祁南煤矿采动覆岩离层注浆地表沉陷控制研究

发布时间：2018-04-22 22:19

本文选题：离层注浆充填 + 关键层　；参考：《西安科技大学》2017年硕士论文

【摘要】：为了安全开采“三下”煤炭,减少地面沉陷,保护矿区环境,多年来国内外采用了多种不同的开采技术措施,其中,条带开采与采空区水砂充填和矸石风力充填最为常用、有效。离层注浆充填是一种控制地表沉陷的新技术,该技术是通过地面布置钻孔向在岩移过程中覆岩内部形成的离层空洞充填进外来材料来对上覆岩层起到支撑作用,从而降低覆岩向地面的移动变形速度和地表下沉量。离层注浆充填技术的充填区域在采空区上覆岩层间充填而不同于采空区内充填,因此离层注浆充填工作不会影响井下工作面正常生产。但是,目前对于覆岩离层注浆沉陷控制原理还有待进一步研究,且国内针对覆岩离层注浆控制地面沉陷的工程实例也较少。为此,论文采用理论分析、实验模拟和现场应用相结合的手段,对覆岩离层注浆充填减沉机制开展研究。论文选取淮北矿区祁南煤矿某首采工作面作为研究对象,该工作面上方村庄位于煤层切眼一侧,属于“切眼侧局部压煤”,注浆充填控制宽度和注浆终止时段与已往有所不同,该工面煤层采高3.5m,对于注采匹配的控制极为苛刻,上述典型特点在淮北矿区尚属首次。论文首先从理论上对采动覆岩离层发育和充填层位进行研究,然后,基于相似材料物理实验和数值模拟相结合的手段对覆岩离层注浆充填过程进行模拟,分析总结覆岩离层注浆对地表沉降的控制机制。最后,采用理论、实验、工程三者相结合的手段,对地表减沉效果进行评价。实施覆岩离层注浆充填后,注浆充填减沉率达96%,通过现场实测地表水平变形值最大仅为0.5mm/m,远低于“三下”采煤规程中规定的Ⅰ级损坏水平变形临界值2.0mm/m,地表建(构)筑物没有造成任何破坏,达到了安全采煤目的,取得了显著的技术、经济与社会效益。
[Abstract]:In order to safely mine "three down" coal, reduce the ground subsidence and protect the environment of mining area, many kinds of mining technology measures have been adopted at home and abroad for many years. Among them, strip mining and goaf water sand filling and gangue wind filling are the most commonly used. Effective. The grouting filling is a new technique to control the surface subsidence. The technique is to support the overlying strata by placing boreholes on the ground and filling the cavity in the overburden to foreign materials during the course of the rock movement. Thus, the velocity of the overburden moving to the ground and the amount of subsidence are reduced. The filling area of separated layer grouting filling technology is different from that of goaf filling in the overlying strata filling in goaf, so the grouting filling work in separated layer will not affect the normal production of underground working face. However, at present, the control principle of grouting subsidence in overlying strata is still to be further studied, and there are few examples in China for controlling surface subsidence by grouting in overburden strata. In this paper, theoretical analysis, experimental simulation and field application are used to study the mechanism of grouting and reducing subsidence. In this paper, a first mining face of Qinan Coal Mine in Huaibei Mining area is selected as the research object. The village above the face is located on the side of coal seam cutting, which belongs to "cut side local pressing coal". The control width of grouting filling and grouting termination period are different from those of the past. The mining height of this coal seam is 3.5 m and the control of injection and mining matching is extremely harsh. The above typical characteristics are for the first time in Huaibei mining area. In this paper, the development and filling position of strata separated from mining overburden are studied theoretically, and then the grouting filling process of separated strata of overburden is simulated based on the physical experiments of similar materials and numerical simulation. This paper analyzes and summarizes the mechanism of controlling surface subsidence by grouting in separated strata of overburden. Finally, the surface subsidence reduction effect is evaluated by the combination of theory, experiment and engineering. After grouting and filling in separated strata of overburden, The grouting filling reduces the subsidence rate to 96, and the maximum horizontal deformation value of the surface measured in the field is only 0.5 mm / m, which is far below the critical value of the horizontal deformation of grade I damage specified in the "Sanxia" coal mining regulations, and the surface building (construction) does not cause any damage. To achieve the goal of safe coal mining, achieved remarkable technical, economic and social benefits.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD327

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