【作者】 张建星；

【导师】 柴敬；

【作者基本信息】 西安科技大学 ， 采矿工程， 2009， 硕士

【摘要】 宁东是我国建设的13个亿吨煤炭基地之一,目前宁东煤炭主产区主要集中在灵武矿区2#煤层,2#煤层浅部普遍存在火烧区,火烧区内含有大量积水,严重影响着矿井的安全生产。研究火烧区及其下方开采岩层移动规律,对指导现场生产和建设本质安全型矿井具有一定的现实意义。本文针对神华宁夏煤业集团枣泉煤矿12104和12206工作面工程地质条件及其工作面上方T-2火烧区,综合运用现场调研、理论分析、相似材料模拟实验与数值模拟实验等方法,对火烧区及其下方工作面的开采引起上覆岩层移动、变形、破坏及地表下沉进行研究。研究表明,12104工作面开采完毕后不会受到T-2火烧区影响,但裂隙带发展至地表。12206工作面开采过程中上覆岩层裂隙与12104采空区导通,基岩与表土层间出现裂隙,开采完毕后裂隙与T-2火烧区导通,并发展至地表。T-2火烧区对12206工作面的开采存在着安全隐患,在掘进和回采期间需要采取措施探放水。12104、12206工作面开采完毕后地表下沉成盆地状,并随着采高的增大波及范围扩大,基岩运移下部区域的上覆岩层运移速度慢,上部区域的上覆岩层的运移速度快。根据研究成果,结合现场实际,设计出了工作面掘进过程中探放水方案。更多还原

【Abstract】 Ningdong is one of the 13 coal bases of 100 Mt in china. The main production areas of Ningdong coal base are mainly in the No.2 coal seam of Ningwu coal field. The shallow area of No.2 coal seam has burning area, and the burning area contains plenty hydrops, which affects the safety production of the coal mine significantly. It is very important for the field production and the construction of intrinsically safe type mine to study the burning area and the rock strata movement under the burning area.In this thesis, based on the engineering geological conditions of the 12104 and 12206 mining face of Zaoquan Coal Mine of Shenghua Ningxia Coal Group, and the T-2 burning area above the mining face, the burning area and the overburden movement, deformation and subsidence induced by mining of the mining face under the burning area are studied with field investigation, similar material simulation experiment,theoretical analysis and numerical simulation.The study shows that, the mining of 12104 mining face will not be influenced by T-2 burning area, but the crack zone will develop to the surface. In the mining process of 12206 mining face, the cracks in the overburden will guide circuit with 12104 goaf area. The cracks will also appear between the bedrock and top soil layer, and they will guide circuit with T-2 burning area, and then develop to the surface. The T-2 burning area has potential safety trouble for the mining of the 12206 mining face, and it is essential to survey water during drilling and mining. After the mining of the 12104 and 12206 mining face, the subsidence of the surface look like a basin, and the influencing area will extend as the increasing of the mining height. The overburden movement of the lower area of bed rock is slow, and the overburden movement of the upper area of bed rock is quickly. According to the study results and field practice, the survey water method during drilling and mining is designed.更多还原