【作者】 潘辉；

【导师】 刘明举；

【作者基本信息】 河南理工大学 ， 安全技术及工程， 2007， 硕士

【摘要】 水力挤出措施是近年来新兴的一种煤与瓦斯突出防突技术,该措施适应于突出煤层的安全快速掘进。在部分矿区应用表明：该措施施工工程量低、施工安全、防突效果显著、效检超标率低、工作环境得到明显的改善。但是人们对其防突机理的认识还不够深入,对其注水参数的选择还不够合理。本文采用现场工业试验、实验室实验和理论分析相结合的方法,介绍了水力挤出措施的工艺系统及设备选型,在煤与瓦斯突出机理的基础上,结合现场大量的防突效果考察,分析了水力挤出措施的防突机理,然后通过实验模拟的方法,得出了高压水对煤体中瓦斯解吸的作用机理,完善了水力挤出措施的防突机理。研究表明,水力挤出后,工作面前方应力集中带向煤体深部移动,卸压带增宽,巷帮煤体的应力集中程度也得到了缓和,抵抗突出的范围增大；注水过程中由于煤体被压裂疏松,煤体透气性增强,瓦斯得到了较充分的释放,降低了瓦斯含量和压力；注水后高压水具有封堵了瓦斯的作用,使得吸附瓦斯向游离瓦斯转变困难,降低了瓦斯解吸速度和涌出量；注水后煤体被湿润,使得煤体的物理力学性质发生改变,塑性增强,弹性降低。最后采用数量化理论Ⅰ和正交试验设计相结合的数学方法,结合现场实际注水参数和注水效果的考察,得出了注水参数的最佳组合,实现了对水力挤出措施注水参数的优化,更加符合现场实际情况。通过本文的理论分析和现场工业试验证明了水力挤出措施对突出煤层煤巷快速掘进具有广泛的适应性、有效性和安全性。更多还原

【Abstract】 Hydraulic extrusion is a new developing measure against coal and gas outburst in recent years, safe and rapid driving can be implied by this measure in coal bed with outburst potential. The actual results of applying in some mines show that the quantities of construction work are few, construction work is safe, the effective of outburst prevention is significant, the rate of exceeding standard value of validity checking is low, the environment of working face is also improved obviously. But, the mechanism of outburst control is not realized deeply, water injection parameter is not chosen sensibly. In this paper, commercial test of the field, laboratory experiment and theory analyses are used to analyze the procedure of hydraulic extrusion measure. The technology system and equipment of hydraulic extrusion are set forth, based on coal and gas outburst mechanism, and associated with abundant investigations of outburst prevention result; mechanism of outburst prevention of hydraulic extrusion measure is analyzed, then, by the method of experimental simulation, the action mechanism of gas extraction influenced by high pressure water, it perfect the mechanism of outburst prevention of hydraulic extrusion measure. The in-suit experimental results shows that, while adopting the measure of hydraulic extrusion at outburst coal seam, stress concentration region of working face is moved to the depth of coal seam, pressure relief region is widened, and stress concentration degree of upper coal wall is released sufficiently, so, the region of outburst prevention is enlarged. Because coal seams is fractured and loosen by high pressure, gas permeability of coal seam is also enhanced when adopting hydraulic extrusion; free gas contained in the coal seam is released sufficiently, so, gas content and pressure is reduced. High pressure has the effect of blocking gas after adopting hydraulic extrusion, then, adsorbed gas is released hardly, so, the gas extraction velocity is reduced and gas emission is also reduced. When coal is humidified by high pressure water, physical and mechanical quality of the coal is changed, and its plastic nature is enhanced, on the contrary, its elastic nature is descended. At last, with the mathematical method of the theory of quantification I and orthogonal test design, and according to the practical water injection parameter in the field and the investigation of water injection result, the optimum unit of water injection parameter is deduced, and water injection parameter of hydraulic extrusion is optimized, it is complied with the actual condition in the field. By the theoretical analysis and commercial test, hydraulic extrusion measure is demonstrated to have extensive adaptability, availability and security to rapid excavation in seam gateway with outburst potential.更多还原