【摘要】：鉆孔預(yù)抽瓦斯是煤炭安全開采的保障。在我國,鉆孔瓦斯抽采效果普遍較差,統(tǒng)計(jì)顯示,在65%左右的回采工作面中,其瓦斯抽采濃度低于30%。鉆孔密封的好壞,直接影響了瓦斯預(yù)抽的效果,而鉆孔密封的好壞主要取決于封孔材料。因此,對新型封孔材料的研究尤為重要。有機(jī)-無機(jī)復(fù)合的聚合物改性水泥基材料可兼具聚合物及水泥材料的優(yōu)點(diǎn),但是目前在井下封孔的應(yīng)用和研究很少,現(xiàn)有的有機(jī)-無機(jī)復(fù)合的聚合物改性水泥基材料以單一聚合物改性、乳液類聚合物改性材料居多�；诖�,本文通過理論研究、實(shí)驗(yàn)室實(shí)驗(yàn)的手段,對多種聚合物粉末復(fù)摻其它填料共同改性進(jìn)行研究,開發(fā)了一種新型聚合物粉末改性水泥基封孔材料,以期將其應(yīng)用于煤礦井下,進(jìn)一步提升井下瓦斯抽采鉆孔的封孔質(zhì)量,提高瓦斯抽采濃度。取得主要研究成果如下:(1)采用理論研究的方法,在目前鉆孔密封漏氣失效機(jī)理研究的基礎(chǔ)上,提出材料析水率對封孔效果影響這一概念,并建立了析水率-漏氣量模型;分析了水泥基材料反應(yīng)機(jī)理及材料復(fù)合界面理論,并計(jì)算了在保障水泥硬化結(jié)石強(qiáng)度下的水泥成分的最優(yōu)配比。(2)基于聚合物粉末改性水泥基封孔材料的研發(fā),確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摻加對水泥漿液析水率、粘度和宏觀形貌的影響,同時利用SEM和FTIR從機(jī)理方面解釋了聚合物粉末的添加在影響材料宏觀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復(fù)摻對材料抗壓強(qiáng)度的影響;同時通過分形盒維數(shù)從細(xì)觀角度研究封孔材料的力學(xué)行為,即研究封孔材料在圍巖應(yīng)力場的作用下其裂紋產(chǎn)生和發(fā)展的動態(tài)演化過程,這對更全面揭示鉆孔密封失效漏氣機(jī)理與封孔材料的優(yōu)化研究具有重要的理論價值和工程指導(dǎo)意義;對比研究了三種封孔材料的密封性能,檢驗(yàn)了所研發(fā)的新型聚合物粉末改性水泥基封孔材料的模擬封孔性能,為該材料在現(xiàn)場鉆孔密封的應(yīng)用奠定了實(shí)驗(yàn)基礎(chǔ)。研究生階段相關(guān)研究成果發(fā)表中文核心期刊1篇,共申請專利11項(xiàng),其中8項(xiàng)發(fā)明專利處于實(shí)質(zhì)審查階段,3項(xiàng)實(shí)用新型專利已授權(quán)。
[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.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD712.6

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王志明;孫玉寧;王永龍;王振鋒;;瓦斯抽采鉆孔動態(tài)漏氣圈特性及漏氣處置研究[J];中國安全生產(chǎn)科學(xué)技術(shù);2016年05期

2 胡勝勇;劉紅威;;煤層瓦斯抽采鉆孔漏氣機(jī)理及應(yīng)用研究進(jìn)展[J];煤礦安全;2016年05期

3 周福寶;孫玉寧;李海鑒;余國鋒;;煤層瓦斯抽采鉆孔密封理論模型與工程技術(shù)研究[J];中國礦業(yè)大學(xué)學(xué)報;2016年03期

4 孫朝蘆;;高水速凝材料在瓦斯抽采鉆孔注漿封孔中的優(yōu)化試驗(yàn)研究[J];中州煤炭;2016年01期

5 楊紹斌;杜斌;;發(fā)泡劑復(fù)配對聚氨酯泡沫封孔材料性能的影響[J];塑料工業(yè);2015年12期

6 劉鳳東;王冬梅;陳佳寧;李趙相;;自乳化型水性環(huán)氧樹脂改性水泥砂漿性能的研究[J];天津建設(shè)科技;2015年05期

7 宋吳兵;林柏泉;郝志勇;孫煒浩;;瓦斯抽采鉆孔新型高水材料封孔性能的研究與應(yīng)用[J];煤炭工程;2015年09期

8 張學(xué)武;;我國煤礦瓦斯抽放存在的問題及對策研究[J];四川水泥;2015年08期

9 周鵬;李同續(xù);;瓦斯抽放用聚氨酯封孔材料放熱問題研究[J];化學(xué)推進(jìn)劑與高分子材料;2015年04期

10 高亞斌;楊威;李賀;郝志勇;李子文;;巖石鉆粉制備注漿材料特性研究[J];煤炭學(xué)報;2015年04期

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