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针对第四系松散沉积层地下水开采所引起的地面沉降,根据渗流理论和土力学理论,建立了地下水三维非稳定渗流与地面沉降耦合数学模型。采用三维有限差分方法,以南通市地下水开采为例,基于地面沉降的控制要求,规划评价出了各乡镇各含水层的地下水可采资源量。结果表明:地下水开采布局科学规划后,总的可采资源量为24281.4×104m3/a,为南通市合理开采地下水以及地面沉降的防治提供了科学的依据。
According to the seepage theory and soil mechanics theory, a mathematical model of three-dimensional groundwater seepage and ground subsidence coupled with ground subsidence caused by groundwater drainage in Quaternary loose sediments is established. Taking three-dimensional finite difference method and groundwater exploitation in Nantong City as an example, the recoverable groundwater resource of each aquifer in each township was evaluated based on the control requirements of ground subsidence. The results show that the total recoverable resources amount to 24281.4 × 104m3 / a after the scientific planning of groundwater exploitation layout, which provides a scientific basis for the reasonable exploitation of groundwater and prevention and control of land subsidence in Nantong City.