石门揭煤诱导煤与瓦斯突出的静动应力分析

Analysis on Static and Dynamic Stress in Gas and Coal Outburst During Uncovering Coal Seam by Cross-cut

通过对石门揭煤过程中前方煤体内部静、动应力以及瓦斯膨胀能对煤与瓦斯突出的作用分析,提出高瓦斯煤层受到扰动以前在静应力的作用下聚积有高弹性变形能和瓦斯膨胀能,受到采掘扰动时,很容易在长时集中应力和瞬时突变应力的作用下引起煤与瓦斯突出。并通过UDEC软件模拟石门揭煤过程中煤体内集中应力的变化、塑性区分布、裂隙的发育以及位移变化情况,较好地验证了静、动应力对诱导煤与瓦斯突出的作用。

By analyzing the function of the static and dynamic stress as well as expansion energy of gas in the coal seam ahead of the driving action on gas and coal outburst,a conclusion is put forward： the coal seam collects much elastic deformation energy and gas ex- pansion energy before it is influenced. Once the coal seam with high gas content is influenced by the long-time concentrated and instant- saltation stress when mining,it is easy to induce the gas and coal outburst. The changes of concentrated stress, the distribution of plastic zone,the development of the fractures and movement changes of coal seam were simulated by using the UI）EC software, which demon- strated the fact that the static and dynamic stress induce the gas and coal outburst.