dam disasters in U. Geological and geotechnical investigations revealed that the soil at the base of the dam failed due to earthquake-induced liquefaction, a phenomenon that was just starting to be understood at the time. Liquefaction can wreak havoc.
The paper deals with the mechanics of sand with some admixtures of fines. The basic question is whether such admixtures are liquefiable or not. Experimental results show that admixtures of fines do not essentially influence the liquefaction susceptibility of granular soils. The original experimental investigations support this conclusion. Chu J. Garga V.
A discrete element method DEM implementation is developed to study the micromechanics of liquefaction in granular materials. In a liquefaction event, the pore water acts as a cushion between the grains, reducing the contact and friction forces and the overall soil strength. The DEM particles will suffer resistance to any displacement changing the pore volume, which takes into account the very small compressibility of water. It is found that this constraint is enough to simulate soil liquefaction under quasistatic deformation.
A simple model describing the pore pressure generation in saturated sands and subsequent liquefaction is briefly outlined. Some applications of this model, dealing with an earthquake induced liquefaction of a soil stratum, propagation of a uni-axial liquefaction wave and liquefaction induced by surface waves are discussed. Unable to display preview.
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