地下水源热泵定压差取水方式对含水层渗透性的影响

Influence of constant pressure difference on aquifer permeability induced by groundwater source heat pump pumping

针对地下水源热泵取水引起含水层颗粒迁移问题建立数学模型,并通过案例计算分析地下水源热泵定压差取水方式对含水层渗透性的影响。研究结果表明,地下水源热泵运行5 a后含水层厚度为20,25和30 m时的孔隙率依次增大到初始值的2.57,1.86和1.59倍,渗透系数依次增大到初始值的156,16和7倍;考虑颗粒迁移时,地下水源热泵定压差取水方式对含水层渗透性影响显著。

The mathematic model of aquifer particles migration induced by groundwater source heat pump（GWSHP） pumping was theoretically presented.A case which represents the influence of constant pressure difference on aquifer permeability induced by GWSHP pumping was analysed.The results indicate that the hydraulic conductivity increases by 156,16 and 7 times respectively as aquifer porosity increases 2.57,1.86 and 1.59 times respectively of initial value 20,25 and 30 m in five-year operation of GWSHP for different aquifer thicknesses.Considering particles migration,the permeability of aquifer is affected obviously by GWSHP pumping under constant pressure difference.