膏体条带充填开采充填体布置参数研究
发布时间：2018-08-02 16:38
【摘要】：采空区条带充填开采方法是针对煤矿充填成本较高、充填材料来源相对不足所提出的一种将膏体胶结材料部分充入采空区的方法，是一种绿色开采技术，并且采空区条带充填采煤方法可以很好地保护地表建筑物的安全，该方法是科学采矿与矿山绿色开采的重要研究方向。本文针对目前采空区条带充填开采充填参数设计方面的不足，通过理论分析并利用数值模拟研究了条带充填采煤技术的岩层移动机理、条带充填开采所需充填体弹性模量的大小、条带充填采煤技术中条带充填体宽度与充填体间隔宽度存在的关系以及两者的确定方法、地表沉陷预计的方法，主要工作及成果如下： 针对条带充填开采的采煤工作面及条带充填体的布置特点，基于Winkler假设，将条带充填体等效为连续均匀分布的Winkler弹性地基，从而建立条带充填开采整个采空区上方顶板岩层弹性地基薄板力学模型，进而基于能量原理导出了条带充填开采中采空区上方的弹性地基板挠度方程表达式，，并通过系统的分析得出主关键层不发生破断所需满足的临界条件，依据条带充填体的简化关系式得出主关键层不发生破断时所需充填体弹性模量大小以及条带充填体宽度与充填体间距的关系式。 通过将两个条带充填体上方的关键层考虑成四边固支的薄板，计算该薄板的破断距并考虑岩层垮落角从而得出条带充填体之间的间隔带宽度为15m；然后，根据威尔逊两区约束理论得出条带充填体的实际受力大小与其极限强度，并根据确定充填体宽度的稳定性原则、地表变形与充填体布置参数的协调原则、条带充填体宽度与间距满足的关系式确定出条带充填体的宽度为35m。 根据条带充填开采沉陷机理得到地表的最大下沉量主要由充填前顶板移近量、充填欠接顶量、充填条带的压缩量、岩柱压缩量以及关键层的挠度组成，经计算得出地表最大下沉量达到341.71mm；地表同关键层是同步协调运动，因此关键层的变形量即为地表的变形量，经计算得出地表的最大倾斜变形达到1.595mm/m，最大曲率变形为2.67310-5/m，最大水平变形为5.21210-1mm/m，地表建筑物的损坏等级为I级，符合地表建筑物的保护要求。而采用数值模拟软件FLAC3D模拟的结果与理论分析结果吻合，也能满足地表建筑物的保护要求。因此，针对曹村矿的地质条件采用充填35m间隔15m的方案是可行的。
[Abstract]:The method of strip filling mining in goaf is a kind of green mining technology, which is aimed at the high cost of filling in coal mine and the relatively insufficient source of filling material, which partly fills the goaf with paste cementing material. And the goaf strip filling coal mining method can protect the safety of surface buildings well. This method is an important research direction of scientific mining and green mining. In this paper, aiming at the deficiency in the design of filling parameters of strip filling in goaf at present, the mechanism of strata movement of strip filling mining technology is studied by theoretical analysis and numerical simulation. The size of the elastic modulus of the backfill needed for strip filling mining, the relationship between the width of the strip filling and the interval width of the backfill in the strip filling mining technology, the methods of determining the two, the method of predicting the surface subsidence, The main work and results are as follows: according to the arrangement characteristics of mining face and strip filling body in strip filling mining, the strip filling body is equivalent to Winkler elastic foundation with continuous and uniform distribution based on Winkler hypothesis. Thus, a mechanical model of elastic foundation thin plate of roof layer above the goaf is established, and the equation of deflection of elastic ground slab above goaf is derived based on the energy principle. And through the systematic analysis, the critical conditions that the main critical layer does not break are obtained. According to the simplified formula of strip filling, the relationship between the elastic modulus of the main key layer and the width of the strip filling and the space between the backfill and the main key layer is obtained. By considering the key layers above the two strip filling bodies into thin plates fixed by four sides, calculating the breaking distance of the thin plates and considering the falling angle of the rock layers, the width of the interval between the strip filling bodies is obtained to be 15 m; then, According to Wilson's two-zone constraint theory, the actual force size and ultimate strength of strip backfill are obtained, and according to the stability principle of determining backfill width, the coordination principle of surface deformation and packing layout parameters, The relationship between the width of strip filling body and the distance is determined that the width of strip filling body is 35 m. According to the subsidence mechanism of strip filling mining, the maximum subsidence of the surface is mainly composed of the roof moving near before filling, the filling underconnecting roof, the compression of filling strip, the compression of rock column and the deflection of key layer. The maximum subsidence is 341.71mm, and the deformation of the critical layer is the deformation of the earth's surface, so the deformation of the critical layer is the deformation of the earth's surface, so the deformation of the critical layer is the deformation of the earth's surface. The results show that the maximum slope deformation is 1.595mm / m, the maximum curvature deformation is 2.67310-5 / m, the maximum horizontal deformation is 5.21210-1mm / m, and the damage grade of the surface buildings is I, which conforms to the protection requirements of the surface buildings. The results of numerical simulation software FLAC3D are in good agreement with the theoretical analysis results, and can also meet the protection requirements of surface buildings. Therefore, according to the geological conditions of Caocun Mine, it is feasible to adopt the scheme of filling 35 m interval 15 m.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD823.7
本文编号：2160039
[Abstract]:The method of strip filling mining in goaf is a kind of green mining technology, which is aimed at the high cost of filling in coal mine and the relatively insufficient source of filling material, which partly fills the goaf with paste cementing material. And the goaf strip filling coal mining method can protect the safety of surface buildings well. This method is an important research direction of scientific mining and green mining. In this paper, aiming at the deficiency in the design of filling parameters of strip filling in goaf at present, the mechanism of strata movement of strip filling mining technology is studied by theoretical analysis and numerical simulation. The size of the elastic modulus of the backfill needed for strip filling mining, the relationship between the width of the strip filling and the interval width of the backfill in the strip filling mining technology, the methods of determining the two, the method of predicting the surface subsidence, The main work and results are as follows: according to the arrangement characteristics of mining face and strip filling body in strip filling mining, the strip filling body is equivalent to Winkler elastic foundation with continuous and uniform distribution based on Winkler hypothesis. Thus, a mechanical model of elastic foundation thin plate of roof layer above the goaf is established, and the equation of deflection of elastic ground slab above goaf is derived based on the energy principle. And through the systematic analysis, the critical conditions that the main critical layer does not break are obtained. According to the simplified formula of strip filling, the relationship between the elastic modulus of the main key layer and the width of the strip filling and the space between the backfill and the main key layer is obtained. By considering the key layers above the two strip filling bodies into thin plates fixed by four sides, calculating the breaking distance of the thin plates and considering the falling angle of the rock layers, the width of the interval between the strip filling bodies is obtained to be 15 m; then, According to Wilson's two-zone constraint theory, the actual force size and ultimate strength of strip backfill are obtained, and according to the stability principle of determining backfill width, the coordination principle of surface deformation and packing layout parameters, The relationship between the width of strip filling body and the distance is determined that the width of strip filling body is 35 m. According to the subsidence mechanism of strip filling mining, the maximum subsidence of the surface is mainly composed of the roof moving near before filling, the filling underconnecting roof, the compression of filling strip, the compression of rock column and the deflection of key layer. The maximum subsidence is 341.71mm, and the deformation of the critical layer is the deformation of the earth's surface, so the deformation of the critical layer is the deformation of the earth's surface, so the deformation of the critical layer is the deformation of the earth's surface. The results show that the maximum slope deformation is 1.595mm / m, the maximum curvature deformation is 2.67310-5 / m, the maximum horizontal deformation is 5.21210-1mm / m, and the damage grade of the surface buildings is I, which conforms to the protection requirements of the surface buildings. The results of numerical simulation software FLAC3D are in good agreement with the theoretical analysis results, and can also meet the protection requirements of surface buildings. Therefore, according to the geological conditions of Caocun Mine, it is feasible to adopt the scheme of filling 35 m interval 15 m.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD823.7
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