【作者】 周杨洲；

【导师】 王佰顺；

【作者基本信息】 安徽理工大学 ， 安全技术及工程， 2011， 硕士

【摘要】 本文主要对无保护层开采条件下水力冲孔防突技术进行了细致地研究。在深入了解国内外相关领域的研究进展基础上,采用理论分析,实验室实验和现场试验相结合的方法考察了该技术的原理、作用机理、效果等,收到了显著的技术和经济效益。论文根据冲孔作业时煤水作用方式建立并研究了冲击破坏模型,讨论了冲孔时煤体破碎力学机制,即射流对煤体的破坏是剪切和拉伸的共同作用。采用统计损伤的方法结合煤体破坏的方式研究提出了考虑煤体裂隙发育情况的破煤水压阈值,实验室根据煤样的单轴和三轴压缩试验相关数据计算出该值的大小并和生产实际进行对比优化,根据实际应用分析了影响冲孔效果的主要因素。采用边界层理论对冲击破坏系统冲击区流速特性进行了研究,计算得到了最大流速为59m/s；根据冲孔时高速流体冲击煤体的特点引入应力波理论,计算Bllb和B9b煤冲击的最大深度为分别为3m和4m,为优化水力冲孔钻孔布置参数提供了理论依据。根据李嘴孜煤矿煤层实际参数对乳化液泵、钻机等冲孔设备进行了选择,并对冲孔技术参数关系进行了研究,结果表明,出煤量和水压的关系不单纯是正相关关系,出煤速度和冲孔压力大体呈正相关关系,水压增至一定值时出煤速度基本保持不变,该矿最优冲孔水压为10-14MPa。出煤总量随着有效冲孔时间的增加一般保持递增趋势。结合对喷嘴结构参数优化和管路压力损失等计算,得出了水力冲孔时两层煤的最小冲孔泵压分别为13.7MPa和11MPa。根据生产条件制定了冲孔作业安全技术措施、瓦斯通风管理措施,为冲孔作业提供安全的技术保障。在李嘴孜煤矿工业试验时对冲孔前后的瓦斯基础参数以及增透卸压指标进行了细致的考察。图[24]表[18]参[89]更多还原

【Abstract】 The technique of mining conditions without protective layer of coal and gas outburst prevention by hydraulic punching was studied in detail in this paper.The principle of the technology, mechanism of action and effects were investigated with the method of theoretical analysis, laboratory experiments combining with field trials based on in-depth understanding of the progress in related areas of the research, then significant technical and economic benefits were received.Punching and damage model were established and researched according to the way of the coal-water impact in this paper, then crushing type of coal when punching was talked—the destruction of coal by water jet was the effect of shear and tension. Coal fracture pressure threshold under the situation of coal-breaking was obtained by mechanism of coal combined with the methods of statistical damage used uniaxial and triaxial coal compression test data to calculate the value to compare and optimize with actual production, then the main factors affected the punching effects was analysised according to the application. The flow characteristics of impingement area in the system was researched by boundary layer theory and the calculated maximum flow rate was 59m/s; The stress wave theory was introducted and the maximum depth (3.0m of B11b and 4.0m of B9b) of punching was received according to the characteristics of high velocity of punching,. The punching equipment (emulsion pump and rig) was selected according to actual parameters of Lizuizi coal seam and the technical parameters of punching were studied. The results showed that the relationship between coal quantity and water pressure was not simply a positive correlation, the speed of coal out of lanes and punching pressure was a positive correlation, and the rate of coal out of the drilling remained the same when the pressure increased to a certain value. The mine optimal punching pressure was 10～14MPa. The total amount of coal increases with effective punching the time to keep increasing the general trend. Moreover, the minimum pump pressure of the two coal (13.7MPa and 11MPa) when hydraulic punching was obtained under optimization of structural parameters on the nozzle combined with pipe pressure loss by calculation.Punching operation safety precautions and gas ventilation management measures were set down under production conditions, which can provide security technical support for the punching operation. A detailed study on the basis of gas parameters and index of pressure relief as well as increased-permeability before and after punching were researched in Li Zuizi coal mine.Figure [24] table [18] reference [89]更多还原