聚合物粉末改性水泥基封孔材料的实验研究
发布时间：2018-11-06 15:03
【摘要】：钻孔预抽瓦斯是煤炭安全开采的保障。在我国,钻孔瓦斯抽采效果普遍较差,统计显示,在65%左右的回采工作面中,其瓦斯抽采浓度低于30%。钻孔密封的好坏,直接影响了瓦斯预抽的效果,而钻孔密封的好坏主要取决于封孔材料。因此,对新型封孔材料的研究尤为重要。有机-无机复合的聚合物改性水泥基材料可兼具聚合物及水泥材料的优点,但是目前在井下封孔的应用和研究很少,现有的有机-无机复合的聚合物改性水泥基材料以单一聚合物改性、乳液类聚合物改性材料居多。基于此,本文通过理论研究、实验室实验的手段,对多种聚合物粉末复掺其它填料共同改性进行研究,开发了一种新型聚合物粉末改性水泥基封孔材料,以期将其应用于煤矿井下,进一步提升井下瓦斯抽采钻孔的封孔质量,提高瓦斯抽采浓度。取得主要研究成果如下:(1)采用理论研究的方法,在目前钻孔密封漏气失效机理研究的基础上,提出材料析水率对封孔效果影响这一概念,并建立了析水率-漏气量模型;分析了水泥基材料反应机理及材料复合界面理论,并计算了在保障水泥硬化结石强度下的水泥成分的最优配比。(2)基于聚合物粉末改性水泥基封孔材料的研发,确定了封孔材料的初始水灰比,研究了水溶性聚合物粉末和可再分散性聚合物粉末的掺加对水泥浆液析水率、粘度和宏观形貌的影响,同时利用SEM和FTIR从机理方面解释了聚合物粉末的添加在影响材料宏观性能的方面所起的作用。(3)研究了水溶性聚合物粉末、可再分散性聚合物粉末和粉煤灰复掺对材料抗压强度的影响;同时通过分形盒维数从细观角度研究封孔材料的力学行为,即研究封孔材料在围岩应力场的作用下其裂纹产生和发展的动态演化过程,这对更全面揭示钻孔密封失效漏气机理与封孔材料的优化研究具有重要的理论价值和工程指导意义;对比研究了三种封孔材料的密封性能,检验了所研发的新型聚合物粉末改性水泥基封孔材料的模拟封孔性能,为该材料在现场钻孔密封的应用奠定了实验基础。研究生阶段相关研究成果发表中文核心期刊1篇,共申请专利11项,其中8项发明专利处于实质审查阶段,3项实用新型专利已授权。
[Abstract]:Borehole pre-drainage of gas is the guarantee of coal mining safety. In our country, the effect of borehole gas drainage is generally poor. Statistics show that the concentration of gas drainage is lower than 30% in about 65% of mining face. The effect of gas pre-drainage is directly affected by the hole sealing, and the hole sealing is mainly determined by the sealing material. Therefore, the study of new sealing materials is particularly important. The organic-inorganic composite polymer modified cement-based materials can have the advantages of both polymer and cement materials, but there are few applications and researches in downhole sealing at present. The existing organic-inorganic composite polymer modified cement-based materials by single polymer, emulsion polymer-modified materials are the majority. Based on this, a new kind of polymer powder modified cement-based sealing material was developed by means of theoretical research and laboratory experiments, in which a variety of polymer powders were mixed with other fillers. The purpose of this paper is to apply it to the underground coal mine to further improve the hole sealing quality and the concentration of gas drainage. The main research results are as follows: (1) based on the current research on the failure mechanism of gas leakage in borehole seal, the concept of the influence of material water evolution rate on the sealing effect is put forward, and the model of water evolution rate and gas leakage rate is established. The reaction mechanism of cement-based materials and the theory of composite interface are analyzed, and the optimum proportion of cement components under the strength of cement hardened stones is calculated. (2) Research and development of cement-based sealing materials based on polymer powder, The initial water-cement ratio of the sealing material was determined, and the effects of the addition of water-soluble polymer powder and redispersible polymer powder on the water evolution rate, viscosity and macroscopic morphology of cement slurry were studied. At the same time, SEM and FTIR were used to explain the effect of the addition of polymer powder on the macroscopical properties of the material. (3) the water-soluble polymer powder was studied. The influence of redispersible polymer powder and fly ash on the compressive strength of the material; At the same time, through the fractal box dimension, the mechanical behavior of the sealing material is studied from the view of meso, that is, the dynamic evolution process of crack generation and development of the sealing material under the action of surrounding rock stress field. It has important theoretical value and engineering guiding significance to reveal the mechanism of air leakage and the optimization of sealing materials. The sealing performance of three kinds of sealing materials was studied, and the simulated sealing performance of the new polymer powder modified cement-based sealing material was tested, which laid an experimental foundation for the application of the material in the field drilling sealing. The related research results of the postgraduate stage published one Chinese core journal, in which 11 patents were applied for, of which 8 were in the stage of substantive examination and 3 were licensed for utility model patents.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD712.6
本文编号：2314629
[Abstract]:Borehole pre-drainage of gas is the guarantee of coal mining safety. In our country, the effect of borehole gas drainage is generally poor. Statistics show that the concentration of gas drainage is lower than 30% in about 65% of mining face. The effect of gas pre-drainage is directly affected by the hole sealing, and the hole sealing is mainly determined by the sealing material. Therefore, the study of new sealing materials is particularly important. The organic-inorganic composite polymer modified cement-based materials can have the advantages of both polymer and cement materials, but there are few applications and researches in downhole sealing at present. The existing organic-inorganic composite polymer modified cement-based materials by single polymer, emulsion polymer-modified materials are the majority. Based on this, a new kind of polymer powder modified cement-based sealing material was developed by means of theoretical research and laboratory experiments, in which a variety of polymer powders were mixed with other fillers. The purpose of this paper is to apply it to the underground coal mine to further improve the hole sealing quality and the concentration of gas drainage. The main research results are as follows: (1) based on the current research on the failure mechanism of gas leakage in borehole seal, the concept of the influence of material water evolution rate on the sealing effect is put forward, and the model of water evolution rate and gas leakage rate is established. The reaction mechanism of cement-based materials and the theory of composite interface are analyzed, and the optimum proportion of cement components under the strength of cement hardened stones is calculated. (2) Research and development of cement-based sealing materials based on polymer powder, The initial water-cement ratio of the sealing material was determined, and the effects of the addition of water-soluble polymer powder and redispersible polymer powder on the water evolution rate, viscosity and macroscopic morphology of cement slurry were studied. At the same time, SEM and FTIR were used to explain the effect of the addition of polymer powder on the macroscopical properties of the material. (3) the water-soluble polymer powder was studied. The influence of redispersible polymer powder and fly ash on the compressive strength of the material; At the same time, through the fractal box dimension, the mechanical behavior of the sealing material is studied from the view of meso, that is, the dynamic evolution process of crack generation and development of the sealing material under the action of surrounding rock stress field. It has important theoretical value and engineering guiding significance to reveal the mechanism of air leakage and the optimization of sealing materials. The sealing performance of three kinds of sealing materials was studied, and the simulated sealing performance of the new polymer powder modified cement-based sealing material was tested, which laid an experimental foundation for the application of the material in the field drilling sealing. The related research results of the postgraduate stage published one Chinese core journal, in which 11 patents were applied for, of which 8 were in the stage of substantive examination and 3 were licensed for utility model patents.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD712.6
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