【作者】 桑培淼；

【导师】 魏锦平；

【作者基本信息】 河南理工大学 ， 采矿工程， 2010， 硕士

【摘要】 松软煤层工作面煤壁片帮严重影响安全生产,煤体注水有利于预防松软煤层煤壁片帮事故的发生,注水对煤壁稳定性强化规律的研究是确定合理注水工艺参数和保证良好工程效果的前提。首先,在分析松软煤层煤壁片帮的力学机理及其影响因素的基础上,采用FLAC3D模拟分析了注水后孔隙水压、注水煤体软化效果和注水范围对工作面前方煤体应力、应变的影响特征:卸压区和塑性区加大,煤体的可压缩量增加,有利于减轻煤壁的片帮破坏,并得出了注水压力和注水孔长度对工作面前方煤体应力、应变的影响规律。其次,通过直接剪切试验研究了含水率、水作用时间对松软煤抗剪强度的影响规律,表明含水率和水煤相互作用时间的合理匹配,可以提高松软煤体抗剪强度。最后,模拟分析了不同注水压力条件下,注水孔径向、轴向饱和度随时间的变化特征,为确定注水压力、注水孔长度和注水时间提供了依据。以注水强化松软煤体煤壁稳定性的规律为基础,确定了郑煤集团(登封)教学二矿31101软煤工作面浅孔注水工艺参数,在强化煤壁稳定性、减小煤壁片帮方面取得了明显的工程效果。更多还原

【Abstract】 Rib spalling in working face of soft seams seriously affected safety production, water injection is beneficial to prevent rib spalling. The law of water injection to strengthen coal wall stability is a premise that determines reasonable injection technological parameters and guarantees good engineering effect.Firstly, based on the analysis of rib spalling’s mechanism and influencing factors, the effect of pore pressure and coal softening caused by injection on stress and strain of coal mass in front of the working face was simulated and analyzed through FLAC3D program. The results showed that the distressed zone, the plastic area and compressible volume of coal mass increased, which is helpful to relieve rib spalling of coal wall. The law of influence of injection pressure and borehole depth on the stress and strain of coal mass in front of the working face was obtained. Secondly, that the effect of water content and water action time on shear strength of soft coal sample was studied by direct shear test, the results showed that reasonable matching water content and coal-water interaction time improved shear strength of soft coal. Finally, the variation characteristics of radial and axial saturation changed with time was simulated and analyzed, which provide the basis for determining injection pressure, borehole depth and injection time.Based on the law of water injection to strengthen stability of soft coal wall, infusion technological parameters of NO.31101 working face in Zhengzhou Coal Group (Dengfeng) Jiaoxue NO.2 Mining Co., Ltd was determined. The rib spalling of soft coal wall was relieved obviously.更多还原