煤矿采空区塌陷影响范围研究
发布时间：2018-08-09 19:47
【摘要】：改革开放以来直到21世纪初,因过于重视经济效益而忽视对环境产生的恶劣影响的事件并不少见。湖南某煤矿自建矿以来,一直采用陷落法管理顶板,由于矿产被开采后留下的采空区不作处理,从而引发了采空区上覆区域产生地表塌陷、道路及房屋开裂,池塘干涸,水井干枯等后果,影响当地居民的正常生活。本文基于此工程实例,运用解析法、概率积分法和有限元数值分析方法对煤矿采空区地表塌陷的影响范围进行研究。论文主要内容如下:(1)通过前期对研究区的现场调研工作,得到矿山的基本情况:采用斜井开拓,走向壁式采矿,全部陷落法管理顶板,水文地质条件属简单类型,其表层土体工程地质性能差,其他岩体属于中硬~坚硬岩体。矿山共分 20m、 55 m、 90 m、 150 m、 200m、 250m、 300m七个水平;统计了采空区情况,空区分布位置在 150 m~ 300 m水平,空区的总面积为:181892.43平方米,总体积是685760.28立方米;总结了此矿山开采沉陷危害主要是上覆地表建筑物受损、道路受损和局部地表塌陷3种类型,并据此绘制了采空区平面投影的分布图和基于实测的采空区地表塌陷范围图。(2)根据移动盆地特性,本文选择矿山移动角确定移动盆地的危险移动边界,共计25个边界点,采用走向移动角δ=70°,下山移动角β=δ 0.6α,上山移动角γ=70°,表层土移动角φ=45°代入到公式中,最后得到25个点的地面塌陷影响半径在111.80~379.57米之间,将25个点连线成一个闭合圈,即是解析法圈定的采空区塌陷影响范围。(3)依据2006年的塌陷影响范围结果反演概率积分法所需参数,得到4、6、7煤层tgβ分别是1.58,1.76和1.67,选取23个边界点代入,得到地面塌陷影响半径在169.30~253.95米之间,将23个点连线成一个闭合即可圈定地表塌陷影响的范围。(4)运用有限元分析软件,建立1400m×1300m×500m三维实体模型,选取摩尔库伦准则,分 150~ 200m、 150~ 250m和 150~ 300m三个水平进行开采模拟,在 150~ 300m水平得到地表塌陷区的影响范围。(5)综合三种方法,最终选择数值模拟法的结果为本文采空区地表塌陷的影响范围。
[Abstract]:Since the reform and opening up to the beginning of the 21st century, it is not uncommon to neglect the adverse effects on the environment due to too much attention to economic benefits. Since a coal mine was built in Hunan province, the roof has been managed by subsidence method. Because the goaf left after the mining has not been treated, the overlying area of the goaf has caused the surface collapse, the roads and houses cracking, and the pond dried up. Water wells dry up and other consequences, affecting the normal life of local residents. Based on this engineering example, the influence range of surface subsidence in goaf of coal mine is studied by analytic method, probability integration method and finite element numerical analysis method. The main contents of this paper are as follows: (1) through the field investigation of the research area in the early stage, the basic situation of the mine is obtained: the inclined well development, the wall mining, the roof management by all the subsidence methods, and the simple hydrogeological conditions. The surface soil is of poor engineering geological performance and other rock masses belong to medium hard-hard rock mass. The mine is divided into seven levels: 20 m, 55 m, 90 m, 150 m, 200 m, 250 m, and 300 m. The distribution of the goaf is in the level of 150m ~ 300m, the total area of the empty area is 685760.28 cubic meters, the total area of the empty area is 1: 181892.43 square meters, the total volume of the empty area is 685760.28 cubic meters. This paper summarizes three types of mining subsidence damage in this mine, such as damage of overlying surface buildings, road damage and local surface subsidence. Based on this, the distribution map of the plane projection of the goaf and the area map of the surface collapse in the goaf are drawn. (2) according to the characteristics of the moving basin, this paper selects the moving angle of the mine to determine the dangerous moving boundary of the moving basin, with a total of 25 boundary points. The angle of strike movement is 70 掳, the angle of downhill movement is 尾 = 未 0. 6 伪, the angle of moving up mountain is 70 掳, and the angle of surface soil movement is 45 掳. Finally, the influence radius of ground collapse of 25 points is found to be between 111.800 and 379.57 meters, and the 25 points are connected into a closed circle. (3) according to the parameters of inversion probability integration method of the result of collapse influence range in 2006, we get that the tg 尾 of 4jiao 6jiao 7 coal seam is 1.58% 1.76 and 1.67 respectively, and select 23 boundary points to substitute. The influence radius of ground subsidence is between 169.30 and 253.95 meters, and 23 points are connected into a closed line to delineate the range of surface subsidence. (4) by using finite element analysis software, a three-dimensional solid model of 1400m 脳 1300m 脳 500m is established, and the Moore Coulomb criterion is selected. The mining simulation is carried out at three levels of 150 ~ 200m, 150m ~ 250m and 150m ~ 300m respectively, and the influence range of subsidence area is obtained at the level of 150m ~ 300m. (5) by synthesizing three methods, the result of numerical simulation method is chosen to be the influence range of surface subsidence in goaf in this paper.
【学位授予单位】：南华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD327
本文编号：2175127
[Abstract]:Since the reform and opening up to the beginning of the 21st century, it is not uncommon to neglect the adverse effects on the environment due to too much attention to economic benefits. Since a coal mine was built in Hunan province, the roof has been managed by subsidence method. Because the goaf left after the mining has not been treated, the overlying area of the goaf has caused the surface collapse, the roads and houses cracking, and the pond dried up. Water wells dry up and other consequences, affecting the normal life of local residents. Based on this engineering example, the influence range of surface subsidence in goaf of coal mine is studied by analytic method, probability integration method and finite element numerical analysis method. The main contents of this paper are as follows: (1) through the field investigation of the research area in the early stage, the basic situation of the mine is obtained: the inclined well development, the wall mining, the roof management by all the subsidence methods, and the simple hydrogeological conditions. The surface soil is of poor engineering geological performance and other rock masses belong to medium hard-hard rock mass. The mine is divided into seven levels: 20 m, 55 m, 90 m, 150 m, 200 m, 250 m, and 300 m. The distribution of the goaf is in the level of 150m ~ 300m, the total area of the empty area is 685760.28 cubic meters, the total area of the empty area is 1: 181892.43 square meters, the total volume of the empty area is 685760.28 cubic meters. This paper summarizes three types of mining subsidence damage in this mine, such as damage of overlying surface buildings, road damage and local surface subsidence. Based on this, the distribution map of the plane projection of the goaf and the area map of the surface collapse in the goaf are drawn. (2) according to the characteristics of the moving basin, this paper selects the moving angle of the mine to determine the dangerous moving boundary of the moving basin, with a total of 25 boundary points. The angle of strike movement is 70 掳, the angle of downhill movement is 尾 = 未 0. 6 伪, the angle of moving up mountain is 70 掳, and the angle of surface soil movement is 45 掳. Finally, the influence radius of ground collapse of 25 points is found to be between 111.800 and 379.57 meters, and the 25 points are connected into a closed circle. (3) according to the parameters of inversion probability integration method of the result of collapse influence range in 2006, we get that the tg 尾 of 4jiao 6jiao 7 coal seam is 1.58% 1.76 and 1.67 respectively, and select 23 boundary points to substitute. The influence radius of ground subsidence is between 169.30 and 253.95 meters, and 23 points are connected into a closed line to delineate the range of surface subsidence. (4) by using finite element analysis software, a three-dimensional solid model of 1400m 脳 1300m 脳 500m is established, and the Moore Coulomb criterion is selected. The mining simulation is carried out at three levels of 150 ~ 200m, 150m ~ 250m and 150m ~ 300m respectively, and the influence range of subsidence area is obtained at the level of 150m ~ 300m. (5) by synthesizing three methods, the result of numerical simulation method is chosen to be the influence range of surface subsidence in goaf in this paper.
【学位授予单位】：南华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD327
【参考文献】
相关期刊论文 前1条
1 刘红元,唐春安,芮勇勤;多煤层开采时岩层垮落过程的数值模拟[J];岩石力学与工程学报;2001年02期
，本文编号：2175127
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