昌恒煤矿F1断层带力学测试与煤柱合理留设数值分析

发布时间：2018-06-19 23:28

本文选题：断层防水煤柱 + 力学测试　；参考：《安徽建筑大学》2017年硕士论文

【摘要】：断层防水煤柱的合理留设关系到矿井安全生产与煤炭资源的采出率,若留设的断层防水煤柱既能保证矿井的安全生产又能最大限度的开采煤炭资源,正是秉承了“以人为本、科技兴矿,安全高效和减少资源损失、走可持续发展”社会宗旨和理念。至今留设断层防水煤柱的方法也是层不穷出,但因断层的赋存条件千差万别,所以针对不同的工程背景要根据其具体的赋存条件选用多种方法进行研究。论文以昌恒煤矿的9102工作面外侧F1断层为研究对象,首先,为明确F1断层带的力学及水理性质,在9102工作面风巷靠近断层处施工顶1、顶2、底1、底2四个钻孔并取岩样,对岩样做岩石力学与水理性质测试,水理性质测试包括含水率、吸水率、渗透性、膨胀性与耐崩解性,结果表明:F1断层的岩样构成复杂,是断层角砾岩、断层泥、糜棱状岩石的混杂堆积,并具有“松、散、软、弱”的特点;平均含水率2.53%;平均渗透系数为0.35cm/s,属于“强透水性”类型岩土;平均膨胀率为0.656%;软岩中多半样品十分破碎,遇水即崩解,而且速度较快;大部分岩石稳定性不好,浸水泥化程度较高,属于不稳定、极不稳定岩石。其次,采用FLAC~(3D)软件模拟的方法模拟研究不同工作面推进距离时采空区围岩与断层的采动应力变化、位移变化及塑性区的变化,结果表明:采空区围岩与断层的采动压力、位移量、塑性区范围均随采空区范围的增大而增大,另工作面中部剖切面上的采动矿压、位移量、塑性区范围均比工作面端部的值要大,即留设断层防水煤柱时应根据工作面中部剖切面上的破坏范围留设。采动工作面推进140m时,工作面底板破坏深度为19m,断层带内出现小区域的塑性破坏区,底板的塑性破坏区没有波及至断层带,断层上下盘的界面位移差为0.005dm,断层没有发生活化,预留设45m的断层防水煤柱。再次,采用煤柱弹塑性分区法计算留设的断层防水煤柱的宽度,煤柱弹塑性分区法运用弹塑性极限平衡理论、材料力学理论及断层两盘的岩性分别计算煤柱极限平衡区、弹性区与断层影响带的宽度,计算得煤柱极限平衡区宽度为14.27m,弹性区宽度为28.23m,断层影响带宽度为6.88m,三者之和为49.38m。为保证工作面的安全开采,F1断层防水煤柱的合理宽度取50m。
[Abstract]:The reasonable setting of fault waterproof coal pillar is related to mine safety production and mining rate of coal resources. If the fault waterproof coal pillar can not only guarantee the safety of mine production but also maximize the exploitation of coal resources, it is precisely the "people-oriented" policy. Science and technology, safe and efficient, reduce the loss of resources, sustainable development "social purpose and concept." Up to now, the method of keeping fault waterproof coal pillar is not out of bed, but because the occurrence condition of fault is very different, it is necessary to select many methods according to its specific occurrence condition to study different engineering background. This paper takes the F1 fault outside the 9102 face of Changheng Coal Mine as the research object. Firstly, in order to clarify the mechanical and hydrological properties of F1 fault zone, four boreholes are constructed near the fault in the wind roadway of 9102 working face, namely, the top 1, the top 2, the bottom 1 and the bottom 2, and the rock samples are taken. The rock samples are tested for rock mechanics and hydrological properties, which include water content, water absorption, permeability, expansibility and collapse resistance. The results show that the rock samples of the W F 1 fault are complicated, they are fault breccia, fault gouge. The mixed accumulation of mylonitic rocks with the characteristics of "loose, soft and weak"; the average moisture content is 2.53; the average permeability coefficient is 0.35 cm / s, which belongs to the "strong permeability" type of rock and soil; the average expansion rate is 0.656; and most of the samples in the soft rock are very broken, Most rocks are unstable and unstable because of their poor stability and high degree of cement leaching. Secondly, the dynamic stress, displacement and plastic zone of surrounding rock and fault in goaf are simulated by using the software FLACY 3D. The results show that the mining pressure of wall rock and fault in goaf is analyzed. The range of displacement and plastic zone increases with the increase of goaf, and the range of mining pressure, displacement and plastic zone in the middle of the face is larger than that at the end of the face. The fault waterproof coal pillar should be set according to the damage range of the middle face. When the mining face is advancing 140 m, the floor failure depth of the working face is 19 m, the plastic failure zone of small area appears in the fault zone, the plastic failure area of the bottom plate does not spread to the fault zone, the displacement difference between the upper and lower face of the fault is 0.005 dm, and the fault is not activated. A 45 m fault waterproof coal pillar is reserved. Thirdly, the width of the remaining fault waterproof coal pillar is calculated by the elastoplastic partition method of coal pillar, and the limit equilibrium zone of coal pillar is calculated by the elastoplastic limit equilibrium theory, the theory of material mechanics and the lithology of the two plates of the fault. The width of elastic zone and fault-affected zone is calculated, the width of limit equilibrium zone of coal pillar is 14.27 m, the width of elastic zone is 28.23 m, the width of influence zone of fault is 6.88 m, the sum of the three is 49.38 m. In order to ensure the safe mining of working face, the reasonable width of F1 fault waterproof pillar is 50 m.
【学位授予单位】：安徽建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD745;TD822.3

【参考文献】