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粒径变化对悬浮颗粒在多孔介质中迁移—沉积过程影响的研究有重要意义。利用自主研发的砂层迁移—沉积模拟试验系统,研究不同粒径的悬浮颗粒在不同尺寸多孔介质中的迁移—沉积特性。结果表明,对于相同尺寸的多孔介质,随着悬浮颗粒粒径的增加,到达相对浓度峰值时间增加,而对应的相对浓度峰值降低;同时,对于相同粒径的悬浮颗粒,随着多孔介质尺寸增大,相对浓度峰值增加;另外,相对于多孔介质,悬浮颗粒粒径的变化对其迁移—沉积过程影响更为显著;随着多孔介质与悬浮颗粒粒径比增大,相对浓度的峰值和终值增大;根据粒径比不同将悬浮颗粒在多孔介质中的迁移—沉积类型划分为“滤饼过滤型”、“迁移—沉积型”、“自由迁移型”3种。研究结果为水源热泵回灌过程中悬浮颗粒在地层中的迁移—沉积特性进一步研究奠定了基础。
The study on the influence of particle size on the migration-deposition process of suspended particles in porous media is of great significance. Using self-developed sand migration-deposition simulation test system, the migration-sedimentation characteristics of different particle sizes of suspended particles in porous media with different sizes were studied. The results show that for the same size of porous media, with the increase of particle size of suspended particles, the peak of relative concentration reaches the peak value and the corresponding peak of relative concentration decreases. Meanwhile, with the same particle size of suspended particles, with the increase of porous media size In addition, compared with porous media, the change of particle size of suspended particles has a more significant effect on the migration-deposition process. With the increase of particle size ratio of porous media and suspended particles, the peak of relative concentration and the end The value of migration-sediment types of suspended particles in porous media is divided into three types: “filter cake filtration type”, “migration-sedimentation type” and “free migration type” . The results laid the foundation for the further study on the sedimentation characteristics of suspended particles in the groundwater during the heat pump water recharge.