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S钾矿地表出现了好几处由现有下沉模型所不能解释的下沉剖面。采动下沉受坚硬岩石的桥拱作用影响。对这个理论作一些修正就能解释所观测到的受桥拱作用的下沉剖面。此外,还有一处特别的较浅的二次下沉盆地,它从初次下沉盆地起向外延伸2～3km远。本文采用因陷落带邻区孔隙水压下降而产生弹性压缩的机理,来解释二次下沉现象,该孔隙水压理论对s钾矿的安全开采起到了指导作用。
There are several subsidence profiles that can not be explained by the existing subsidence models at the surface of the Potash deposit. Mining sinking hard rock bridge arch effect. Some correction to this theory can explain the observed subsidence profile due to the effect of the bridge arch. In addition, there is a special shallow secondary subsidence basin that extends 2-3 km away from the initial subsidence basin. In this paper, the phenomenon of secondary sinking is explained by the mechanism of elastic compression caused by the drop of pore water pressure in the adjacent zone of the subsidence zone. The pore water pressure theory plays a guiding role in the safe mining of the sylvite.