承压含水层非达西变速抽水井流模型研究  

Model investigation of non-Darcian flow by variable-ratepumping tests in confined aquifers

作　　者：肖良 宗一杰[1,2,3] 甘富万 陈立华[1,2,3] XIAO Liang;ZONG Yijie;GAN Fuwan;CHEN Lihua(School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西防灾减灾与工程安全重点实验室,广西南宁530004 [3]工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2023年第2期320-329,共10页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金项目(41807197);广西自然科学基金项目(2018GXNSFAA138042)

摘　　要：为了精确预测地下水流动中由变速抽水引起非达西流的情况,提出了一个考虑了井储效应和表皮效应的新数值模型。该数值解是利用有限差分法和叠加原理推导得出的,并使用了Izbash方程去描述非达西流的非线性特征。进一步研究中,得到了表皮效应对承压含水层抽水降深的影响。结果表明,表皮区域内的降深曲线会明显受到表皮效应的影响。表皮区域的准渗透率和非达西系数与对应降深呈现负相关关系,并且当表皮区域的径向距离增加时,表皮效应也随之增强。在重点考虑大口径抽水井附近工况时,表皮效应的影响是不可忽略的。In order to obtain a precise prediction for groundwater in non-Darcian flow induced by variable-rate pumping tests,this study develops a numerical model considered skin effect and wellbore storage effect.The finite difference and superposition principle are used to propose numerical solution and the nonlinear characters of the non-Darcian flow has been depicted by the Izbash equation.The skin effect for pumping drawdown in a confined aquifer has been obtained by further investigation.The results suggest that the drawdown in the skin region is distinctly changed by the skin effect.There are negative relationships between quasi-hydraulic conductivity and non-Darcian index of skin region and the drawdown simulation.It is worth mentioning that as the radial distances of skin region is larger,skin effect is stronger.The influence of skin effect should not be ignored in practice in case of considering the use of large diameter well.

关 键 词：非达西流 变速抽水 表皮效应 井储效应 有限差分法 

分 类 号：TV139.1[水利工程—水力学及河流动力学]