本研究基于“地下水超采导致深部含水层砷富集”现象，将传统高砷地下水成因的研究对象由浅部含水层拓展到深部弱透水层和相邻深部含水层，提出“地下水超采导致深部弱透水层压实释砷并进入相邻深部含水层”的科学假设，针对“弱透水层压实过程中砷的迁移释放过程及其机制”这一关键科学问题，以室内压实模拟为核心手段，运用自主研发的不同温压条件下多过程在线监测的一体化土柱模拟装置，查明弱透水层压实过程中砷的释放规律及其主控因素（压力、含水率、Fe和S含量、有机质、压实模式等），揭示弱透水层压实过程中砷的迁移释放机制论支撑。

Based on the phenomenon that groundwater overpumping leads to an increase in deep aquifer arsenic concentrations, the present study, extended the research object of the origin of high arsenic groundwater from shallow aquifer to deep aquiatrd and aquifer, proposed the scientific hypothesis that the overpumping of groundwater results in arsenic release during deep clayey aquitard compaction and enter the adjacent deep aquifer. Aiming at the scientific problem of process and mechanism of arsenic migration and release during clayey aquitard compaction, this research will find out the characteristics and main control factors(such as pressure, moisture content, content of Fe and S, organic matter and compaction mode) of arsenic release during aquitard compaction, by taking indoor compaction simulation as key technology and using multi-process online monitoring soil column simulation device under different temperature and pressure conditions. The research will reveal the mechanism of arsenic migration and release during clayey aquitard compaction, and quantitatively evaluate the contribution of clayey aquitard compaction to arsenic enrichment in adjacent aquifer. The present study can further enrich genetic theory of high arsenic groundwater, and provide theoretical support for the safety management of groundwater quality in the groundwater overpumping area.