河兴梁井田烧变岩区煤层顶底板稳定性评价

Stability evaluation of coal seam roof and floor in burnt rock area of Hexingliang mine field

煤层自燃形成烧变岩是一种很普遍的现象,对烧变岩区煤层的研究不仅可以反演煤层演化的地质历史和古气候、古地理环境,而且可为评价煤层顶底板稳定性提供依据。通过对河兴梁井田烧变岩区煤层工程地质特征及结构特性进行研究,将区域地层划分为3大岩类7个岩层组,将岩体划分为散体结构、碎裂结构、层状结构和块状结构四大岩体结构类型。对煤层顶底板结构和力学性质的研究发现,张性裂隙及气孔状构造使煤层具有良好的储水空间,可采煤层顶底板中软弱岩石发育,烧变岩和岩石风化带工程地质条件差,局部地段易发生顶板冒落及底板软化变形等矿山工程地质问题,在后期矿井建设和生产中应加强井巷工程维护和煤层顶板管理,从而有效避免工程事故的发生。

The spontaneous combustion of coal seams to form burnt rocks is a very common phenomenon.The study of coal seams in the burnt rock area can not only invert the geological history of coal seam evolution and paleoclimate and paleogeographic environment,but also provide a basis for evaluating the stability of coal mine roof and floor and mine safety production.Based on the study of the engineering geological characteristics and structural characteristics of the coal seams in the burnt rock area of Hexingliang coal mine,the regional strata are divided into three major rock types and seven rock formations,and the coal mine rock mass is divided into four major rock mass structure types:loose structure,cataclastic structure,layered structure and massive structure.The research on the structure and mechanical properties of the roof and floor of the coal seam shows that the coal seam has a good water storage space due to the tensile fracture and pore structure,the weak rock in the roof and floor of the minable coal seam is developed,and the engineering geological conditions of the burnt rock and oxidation zone are poor.It is recommended to strengthen the engineering maintenance of the shaft and roadway and the management of the coal seam roof in the construction and production of the coal mine in order to effectively prevent engineering accidents.