上行开采覆岩运移规律与回采巷道位置优化研究
发布时间：2018-12-23 20:27
【摘要】：本文以朱集东煤矿11-2煤层首采面开采后覆岩运移规律和13-1煤层首采面回采巷道的布置为研究对象,将岩层的下沉简化为四周简支的薄板挠曲问题对其进行数学描述,采用预测地表沉陷的概率积分法研究了煤层开采后覆岩内部位移场,运用相似模拟实验研究了11-2煤层顶板岩层的活动规律及其对13-1煤层的扰动,基于FLAC3D数值实验提出不稳定性指数概念,以此对上部回采巷道位置进行优化。取得研究成果如下:(1)将岩层的下沉简化为四周简支的薄板挠曲问题,对岩层的移动进行数学描述,给出单一缓斜岩层的移动的基本公式及边界条件,采用分析地表移动基本规律的概率积分法分析了覆岩内部位移场。(2)采用相似模拟实验研究了上行开采顶板活动规律及对上覆煤层的扰动。认为随11-2煤层首采面的推进,直接顶初次来压后基本顶发生周期性的破断,来压步距为20~30m。13-1煤层位于11-2煤层回采后的弯曲下沉带内,煤层整体下沉,煤层水平位移的最大值分别为-130.5mm和99.8mm、最大下沉量为1.55m、最大膨胀和压缩变形量为15.79mm和19.07mm,表明13-1煤层整体性遭到一定的破坏,变形量不大,仍能保持连续性,能够满足上行开采的条件。(3)采用FLAC3D数值计算分析了层间距和水平错距对上行开采上覆煤层巷道稳定性的影响。依据数值计算结果提出不稳定性指数的概念及计算公式,分析不同区域巷道不稳定指数云图对上覆煤层回采巷道的位置进行优化,确定朱集东煤矿上覆13-1煤层首采面回采巷道的合理位置为相对于下伏11-2煤层首采面回采巷道内错15~20m。(4)朱集东煤矿13-1煤层首采面1111(3)轨道顺槽相对于11-2煤层首采面1111(1)回采巷道内错15m掘进,巷道处于卸压区内应力环境较好且煤层结构能够保持完整性,根据数值计算结果给出掘进期间锚网支护方案,掘进后累计28天内两帮累计变形量为40mm。顶底板累计移近量为114mm。设计支护方案及参数能控制巷道围岩掘进期间的大变形,巷道整体控制效果较好。
[Abstract]:In this paper, the overburden migration law of 11-2 coal seam in Zhujidong Coal Mine and the layout of mining roadway of 13-1 coal seam's first mining face are taken as the research object, and the subsidence of rock layer is reduced to the thin plate deflection problem with simple support around it. The internal displacement field of overburden rock after coal seam mining is studied by using probabilistic integration method to predict surface subsidence. The movement law of roof strata and disturbance to 13-1 coal seam in seam 11-2 are studied by similar simulation experiment. Based on the FLAC3D numerical experiment, the concept of instability index is proposed to optimize the position of the upper mining roadway. The research results are as follows: (1) the subsidence of rock layer is simplified as a thin plate flexural problem with simply supported around it, the movement of rock layer is described mathematically, and the basic formula and boundary conditions of the movement of single inclined rock layer are given. The internal displacement field of overburden is analyzed by probability integration method, which is used to analyze the basic law of surface movement. (2) the law of roof movement and the disturbance to overlying coal seam are studied by similar simulation experiment. It is considered that with the advance of the first mining face of 11-2 coal seam, the basic roof breaking occurs periodically after the direct roof first pressing, and the pressure step distance is that the 20~30m.13-1 coal seam is located in the bending subsidence zone of 11-2 seam after mining, and the whole seam is sinking. The maximum horizontal displacement of coal seam is-130.5mm and 99.8 mm, the maximum subsidence is 1.55 m, the maximum expansion and compression deformation is 15.79mm and 19.07 mm, which indicates that 13-1 coal seam has been destroyed to some extent, and the deformation is not large. It can maintain continuity and satisfy the condition of uplink mining. (3) the influence of layer spacing and horizontal offset on the stability of overlying coal roadway in uplink mining is analyzed by FLAC3D numerical calculation. According to the results of numerical calculation, the concept and formula of instability index are put forward, and the instability index cloud map of different regions is analyzed to optimize the position of mining roadway in overlying coal seam. It is determined that the reasonable position of the first mining roadway of the top 13-1 coal seam in Zhujidong Coal Mine is 151520m. (4) 1111 (3) track of the first mining face of 13-1 coal seam in Zhujidong Coal Mine. Relative to the first mining face of 11-2 coal seam, the 1111 (1) stoping roadway is excavated by 15m displacement. The stress environment of roadway in pressure relief area is better and the coal seam structure can keep integrality. According to the results of numerical calculation, the bolting and mesh supporting scheme during the excavation period is given. The accumulative deformation of the two sides within 28 days after excavation is 40 mm. The cumulative movement of the top and bottom plate is 114 mm. The design of supporting scheme and parameters can control the large deformation of roadway surrounding rock during excavation, and the overall control effect of roadway is better.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353
本文编号：2390218
[Abstract]:In this paper, the overburden migration law of 11-2 coal seam in Zhujidong Coal Mine and the layout of mining roadway of 13-1 coal seam's first mining face are taken as the research object, and the subsidence of rock layer is reduced to the thin plate deflection problem with simple support around it. The internal displacement field of overburden rock after coal seam mining is studied by using probabilistic integration method to predict surface subsidence. The movement law of roof strata and disturbance to 13-1 coal seam in seam 11-2 are studied by similar simulation experiment. Based on the FLAC3D numerical experiment, the concept of instability index is proposed to optimize the position of the upper mining roadway. The research results are as follows: (1) the subsidence of rock layer is simplified as a thin plate flexural problem with simply supported around it, the movement of rock layer is described mathematically, and the basic formula and boundary conditions of the movement of single inclined rock layer are given. The internal displacement field of overburden is analyzed by probability integration method, which is used to analyze the basic law of surface movement. (2) the law of roof movement and the disturbance to overlying coal seam are studied by similar simulation experiment. It is considered that with the advance of the first mining face of 11-2 coal seam, the basic roof breaking occurs periodically after the direct roof first pressing, and the pressure step distance is that the 20~30m.13-1 coal seam is located in the bending subsidence zone of 11-2 seam after mining, and the whole seam is sinking. The maximum horizontal displacement of coal seam is-130.5mm and 99.8 mm, the maximum subsidence is 1.55 m, the maximum expansion and compression deformation is 15.79mm and 19.07 mm, which indicates that 13-1 coal seam has been destroyed to some extent, and the deformation is not large. It can maintain continuity and satisfy the condition of uplink mining. (3) the influence of layer spacing and horizontal offset on the stability of overlying coal roadway in uplink mining is analyzed by FLAC3D numerical calculation. According to the results of numerical calculation, the concept and formula of instability index are put forward, and the instability index cloud map of different regions is analyzed to optimize the position of mining roadway in overlying coal seam. It is determined that the reasonable position of the first mining roadway of the top 13-1 coal seam in Zhujidong Coal Mine is 151520m. (4) 1111 (3) track of the first mining face of 13-1 coal seam in Zhujidong Coal Mine. Relative to the first mining face of 11-2 coal seam, the 1111 (1) stoping roadway is excavated by 15m displacement. The stress environment of roadway in pressure relief area is better and the coal seam structure can keep integrality. According to the results of numerical calculation, the bolting and mesh supporting scheme during the excavation period is given. The accumulative deformation of the two sides within 28 days after excavation is 40 mm. The cumulative movement of the top and bottom plate is 114 mm. The design of supporting scheme and parameters can control the large deformation of roadway surrounding rock during excavation, and the overall control effect of roadway is better.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353
【参考文献】
相关期刊论文 前4条
1 石必明,俞启香;远距离保护层开采煤岩移动变形特性的试验研究[J];煤炭科学技术;2005年02期
2 蒋金泉,孙春江,尹增德,张殿振;深井高应力难采煤层上行卸压开采的研究与实践[J];煤炭学报;2004年01期
3 钱鸣高,许家林;覆岩采动裂隙分布的“O”形圈特征研究[J];煤炭学报;1998年05期
4 冯国瑞;闫旭;王鲜霞;康立勋;翟英达;;上行开采层间岩层控制的关键位置判定[J];岩石力学与工程学报;2009年S2期
相关博士学位论文 前1条
1 冯国瑞;残采区上行开采基础理论及应用研究[D];太原理工大学;2009年
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