Three-dimensional numerical simulation of fully coupled groundwater flow and land deformation in unsaturated true anisotropic aquifers due to groundwater pumping

2005 ◽  
Vol 41 (1) ◽  
Author(s):  
Jun-Mo Kim
Keyword(s):  
Numerical Simulation ◽  
Groundwater Flow ◽  
Three Dimensional ◽  
Groundwater Pumping ◽  
Land Deformation ◽  
Fully Coupled

scholarly journals Three-dimensional fully coupled study of groundwater seepage and soil deformation under the action of cyclic pumping and recharge

2020 ◽  
Vol 382 ◽  
pp. 515-520
Author(s):  
Zujiang Luo ◽  
Di Ning ◽  
Zhao Li ◽  
Xiaowei Tian
Keyword(s):  
Water Level ◽  
Land Subsidence ◽  
Three Dimensional ◽  
Hydraulic Parameters ◽  
Mechanical Parameters ◽  
Level Fluctuation ◽  
Soil Deformation ◽  
Groundwater Pumping ◽  
Groundwater Seepage ◽  
Fully Coupled

Abstract. This study was undertaken in order to accurately analyze the land subsidence that is caused by the change in the seepage and stress fields during the pumping and recharge of groundwater. Based on Biot's consolidation theory and groundwater seepage theory (combined with theory regarding the nonlinear rheology of soil), the constitutive relationship of soil was extended to viscoelastic plastic; concurrently, considering the dynamic changes in hydraulic parameters and soil mechanical parameters, a three-dimensional fully coupled model of groundwater seepage and soil deformation was established. Using the groundwater recycling pumping and recharge test conducted by Land Subsidence Monitoring and Early Warning Center in Cangzhou City as an example, the site was divided into four loose porous aquifers. A constantly circulating pumping–recharge flow was simulated numerically, and numerical simulation was carried out on the third and fourth confined aquifers. The influence of groundwater seepage on soil deformation was analyzed, and the variation in hydraulic parameters and soil mechanical parameters were studied under the influence of the abovementioned cyclic pumping and recharge. The results show that soil deformation lags behind the change in the groundwater level, and that permanent residual deformation of soil is produced by water level fluctuations during groundwater pumping–recharge cycles. The effective porosity, the permeability coefficient and the Poisson ratio are positively correlated with the water level fluctuation in groundwater pumping–recharge cycles, whereas the modulus of deformation is negatively correlated with the water level fluctuation in groundwater during this process. All parameters change, and this change is permanent. The simulated results are in good agreement with the measured values.

Numerical Simulation of Groundwater Flow in Strata with Argillation Weak Permeable Media in Long Deep Buried Tunnel Site

2014 ◽  
Vol 670-671 ◽  
pp. 674-677
Author(s):  
Ying Er Deng ◽  
Xin Peng ◽  
Huan Huan Jiang
Keyword(s):  
Numerical Simulation ◽  
Groundwater Flow ◽  
Conceptual Model ◽  
Water Pressure ◽  
Three Dimensional ◽  
High Water ◽  
Scientific Basis ◽  
Tunnel Construction ◽  
Prevention Measures ◽  
Permeable Media

This paper focused on groundwater flow in certain a tunnel site under conditions of high ground stress and high water pressure (referred to as “two high conditions”). Three-dimensional conceptual model was established for groundwater flow in porous strata with argillation weak permeable media in a long deep buried tunnel site. Groundwater flow field was studied by means of three-dimensional numerical simulation. Results show that there is good agreement between numerical simulated and observed groundwater table and that the conceptual model and the numerical simulation are reliable. Prevention measures should be adopted for a long deep buried tunnel construction. The results can provide evaluation of engineering safety of a long deep buried tunnel construction with scientific basis.

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