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

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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.

Original languageEnglish
Pages (from-to)375-379
Number of pages5
JournalProceedings of the International Association of Hydrological Sciences
Volume382
DOIs
Publication statusPublished - 2020 Apr 22
Event10th International Symposium on Land Subsidence, TISOLS 2020 - Delft, Netherlands
Duration: 2021 May 172021 May 21

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

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