采空区膏体充填材料特性的实验研究及充填开采数值模拟

发布时间：2018-05-24 19:14

本文选题：膏体充填 + 充填材料　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：煤炭是我国重要的能源资源,其结构占能源资源的近百分之七十。然而,“三下”压煤问题却严重制约着我国煤炭行业的发展。若不能有效解决,将严重浪费国家能源,而且会给煤矿企业造成严峻的就业压力等问题。膏体充填开采作为绿色开采技术的重要组成部分,既可以实现不迁村采煤,又可以控制地表下沉,是释放“三下”压煤的有效开采方法。膏体充填开采控制地表沉陷的技术关键是充填材料的强度和长期稳定性,为此论文通过室内实验对膏体充填材料的原材料性质、充填料浆工作特性、充填体力学特性等进行了深入研究；以本溪彩屯矿801工作面膏体充填开采为实例,采用FLAC~(3D)数值模拟软件对膏体充填开采进行了数值模拟研究,取得以下主要成果：(1)自燃煤矸石、粉煤灰特性研究：通过筛分实验获得煤矸石颗粒级配,级配良好,符合充填骨料的要求；通过激光粒度分析仪获得粉煤灰主要粒径为0.46μm～30.76μm；通过X-射线衍射分析仪(XRD)分析出粉煤灰中含大量玻璃体；通过X-射线荧光光谱分析仪(XRF)分析出粉煤灰的化学成分中SiO2A1203.Fe203三者含量共占总含量的89.47%,符合作充填材料的基本要求。(2)水泥矿物成分及水泥胶砂实验研究：通过XRD知对水泥早期强度起主要贡献的硅酸三钙和铝酸三钙含量较多；水泥胶砂实验实测水泥3d强度为16.96MPa,28 d强度为40.59 MPa,3 d强度是28 d强度的41.78%,早期强度较高。(3)膏体充填料浆工作特性实验研究：通过测定膏体充填料浆塌落度、扩展度、分层度及泌水率值来反应膏体充填料浆的工作特性,得出膏体塌落度与扩展度随粉煤灰掺量、细矸率的增加呈先缓慢上升后下降的趋势,随水泥掺量和质量浓度的增加呈下降趋势；分层度与泌水率随粉煤灰掺量、水泥掺量、细矸率和泌水率的增加呈递减的趋势。(4)膏体充填体力学特性的实验研究：通过测定膏体立方体抗压强度来反应膏体充填体的力学特性,得出抗压强度随着粉煤灰掺量、水泥掺量和质量浓度的增加而增加,随细矸率的增加,强度先增加后下降。且粉煤灰掺量及水泥掺量对膏体中后期强度影响较大,质量浓度对早期强度影响显著,细矸率对膏体发展的整个过程都有影响。(5)运用FLAC~(3D)数值模拟软件,结合本溪彩屯矿801工作面膏体充填开采地质采矿条件,建立了数值模型,模拟充填开采后的地表沉陷,获得了工作面地表沉降值,并将模拟结果和实测结果进行了对比分析。
[Abstract]:Coal is an important energy resource in China, its structure accounts for nearly seventy percent of the energy resources. However, the "three under" coal pressing problem seriously restricts the development of the coal industry in China. If it can not be effectively solved, it will seriously waste the national energy, and will cause serious employment pressure on the coal mining enterprises. The important component of color mining technology can not only realize the non relocation of the village coal mining, but also control the subsidence of the surface. It is an effective method to release the "three under" coal pressure. The key to control the surface subsidence by the paste filling mining is the strength and long-term stability of the filling material. Therefore, the original material of the paste filling material is carried out through the laboratory experiment. The properties of the material, the working characteristics of filling slurry and the mechanical properties of the filling body have been deeply studied. Taking the 801 working face paste filling mining in Benxi color Tun mine as an example, the numerical simulation of the paste filling mining is carried out by FLAC~ (3D) numerical simulation software, and the following main achievements have been obtained: (1) the study of the characteristics of spontaneous combustion coal gangue and fly ash: through the study of the characteristics of the fly ash; The gradation of coal gangue particles is obtained by the screening experiment. The particle size is good and meets the requirements of filling aggregate. The main particle size of fly ash is 0.46 m to 30.76 mu m by laser particle size analyzer; a large number of vitreous bodies in fly ash are analyzed by X- ray diffraction analyzer (XRD); fly ash is analyzed by X- ray fluorescence spectrometer (XRF). The content of SiO2A1203.Fe203 three in the chemical composition is 89.47% of the total content, which is the basic requirement of the cooperative filling material. (2) the experimental study of cement mineral composition and cement mortar: the content of calcium silicate three calcium and aluminic acid three calcium, which is the main contribution to the early strength of cement, is more than that of the cement mortar, and the cement mortar test results on the cement 3D strength of 16.96MPa, 2 8 D strength is 40.59 MPa, 3 D strength is 41.78% of 28 d strength, and early strength is higher. (3) experimental study on the working characteristics of paste filling slurry. By measuring the collapse degree, expansion, delamination and bleeding rate of the paste filling slurry, the work characteristics of paste filling slurry are measured, and the collapse degree and expansion of the paste with the fly ash content and the fine waste rate are obtained. The increase of cement content and mass concentration decreased with the increase of cement content and mass concentration; the stratification and bleeding rate decreased with the amount of fly ash, cement content, the rate of fine waste and the rate of bleeding. (4) the experimental study on the mechanical properties of paste filling body: by measuring the cube compressive strength of the paste body According to the mechanical properties of the paste filling body, it is concluded that the compressive strength increases with the increase of fly ash content, cement content and mass concentration. With the increase of the rate of slender gangue, the strength first increases and then drops. The whole process has influence. (5) using the FLAC~ (3D) numerical simulation software and combining the geological and mining conditions of the 801 working face paste filling in Benxi color Tun mine, a numerical model is set up, the surface subsidence after the filling mining is simulated, the surface subsidence value of the working surface is obtained, and the simulation results and the measured results are compared and analyzed.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD823.7

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