论文部分内容阅读
利用降深-时间曲线计算水文地质参数的基础是地下水向井运动及泰斯(Theis)假设。然而由于抽水试验延续时间较长,水流场不仅受边界条件影响,还受含水层的非均质性影响,从而导致在某些抽水时间区段内,地下水流难于满足向井运动假设。利用微分分析方法,可清晰划分出降深-时间曲线中符合向井运动的时间区段,并根据分析结果选取合理的井流模型,进行有效的参数计算。实际应用表明,基于抽水试验的微分分析,整合了更多的地质信息,确定了边界条件及含水层非均质性对抽水试验的影响,为计算合理的水文地质参数,提供了有利的技术支持。
The basis for calculating hydrogeological parameters using the drawdown-time curve is the groundwater movement to the well and the Theis assumption. However, due to the prolonged pumping test, the water flow field is not only affected by the boundary conditions, but also affected by the heterogeneity of the aquifer, which makes it difficult for groundwater flow to meet the well movement assumptions in some pumping time periods. Using the differential analysis method, time segments that accord with the well movement can be clearly divided, and a reasonable well flow model is selected according to the analysis results to calculate the effective parameters. The practical application shows that based on the differential analysis of pumping tests, more geological information is integrated, the influence of boundary conditions and aquifer heterogeneity on pumping tests is confirmed, and favorable technical support is provided for calculating reasonable hydrogeological parameters .