As green air conditioning systems, groundwater heat pump systems have been popularized and applied because of their stability and high heat exchange efficiency. However, the low-efficiency recharge caused by clogging restricts the healthy and orderly development of such systems. Physical clogging, accounting for 50% of the total clogging, arises from solid particle accumulation and is the most common type of clogging. In this study, a physical simulation sandbox bench was constructed to simulate groundwater recharge. Tests were conducted under two initial injection pressures of 17.058 kPa and 13.8 kPa and solid matrix particle gradations of 1.026 mm, 1.343 mm, and 1.721 mm to study the migration-deposition of exogenous particles near the injection well induced by groundwater recharging as well as to select suitable downhole filter grades. The results show that when the initial injection pressure and solid matrix particle gradation were low, suspended particles were more susceptible to be sieved and deposited within 24 cm from the injection well. This significantly reduced the permeability and resulted in a rise in the injection pressure. When the high injection pressure of 17.058 kPa was applied, the area in which the permeability coefficient decreases by an order of magnitude compared to the initial value, was less than 10 cm of the wellbore wall, and the quantity of outflow of particles accounted for 34.8% of the inflow. The size range of the suspended particles flowing through the porous medium was 3–30 μm, providing the parameter basis for downhole filter grade selection. This research provides useful insights into the design and optimization of injection projects to prevent particle clogging in groundwater heat pump systems.

作为绿色空调系统，地下水热泵系统因其稳定性和高热交换效率而得到广泛应用。但是，由于堵塞导致的低效率充电限制了此类系统的健康和有序开发。物理堵塞占总堵塞的50％，是由于固体颗粒积聚引起的，是最常见的堵塞类型。在这项研究中，建立了一个物理模拟沙箱工作台来模拟地下水补给。在两个初始注入压力分别为17.058 kPa和13.8 kPa以及固体基质颗粒等级为1.026 mm，1.343 mm和1.721 mm的条件下进行测试，以研究地下水补给和注入过程中外源颗粒在注入井附近的迁移沉积。选择合适的井下过滤器等级。结果表明，当初始注入压力和固体基质颗粒等级较低时，悬浮颗粒更容易被筛分并沉积在距注入井24 cm的范围内。这显着降低了渗透率，并导致注射压力升高。当施加17.058 kPa的高注入压力时，渗透系数与初始值相比下降一个数量级的区域小于井眼壁的10 cm，并且颗粒的流出量占34.8。流入量的百分比。流经多孔介质的悬浮颗粒的尺寸范围为3–30μm，这为井下过滤器等级的选择提供了参数基础。