蒋家河煤矿回采巷道底板破坏机理与支护研究

发布时间：2018-03-10 07:46

  本文选题：底板破坏机理　切入点：运输顺槽　出处：《西安科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：矩形巷道底板破坏机理与支护研究是煤矿建设和生产中的重要课题之一。本文以蒋家河煤矿ZF204运输顺槽为工程背景,采用现场实测、物理模拟、数值模拟与理论分析等方法,研究巷道底板破坏机理和支护方案确定。(1)通过物理相似模拟,可以得出ZF204运输顺槽破坏,主要巷帮下沉开始的,帮脚破坏,底板受巷帮压力隆起。巷帮破坏引起围岩极限平衡拱增大,巷帮与顶板原支护效果降低,帮部发生片帮,下帮破坏比较严重,出现煤体破碎,下帮锚杆支护失效,顶板发生离层破坏,顶板下沉,出现网兜现象。(2)建立巷道底板破坏力学模型,计算出不考虑底板自重和考虑底板自重情况下巷道两帮底板极限承载力,绘制极限承载力与巷道底板内聚力和内摩擦角的变化曲线。内摩擦角一定时,巷道两帮底板极限承载力与内聚力成一次线性关系,内摩擦角越大,对应巷道极限承载力与内聚力所成斜率越大;内聚力一定时,内摩擦角越小,极限承载力越小,极限承载力随着内摩擦角的减小,刚开始降低的比较快,之后缓慢降低,趋于稳定。(3)通过巷道底板破坏范围进行分析,得出φ值一定时,底板岩体帮脚破坏深度hbd和底板最大破坏深度hd max与煤帮破坏深度L成线性增长关系。若L1max+l2maxW0,W0为巷道开挖宽度,巷道底板成“W”破坏;若llmax+l2max≥W0,巷道底板成拱形破坏,巷道底板破坏对两帮和顶板稳定性具有显著影响,采用“极限平衡圈”理论计算出底板破坏引起顶板破坏最大值。(4)巷道极限平衡圈支护条件下,运输顺槽底板极限承载力为23.42MPa,底板最大破坏深度为3.57m,两帮脚底板破坏深度为1.67m,底板破坏引起巷帮破坏深度为1.52m,顶板自然平衡拱高为3.24m,极限平衡拱高为5.45m,选用锚网索+底锚方案。
[Abstract]:The research on the failure mechanism and support of rectangular roadway floor is one of the important topics in coal mine construction and production. This paper takes Jiangjiahe coal mine ZF204 transportation channel as the engineering background, adopts the methods of field measurement, physical simulation, numerical simulation and theoretical analysis, etc. By studying the failure mechanism of roadway floor and determination of supporting scheme. 1) through the physical similarity simulation, it can be concluded that the ZF204 transport failure along the channel, the main roadway side sinking begins, the help foot damage, The floor is uplifted by the pressure of the roadway side. The failure of the roadway side causes the increase of the ultimate equilibrium arch of the surrounding rock, the effect of the original support of the roadway and the roof is reduced, the slab of the side is damaged seriously, the coal body is broken, and the bolting support of the bottom side is invalid. The failure of the roof, the subsidence of the roof, the phenomenon of netting and the appearance of the phenomenon of net pocket.) the failure model of the roadway floor is established, and the ultimate bearing capacity of the two sides of the roadway is calculated when the weight of the floor is not considered and the weight of the floor is taken into account. When the angle of internal friction is fixed, the relationship between ultimate bearing capacity and cohesion of roadway floor is linear, and the angle of internal friction is larger. The slope corresponding to the ultimate bearing capacity and cohesion of the roadway is larger; the smaller the angle of internal friction is, the smaller the ultimate bearing capacity is when the cohesion force is fixed, the lower the ultimate bearing capacity is with the decrease of the angle of internal friction, the lower the ultimate bearing capacity is at first, and then the slowly decreasing. Through the analysis of the failure range of roadway floor, it is concluded that the depth of floor rock floor failure hbd and the maximum damage depth HD max of floor rock mass are linearly increased with the depth of coal side damage L when 蠁 is fixed. If L 1max L 2maxW 0 W 0 is the width of roadway excavation, the relation between the depth of floor rock mass failure and the depth of coal side damage L is linear. If llmax _ (l2max) 鈮，

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