护顶层对石膏矿采空区稳定性影响研究

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。在石膏矿采场护顶层破坏模式分析的基础上,以湖南常德某矿山的实测数据为例,采用理论计算方法,分析了护顶矿层稳定性的影响因素,根据该石膏矿开采结构参数,提出了合理的护顶层厚度,为石膏矿山采场护顶层厚度的设计提供了理论依据。

Influence of Top-safeguarding Layer on Stability of Mined-out Area in Gypsum Mines

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.The top-safeguarding layer is one of important factors to influence roof stability of mined-out area.Based on analysis of failure patterns of top-safeguarding layer of stope in gypsum mines and the data results from the on-site survey in some gypsum mine in Changde,Hunan Province,the factors influencing the stability of top-safeguarding layer was analyzed by theoretical calculation,a reasonable thickness of top-safeguarding layer was presented out according to the mining structure parameters for the gypsum mine.It provides the theoretical basis for the thickness design of top-safeguarding layer of stope in gypsum mines.