Room-and-pillar method is used for mining in most gypsum mines,and a top gypsum layer with a certain thickness in stope is reserved to keep the roof stabilization of stope.

• 大多数石膏矿山采用房柱法开采,通过在采场中保留一定厚度的石膏层来维护顶板的稳定性,护顶层是影响采空区稳定性的重要因素之一。