Influence of pore water pressure change on consolidation behavior of saturated poroelastic medium

Abstract

There are many factors causing land subsidence, and groundwater extraction is one of the most important causes of subsidence. A set of coupled partial differential equations are derived in this study by using the poro-elasticity theory and linear stress-strain constitutive relation to describe the one-dimensional consolidation in a saturated porous medium subjected to pore water pressure change due to groundwater table depression. Simultaneously, the closed-form analytical solutions for excess pore water pressure and total settlement are obtained. To illustrate the consolidation behavior of the poroelastic medium, the saturated layer of clay sandwiched between two sand layers is simulated, and the dimensionless pore water pressure changes with depths and the dimensionless total settlement as function of time in the clay layer are examined. The results show that the greater the water level change in the upper and lower sand layers, the greater the pore water pressure change and the total settlement of the clay layer, and the more time it takes to reach the steady state. If the amount of groundwater replenishment is increased, the soil layer will rebound.

Correlación en Costos De Un Diseño De Una Cimentación Superficial Rígida Y Flexible Considerando La Consolidación Unidimensional

“…La oscilación del nivel freático induce variaciones en la presión de poros del suelo (Molina Gómez, Bulla Cruz, Moreno Anselmi, Ruge, & Arévalo Daza, 2019) , convirtiéndose en una variable de gran interés dada su alta incidencia en el fenómeno de asentamientos de las estructuras (Costa, Kok, & Korff, 2020). Si el nivel freático disminuye podría originar la consolidación del terreno generando fracturas y produciendo compresibilidad, porque el agua es expulsada de la masa de suelo ocasionando la disminución del volumen de los vacíos generando esfuerzos verticales y horizontales, éstas variaciones por compresibilidad y el fracturamiento por deformación diferencial es causado por la heterogeneidad mineralógica del material arcilloso (Yeh, Lo, Lin, & Ding, 2020). REV.…”