Prediction of Ground Subsidence Induced by Groundwater Mining Using Three-Dimensional Variable-Parameter Fully Coupled Simulation

Author:

Du Jingjing1,Zhang Yan23,Luo Zujiang4,Zhang Chenghang5ORCID

Affiliation:

1. Nanjing Geological Survey Center, China Geological Survey, Nanjing 210016, China

2. Geological Survey of Jiangsu Province, Nanjing 210018, China

3. Key Laboratory of Earth Fissures Geological Disaster, Ministry of Natural Resources, Nanjing 210000, China

4. School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China

5. School of Earth Science and Engineering, Sun Yat-sen University, Zhuhai 519082, China

Abstract

In order to predict the ground settlement in a scientific, intuitive, and simple way, based on the theory of Bio-consolidation, a three-dimensional fluid-solid coupled numerical calculation programme FGS-3D for ground settlement was compiled by using the Fortran 95 language, and a front-end operation platform was developed by using Microsoft VisualBasic, so that a three-dimensional variable-parameter fully coupled viscoelastic-plastic model of ground settlement was constructed using the city of Yancheng as an example, and the development of ground settlement and horizontal displacement changes from 2021 to 2030 were predicted. The results show that the three-dimensional fully coupled finite-element numerical model of building load, groundwater seepage, and soil deformation established by the above computer development program can directly create a hydrogeological conceptual model of groundwater mining and predict ground settlement, so as to achieve the visualisation of the three-dimensional seepage of groundwater and the fully coupled simulation of ground subsidence in the whole process of groundwater mining. Under the joint action of construction load and groundwater mining, the water level of the aquifer in Yancheng City rises by 1.26 m on average in the main groundwater mining area of the group III pressurised aquifer, forming two smaller landing funnels, and the lowest water level of the two landing funnels is −15 m.

Funder

Key Laboratory of Earth Fissures Geological Disaster, Ministry of Natural Resources, China

Publisher

MDPI AG

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