..., and the results were compared with those in the groundwater before test. The mineral morphologies of fracture surfaces before and after test were also examined through SEM scanning. Test results show that there are no obvious variations of SiO 2 and Al 3+ in the outlet solution during the process of seepage...

... the fracture surface. Its trajectory was "S" type. When mountainous coal seam mined, overlying strata would produce lateral displacement with direction to the free surface. 1 Introduction In western China there were abundant coal resources, and a large proportion of them were buried shallow...