【作者】 周大为；

【导师】 王佰顺；

【作者基本信息】 安徽理工大学 ， 安全技术及工程， 2009， 硕士

【摘要】 本文在分析国内外煤层注水技术和松软煤层防片帮技术的研究现状的基础上,运用岩石的破坏机理、强度理论和煤的润湿机理等理论知识,分析研究了松软煤层煤壁浅孔注水防片帮技术的机理,通过实验得出对松散煤体不同含水率条件下的力学性质的变化规律,并进行了现场工业性试验,验证了煤壁浅孔注水防止松软煤层煤壁片帮较好的技术效果。在实验室,对朱仙庄矿Ⅱ863综放工作面煤样进行了松散煤体在不同含水率条件下的力学性质测定试验,并由试验结果得出:煤体的凝聚力和抗剪强度在含水率介于2% ~12%时单调递增,说明一定范围内增加煤体的含水率能够改变煤体的力学性质,有效提高其凝聚力和抗剪强度。在含水率一定的情况下,随着围压的增大,抗剪强度、抗压强度随之增大;而在围压一定的情况下,随着含水率的增大,抗压强度单调下降。通过实验测得,纯水对煤的接触角为69.8°,亲水性较差。为增强煤的润湿性能,提高煤壁浅孔注水润湿煤体的效果,在实验室对添加表面活性剂提高煤的润湿效果进行了实验研究。对实验结果对比分析后,得出在实验的表面活性剂中0.1%的十二烷基苯磺酸钠水溶液对增大Ⅱ863综放工作面煤的润湿性效果最佳。论文研究中,在朱仙庄矿Ⅱ863综放工作面进行了煤壁浅孔注水防片帮技术的现场工业性试验,设计实施了煤壁浅孔注水方案,通过试验最终确定了煤壁浅孔注水的关键技术参数:注水孔间距9.0m,孔深5m,钻孔倾角在30°~40°之间,封孔深度为2.0~2.5m,注水压力为4~8MPa。通过每天早班(即检修班)实施煤壁浅孔注水措施,取得了较好的技术效果及社会经济效益:采煤面煤壁片帮得到有效控制,减轻了工人的劳动强度,提高劳动生产效率;节约了大量的支护材料,降低了吨煤成本;提高了综采面采煤机的开机率,同比月单产由平均5万t/M提高到平均8.8万t/M,增产78%,经济效益显著。更多还原

【Abstract】 Based on analysis about status of coal seam infusion technology and soft coal seam preventing rib spalling technology and used coal’s failure mechanism、strength theory and coal’s wetting mechanism, the mechanism of shallow holes infusion at coal wall preventing rib spalling in soft coal seam was analyzed. Through the experiment of soft coal seam under the condition of different moisture content, analysis of mechanical properties of coal was got. Meanwhile field test was done and effects of shallow holes infusion at coal wall preventing rib spalling in soft coal seam was verified.In the laboratory, the coal samples’mechanical properties determination tests under the condition of different moisture content was done. The coal samples were from Zhuxianzhuang mineⅡ863 fully mechanized coalface. The test results obtained: The coal’s cohesion and shear strength at moisture content between 2% ~ 12% increase monotonically, shows that increasing coal moisture content in certain range can change mechanical properties of coal and effectively improve the cohesion and shear strength. In certain circumstances of moisture content, with confining pressure increasing, the shear strength and compressive strength was increasing. In certain circumstances of confining pressure, with the increase of the moisture content, compressive strength drab monotonically.Through the experiment, the contact angle of coal water is 69.8 degrees and the hydrophilic was poorer. In order to enhance the coal’s wetting and improve the effect of shallow holes infusion to wet the coal, adding surfactants in laboratory to improve coal wetting effect was investigated. After analysis of experimental results obtained in the experiment, surfactant in aqueous acid 0.1% sodium dodecyl stupid to increaseⅡ863 fully-mechanized coal wetting was the best results.In the paper, field test of shallow holes infusion at coal wall preventing rib spalling in Zhuxianzhuang mineⅡ863 fully mechanized coalface was done and the plan of shallow holes infusion at coal wall was designed and implemented. Key technologies of shallow holes infusion at coal wall was confirmed: water hole infusion spacing was 9.0m;deep hole was 5.0 m; dip angle of hole was 30°~ 40°; seal depth was 2.0 ~ 2.5 m; injection pressure was 4 ~ 8MPa. Through every morning (maintenance) implementing shallow holes injection measures, good technical effects and social economic benefits were achieved: The problem of serious rib spalling in mining face was effectively controlled; the labor intensity was reduced; labor productivity was improved; a lot of support materials was saved; the cost of tons of coal was reduced; the home using tv of the mining face coal cutter was improved which increased to 8.8 million tons per month from 5 million and 78% higher than ever.更多还原