【作者】 韩兆明；

【导师】 郭立稳；

【作者基本信息】 河北理工大学 ， 安全技术及工程， 2008， 硕士

【摘要】 在煤与瓦斯突出矿井中,由于煤层透气性差,瓦斯压力大,使得掘进速度非常缓慢,严重影响着矿井安全快速生产。为了解决这个问题,在分析了突出煤体物理力学特性和固流耦合理论的基础上,建立了固流耦合数学模型并研究采用高压水射流掏槽技术以提高掘进速度。根据高压水射流掏槽防突的原理,建立了水射流掏槽工作面的力学摸型,选用FLAC软件对掏槽效果进行模拟,模拟结果显示,水射流槽孔周围应力分布发生改变,水射流槽孔两侧出现应力集中区域,并随着距离的增加,应力逐渐减小,最终接近原岩应力;水射流槽孔上下方出现卸压区域,应力减小,随着距离的增加,应力逐渐变大,最终接近原岩应力;水射流槽孔周围发生向孔道方向的位移,其中槽孔两侧位移最为明显,其次是槽孔上方发生一定位移,槽孔下方位移相对较小;随着槽孔径向方向的延伸槽孔周围向孔道方向的位移将逐渐变小;水射流槽孔头前方应力分布发生改变,形成以槽孔前上方为应力峰值区,随着向前方煤层逐渐延伸,应力逐渐减小的应力集中区域,同时槽孔头处发生向煤层方向的位移;水射流槽孔影响周围区域为以槽孔为中心,半径为2m的圆形区域,槽孔对前方煤层距离约为2m,因为卸压区域的存在,在掏槽过程中可对周围2m圆形区域内的瓦斯进行释放;水射流掏槽的最终目的是为了掘进巷道的开挖,因为水射流槽孔头处距离前方应力集中区域较近,因此在掘进巷道开挖的过程中,不应掘至水射流槽孔头处,应留处2m左右缓冲区域,防止不可控的煤与瓦斯突出的发生。根据模拟结果观察高压水射流掏槽破坏煤体的状况,以及掘进方向上煤体的应力状态的改变状况,达到了指导实际工作的目的,起到了很好的效果。更多还原

【Abstract】 In the mine of coal and gas outburst, the speed of diging tunnel is slow because of the low breathability and heavy compressive stress.Which terribly effect the safety and speediness exploitation. Based on the physics characteristic of outburst coal and the coupling theoretics of flow and solid , The technology of diging hole with high pressure water in order to resolving the problem is introduced.By the elements of digging hole with high pressure water in order to prevent coal and gas outburst, establish dynam model and choose FLAC to make the simulation, The simulation result shows that: The stress around the hole has been changed. The stress increased concentrates on the both sides, decreased with the distance increasing to the original stress; the stress decreased on the top of the model and on the bottom of the model with the distance increase to the original stress. There was around displacement to the hole in the coal, in which the displacement on the both sides is most obvious; the displacement around the hole decreased with the distance increased. The stress changed in the end of the hole. There was an area which the stress increased up to the front of the hole. With the distance increaseing to the end of the hole, the stress decreased to the original stress. At the same time, there was a displacement towards the front of the hole.The hole digged by the high pressure water affect the rotundity area which centers on the hole and radius is 2m, because of the change of the stress, the hole can release the gas distances the hole 2m. The aim digging the hole with the high pressure is to dig the laneway fast and the end of the hole is close to the stress concentrated. So when we are digging the laneway, we should not dig to the end of the hole. We should keep 2m from the end of the laneway to the end of the hole in order to prevent the coal and gas outburst.From the result of mathematical simulation, the displacement and stress change of the rock and coal are shown, which will guide the practice and get a good effect.更多还原