The influence of overburden pressure on liquefaction potential

Abstract

One of the important design considerations for structures situated on sand deposits is the potential for instability caused by the development of excess pore water pressure as a result of earthquake loading. A build-up of excess pore water pressure may lead to initial liquefaction. In this paper, to examine the influence of overburden pressure on liquefaction potential, equivalent loads of several buildings with various stories were loaded on a sandy soil deposit using the FLAC program. The pore water pressure ratio ru was defined for the program by a Fish function. Analyses showed that by increasing the applied loading due to building construction, the values of effective stress and shear stress in the soil mass increased, and this generally can be a factor to influence liquefaction potential. Furthermore, dynamic analyses showed that there was a shallow longitudinal area beneath tall buildings in which liquefaction potential increased due to stress concentration and high confining effective stress; generally, they can be named as the factors to increase liquefaction potential.

An Investigation of Soil Void Ratio Effect on Liquid Limit Values Determined by Different Test Methods

“…Liquefaction of soils is a phenomenon whereby a soil and water mix loses its strength in response to an applied shear stress [24][25][26]. In case of a compact soil, strength loss is harder in comparison with the case of a loose soil having a relatively high void ratio.…”

Estudio dinámico de cimentaciones en obras portuarias

“…También Moradi et al (2015) han utilizado el programa FLAC con para estudiar el comportamiento de un aluvial compuesto por arena en condiciones saturadas. Y también la generación de presiones intersticiales es realizada mediante el modelo Finn (1977).…”