唐山某煤矿采空区地表变形机理及危险性评价研究
发布时间：2019-01-05 20:14
【摘要】：伴随我国城镇化不断推进,土地资源日益紧张,许多基础性建设会在矿区用地上展开,由于采空区的不稳定性,往往给工程建设带来极大安全隐患问题,为了保证矿区上部的建筑安全稳定,防止由采空区的大变形造成地表建筑物损坏,研究煤矿开采后地表变形位移及应力特征对我国矿区土地的有效利用和建设规划具有重要借鉴指导意义。本论文结合唐山城市规划区采空塌陷调查评价专题报告,开展了研究区内采空区地表变形位移研究,本文通过对该区综合勘察资料的分析,确定了研究区内基本工程地质条件,并得出研究区内主要采空区的分布特征、规模及覆岩物理力学特性,随之借助FLAC3D模拟软件模拟了在不同开采条件下采空区的地表变形位移特征;分析不同影响因素对地表变形位移的影响规律,接着运用FLAC3D模拟软件对研究区内典型采空区进行数值模拟研究,分析煤层开采后的地表变形位移和各岩层的应力变化特征,然后基于概率积分地表变形预测方法对采空区地表变形做出预测,并将之前数值模拟结果与概率积分方法计算结果对比分析,确定数学计算的可信性,最后根据划分标准,对该区整体做危险性分区,为以后在该区域开展工程工作提供资料指导。主要取得如下成果:分析研究了采空区上覆岩层和地表的位移变形特征,初步研究分析了采空区三带分布与水平、倾斜煤层地表沉陷盆地特征;通过FLAC3D数值模拟软件,研究了各开采条件下地表变形机理特征,得出影响因子;通过整理研究区综合勘察资料,确定采空区分布特征,借助FLAC3D进行模拟计算,得出各地层竖向、水平位移规律及内部应力分布特征;借助概率积分法,对整体进行计算,得出地表变形位移图,并比对相同区域的数值模拟和概率积分计算的结果,确定数学计算结果的可靠性,并依据划分标准,对整体进行危险性分区,得出分区图。
[Abstract]:With the continuous development of urbanization in China, land resources are increasingly tight, many basic construction will be carried out on the mining land, because of the instability of goaf, it often brings great security problems to engineering construction. In order to ensure the safety and stability of the building in the upper part of the mining area and prevent the damage of the surface buildings caused by the large deformation of the goaf, It is of great significance to study the characteristics of surface deformation, displacement and stress after coal mining for the effective utilization and construction planning of mining area in China. Combined with the special report on the investigation and evaluation of mining collapse in Tangshan urban planning area, this paper has carried out the research on the surface deformation and displacement of goaf in the study area. Through the analysis of the comprehensive survey data in this area, the basic engineering geological conditions in the study area have been determined. The distribution, scale and physical and mechanical characteristics of the main goaf in the study area are obtained, and then the surface deformation and displacement characteristics of the goaf under different mining conditions are simulated by FLAC3D simulation software. This paper analyzes the influence of different influencing factors on the surface deformation displacement, and then uses FLAC3D software to simulate the typical goaf in the study area, and analyzes the surface deformation displacement and the stress variation characteristics of each rock layer after coal seam mining. Then the surface deformation of goaf is predicted based on probabilistic integral method, and the results of numerical simulation and probabilistic integral method are compared and analyzed to determine the credibility of mathematical calculation. Make the dangerous zoning to the whole area, and provide the data guidance for carrying out the engineering work in this area. The main achievements are as follows: the characteristics of displacement and deformation of overlying strata and surface in goaf are analyzed, the distribution and level of three zones in goaf and the characteristics of subsidence basin in inclined coal seam are studied preliminarily. Through FLAC3D numerical simulation software, the characteristics of surface deformation mechanism under various mining conditions are studied, and the influence factors are obtained. Through sorting out the comprehensive survey data of the study area, the distribution characteristics of the goaf are determined, and the vertical and horizontal displacement law and the internal stress distribution characteristics of the various layers are obtained by using the FLAC3D simulation calculation. With the help of probability integral method, the whole deformation displacement map is obtained, and compared with the numerical simulation of the same area and the result of probabilistic integral calculation, the reliability of the mathematical calculation result is determined, and according to the dividing standard, Carry on the dangerous partition to the whole, draw the partition map.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD325.3
本文编号：2402254
[Abstract]:With the continuous development of urbanization in China, land resources are increasingly tight, many basic construction will be carried out on the mining land, because of the instability of goaf, it often brings great security problems to engineering construction. In order to ensure the safety and stability of the building in the upper part of the mining area and prevent the damage of the surface buildings caused by the large deformation of the goaf, It is of great significance to study the characteristics of surface deformation, displacement and stress after coal mining for the effective utilization and construction planning of mining area in China. Combined with the special report on the investigation and evaluation of mining collapse in Tangshan urban planning area, this paper has carried out the research on the surface deformation and displacement of goaf in the study area. Through the analysis of the comprehensive survey data in this area, the basic engineering geological conditions in the study area have been determined. The distribution, scale and physical and mechanical characteristics of the main goaf in the study area are obtained, and then the surface deformation and displacement characteristics of the goaf under different mining conditions are simulated by FLAC3D simulation software. This paper analyzes the influence of different influencing factors on the surface deformation displacement, and then uses FLAC3D software to simulate the typical goaf in the study area, and analyzes the surface deformation displacement and the stress variation characteristics of each rock layer after coal seam mining. Then the surface deformation of goaf is predicted based on probabilistic integral method, and the results of numerical simulation and probabilistic integral method are compared and analyzed to determine the credibility of mathematical calculation. Make the dangerous zoning to the whole area, and provide the data guidance for carrying out the engineering work in this area. The main achievements are as follows: the characteristics of displacement and deformation of overlying strata and surface in goaf are analyzed, the distribution and level of three zones in goaf and the characteristics of subsidence basin in inclined coal seam are studied preliminarily. Through FLAC3D numerical simulation software, the characteristics of surface deformation mechanism under various mining conditions are studied, and the influence factors are obtained. Through sorting out the comprehensive survey data of the study area, the distribution characteristics of the goaf are determined, and the vertical and horizontal displacement law and the internal stress distribution characteristics of the various layers are obtained by using the FLAC3D simulation calculation. With the help of probability integral method, the whole deformation displacement map is obtained, and compared with the numerical simulation of the same area and the result of probabilistic integral calculation, the reliability of the mathematical calculation result is determined, and according to the dividing standard, Carry on the dangerous partition to the whole, draw the partition map.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD325.3
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