本文以马兰矿综采工作面上覆岩层为研究背景,在拱—梁运动结构为理论基础,详细分析了"煤—煤"顶板结构、"岩—矸"顶板结构和岩梁顶板结构下上覆岩层的运动规律,结合马兰矿实际矿井条件,借助F L A C 3 D数值模拟软件...本文以马兰矿综采工作面上覆岩层为研究背景,在拱—梁运动结构为理论基础,详细分析了"煤—煤"顶板结构、"岩—矸"顶板结构和岩梁顶板结构下上覆岩层的运动规律,结合马兰矿实际矿井条件,借助F L A C 3 D数值模拟软件,模拟了不同支护强度下顶板垂直应力分布状况,得到支护强度越大,顶板垂直位移越小的结论,综合考虑支护效果与经济合理性后,得到支护强度为0.7MPa时,顶板变形得到很好的控制,保证生产安全进行的同时,液压支架投入成本合理,控制了顶板的垂直位移变形且保证必要的工作空间,经济合理。展开更多
An underground coal mine located in New South Wales has a target coal seam located 160-180 m deep directly below a 16-20 m thick conglomerate unit that has been associated with significant periodic weighting events on...An underground coal mine located in New South Wales has a target coal seam located 160-180 m deep directly below a 16-20 m thick conglomerate unit that has been associated with significant periodic weighting events on the Iongwall face. As part of the investigations to better understand the causes of periodic weighting at the mine. inclinometers capable of measuring horizontal shear movements through the full section of the overburden strata were installed ahead of mining at two locations approximately 1 km apart above the centre of two iongwall panels. These inclinometers were monitored as the longwall approached each site. This paper presents the details of the installation, the results of the inclinometer monitoring at both sites, and the insights that these measurements provide for overburden behaviour about longwall panels. Horizontal shear movements were observed to develop on shear horizons that correlate closely across the two sites suggesting a mechanism that is consistent across a large area of the mine. Shear movements were observed to develop on a single horizon near the top of the conglomerate strata that was mobilised almost immediately after initial formation of the longwall goal at a distance of 425 m ahead of the longwall face.展开更多
文摘本文以马兰矿综采工作面上覆岩层为研究背景,在拱—梁运动结构为理论基础,详细分析了"煤—煤"顶板结构、"岩—矸"顶板结构和岩梁顶板结构下上覆岩层的运动规律,结合马兰矿实际矿井条件,借助F L A C 3 D数值模拟软件,模拟了不同支护强度下顶板垂直应力分布状况,得到支护强度越大,顶板垂直位移越小的结论,综合考虑支护效果与经济合理性后,得到支护强度为0.7MPa时,顶板变形得到很好的控制,保证生产安全进行的同时,液压支架投入成本合理,控制了顶板的垂直位移变形且保证必要的工作空间,经济合理。
文摘An underground coal mine located in New South Wales has a target coal seam located 160-180 m deep directly below a 16-20 m thick conglomerate unit that has been associated with significant periodic weighting events on the Iongwall face. As part of the investigations to better understand the causes of periodic weighting at the mine. inclinometers capable of measuring horizontal shear movements through the full section of the overburden strata were installed ahead of mining at two locations approximately 1 km apart above the centre of two iongwall panels. These inclinometers were monitored as the longwall approached each site. This paper presents the details of the installation, the results of the inclinometer monitoring at both sites, and the insights that these measurements provide for overburden behaviour about longwall panels. Horizontal shear movements were observed to develop on shear horizons that correlate closely across the two sites suggesting a mechanism that is consistent across a large area of the mine. Shear movements were observed to develop on a single horizon near the top of the conglomerate strata that was mobilised almost immediately after initial formation of the longwall goal at a distance of 425 m ahead of the longwall face.
