沧州市地下水开采-地面沉降数值模拟

以沧州市地下水开采引起的地面沉降为例,在分析研究区地质和水文地质条件的基础上,得到研究区地下水开采与地面沉降地质概化模型,建立地下水三维渗流和土体垂向一维变形耦合数值模型,在完成模型识别验证的基础上,预测了现状开采条件下从2010年末到2025年末地下水流场的变化特征和地面沉降的变化趋势。结果表明,到2025年底,整个沧州市范围内累计地面沉降量最大值为475 mm,最小值为270 mm。

Numerical simulation of groundwater exploitation and land subsidence in Cangzhou City

Taking the land subsidence caused by groundwater exploitation in Cangzhou City as an example, based on the analysis of geology and hydrogeological conditions of the study area, a geological conceptual model of groundwater exploitation and land subsidence was generalized, setting up a corresponding coupled numerical model of three dimensional groundwater flow and one dimensional soil deformation. On the basis of the completion of identification and verification of model, we forecasted the change characteristics of groundwater flow field and the change trend of land subsidence from the end of 2025 to the end of 2010 under the current conditions of groundwater exploitation. The results show that the maximum cumulative land subsidence within the scope of Cangzhou City will be 475 mm at the end of 2025, the minimum value being 270 mm.