厚松散层重复采动下地表沉陷移动规律研究

发布时间：2018-04-02 22:01

本文选题：厚松散层　切入点：重复采动　出处：《安徽理工大学》2016年硕士论文

【摘要】：随着矿产资源的日益紧缺,重复采动成为一种重要的采动方式,对此进行研究,具有重要的理论和实际意义。本文以淮南某矿为研究背景,建立地表移动观测站,在现场实测的基础上,对研究区1个首采面和5个复采面地表移动观测数据进行处理分析,结合相似材料模拟实验和数值模拟分析,明确了厚松散层重复采动条件下地表移动变形规律：厚松散层重复采动影响下,覆岩应力变化剧烈,关键层破断加剧,激活了初采的“潜在下沉量”,转化为地表下沉；地表最大倾斜值、曲率最大值、最大水平变形值均增大；起动距明显减小,超前影响角、最大下沉速度滞后角、边界角和移动角均减小；地表移动初始期较短,活跃期较长,衰退期略短；地表下沉总量大于单独开采各煤层下沉量的总和,地表水平移动总量大于单独开采各煤层的水平移动量总和；下沉系数增大,水平移动系数减小,地表移动范围增大。同时,在分析相似材料模拟实验和数值模拟结果的基础上,探讨了覆岩关键层对岩层移动的控制作用,揭示了地表下沉系数大于1的内在机理。研究结果旨在为以后相关地质条件下的重复采动地表移动变形规律研究提供参考。
[Abstract]:With the increasing shortage of mineral resources, repeated mining has become an important mining method, which has important theoretical and practical significance.In this paper, a ground surface movement observation station is set up in Huainan mine as the research background. On the basis of the field measurement, the surface movement observation data of one first mining face and five complex mining faces in the research area are processed and analyzed.Combined with simulation experiments of similar materials and numerical simulation analysis, the law of surface movement and deformation under the condition of repeated mining of thick loose layer is clarified: under the influence of repeated mining of thick loose layer, the stress of overburden rock changes sharply, and the fracture of key layer intensifies.The "potential subsidence" of the first mining is activated and converted into the surface subsidence; the maximum slope value, the maximum curvature value and the maximum horizontal deformation value of the surface are increased; the starting distance is obviously reduced, the leading influence angle is reduced, and the lag angle of the maximum subsidence velocity is increased.The boundary angle and moving angle are both reduced, the initial period of surface movement is shorter, the active period is longer, the decline period is slightly shorter, the total surface subsidence is larger than the sum of the subsidence of each coal seam.The total amount of surface horizontal movement is larger than the sum of the horizontal movement of each coal seam mining alone, and the subsidence coefficient increases, the horizontal movement coefficient decreases, and the surface movement range increases.At the same time, on the basis of analyzing the simulation experiments and numerical simulation results of similar materials, the controlling effect of the key strata of overburden on the strata movement is discussed, and the intrinsic mechanism of the subsidence coefficient greater than 1 is revealed.The results of the study are intended to provide a reference for the study of surface movement and deformation law of repeated mining under related geological conditions.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD325

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