坚硬顶板控制的数值模拟  

NUMERICAL SIMULATION OF HARD ROOF CONTROL

作　　者：魏锦平[1] 靳钟铭[1] 杨彦风 史红宇 冯文斌 郑有山 

机构地区：[1]太原理工大学采矿工艺研究所,太原030024 [2]大同矿务局,大同037000 [3]西山矿务局,太原030024

出　　处：《岩石力学与工程学报》2002年第A02期2488-2491,共4页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金(59734090);山西省自然科学基金(20021059);太原理工大学自选课题(101832)资助项目

摘　　要：通过对岩层移动的现场观测,建立了综放采场坚硬顶板控制的悬梁模型及其数值模型,运用有限元法分析了坚硬顶板不同来压步距对硬顶煤的压裂效应,并确定了合理的支架阻力,从而对坚硬顶板进行有效的控制,达到消除坚硬顶板对采场的冲击隐患、保证采场矿压对坚硬顶煤的有效压裂及提高顶煤回收率之目的。It is important to reduce the span of the hard roof to avoid its impact load on supports of coal mine. However, in longwall top-coal caving face, the periodical weight of roof is a main factor that crushes the top-coal, which is beneficial to the top-coal recovery. How to use the roof pressure safely is of crucial importance in longwall top-coal caving in China. Based on field monitoring, theoretical analysis of strata movement, the numerical model of hard roof's stepped cantilever structure is built, and the parameters of the model are also determined. The elasto-plastic finite element method is used to analyze the effect of hard coal cracking under the abutment pressure of hard roof, and the cracking coefficient of rock mass is defined according to the stress state of the element and therefore the top-coal cracking is described distinctly under the condition of different roof span and mining technology parameters. So the rational pretreatment span of hard roof is determined, and the rational working resistance of support is selected also. As a result, the hard roof is effectively controlled not only to protect the working face but also to promote the caving of hard top coal to increase the recovery rate of thick seam mined by longwall mining with top-coal caving. An engineering practice of hard roof control based on the above- mentioned conclusion is presented.

关 键 词：数值分析 有限元法 现场观测 岩层移动 坚硬顶板 放顶煤开采 

分 类 号：TD327[矿业工程—矿井建设] O242[理学—计算数学]