Land subsidence due to groundwater pumping and recharge: considering the particle-deposition effect in ground-source heat-pump engineering

Cui, Xianze; Liu, Quansheng; Zhang, Chengyuan; Huang, Yisheng; Fan, Yong; Wang, Hongxing

Land subsidence due to groundwater pumping and recharge: considering the particle-deposition effect in ground-source heat-pump engineering | Subsidence due au pompage et à la recharge des eaux souterraines: incidence de l’effet des dépôts de particules dans l’ingénierie des pompes à chaleur Subsidencia del terreno debido al bombeo y recarga de agua subterránea: considerando el efecto de depositación de partículas en la ingeniería de bombas de calor de fuente terrestre 地下水抽采对地面沉降的影响:以考虑颗粒沉积效应的地下水源热泵工程为例 Subsidência da terreno devido ao bombeamento e recarga das águas subterrâneas: considerando o efeito de deposição de partículas na engenharia de bomba de calor terrestre

2018

With the rapid development and use of ground-source heat-pump (GSHP) systems in China, it has become imperative to research the effects of associated long-term pumping and recharge processes on ground deformation. During groundwater GSHP operation, small particles can be transported and deposited, or they can become detached in the grain skeleton and undergo recombination, possibly causing a change in the ground structure and characteristics. This paper presents a mathematical ground-deformation model that considers particle transportation and deposition in porous media based on the geological characteristics of a dual-structure stratum in Wuhan, eastern China. Thermal effects were taken into consideration because the GSHP technology used involves a device that uses heat from a shallow layer of the ground. The results reveal that particle deposition during the long-term pumping and recharge process has had an impact on ground deformation that has significantly increased over time. In addition, there is a strong correlation between the deformation change (%) and the amount of particle deposition. The position of the maximum deformation change is also the location where most of the particles are deposited, with the deformation change being as high as 43.3%. The analyses also show that flow of groundwater can have an effect on the ground deformation process, but the effect is very weak.

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