苏晨,陈宗宇*,陈江,费宇红,陈京生,段宝谦
Abstract
The deformation of aquitard is the main
contribution to land subsidence in the North China Plain, and the water
released from aquitard compaction may be a large portion of the exploited
groundwater. In this study, the consolidation test was employed to understand
the mechanics on the drainage and deformation of aquitard. The results
suggested the strain of aquitard mainly resulted from the difference of
hydraulic head between aquifers. And it was decreased with depth of aquitard at
the same hydrodynamic pressure. In contrast with the interbed within aquifers,
the aquitard was deformable when it was compressed. The weakly bound water was
significantly released when the void ratio was about 0.44–0.45, and the EC of
water released from the aquitard was decreased with the compacting process. The
data from the consolidation test suggested that the pumping of groundwater from
aquifer III might be less contribution to the land subsidence with respect to
other aquifers in the future.