急倾斜特厚煤层基本顶破断规律研究

发布时间：2018-06-15 06:38

本文选题：水平分段综放开采 + 简支梁　；参考：《煤炭科学技术》2017年09期

【摘要】：为研究急倾斜特厚煤层综放工作面顶板的破断规律,以乌东煤矿北采区45°倾角煤层为研究对象,根据简支梁理论建立了急倾斜特厚煤层综放开采条件下顶板的受力模型,得到顶板的力矩方程,分析基本顶破断位置,对破断后的基本顶基于悬臂梁理论建立力学模型,得到顶板的拉应力方程,分析不同回采环境下基本顶破断长度,同时采用3DEC软件对不同回采环境下顶板破断长度进行数值计算。结果表明:急倾斜特厚煤层综放开采在充分采动条件下顶板中部最先破断;随着基本顶厚度的增加,基本顶的破断长度呈线性减小;随着回采段高的增加,基本顶的破断比呈抛物线增加。现场采用钻孔窥视,获得基本顶的破坏情况,监测结果和理论分析基本一致,为后续的顶板"注水-爆破"耦合钻孔位置提供科学依据,对于煤矿的顶板灾害防治有重要意义。
[Abstract]:In order to study the breaking rule of roof in fully-mechanized caving face of steep and extra thick coal seam, taking the 45 掳inclined coal seam in north mining area of Wudong Coal Mine as the research object, the force model of roof under the condition of fully mechanized caving mining in steep and extra thick coal seam is established according to the theory of simply supported beam. The moment equation of the roof is obtained, the position of the basic roof breaking is analyzed, the mechanical model of the basic roof after breaking is established based on the cantilever beam theory, the tensile stress equation of the roof is obtained, and the basic breaking length of the roof under different mining conditions is analyzed. At the same time, using 3DEC software, the roof breaking length under different mining environment is calculated numerically. The results show that in the condition of full mining, the top of the top is broken first, the breaking length of the basic roof decreases linearly with the increase of the thickness of the basic top, and the height of the mining section increases with the height of the mining section. The breaking ratio of the base roof increases with parabola. The monitoring results are consistent with the theoretical analysis, which provides a scientific basis for the subsequent roof "waterflooding and blasting" coupled drilling position, and is of great significance for the prevention and control of roof disaster in coal mines.
【作者单位】：神华新疆能源有限责任公司;西安科技大学能源学院;
【基金】：新疆维吾尔自治区科技计划资助项目(201432102)
【分类号】：TD323

【相似文献】