水射流割缝深度分析及现场试验研究

Analysis and Field Experimental Research on Water Jet Slotting Depth

针对目前水射流割缝深度无法精确确认的问题,基于动量守恒定律推导二维平面内水射流截面速度分布规律,以水射流射流功率与冲蚀煤岩体积的线性关系、水射流动压衰减规律及Mohr-Coulomb准则等为基础,确定水射流冲蚀煤岩深度随时间的变化规律及水射流割缝的影响范围,并在川南某矿2#煤层2472风巷掘进工作面进行顺层钻孔割缝现场试验,对比计算水射流割缝深度、最大割缝深度。研究结果表明:理论计算值与现场试验实测值之间最大误差分别为8.67%、8.53%。

For the problem that the slotting depth of water jet can not be accurately identified, water jet velocity distribution within the cross section of a two-dimensional plane was derived based on the law of conservation of momentum. And the change laws of water jet scouring coal and rock depth with time and water jet cutting influence scope are determined based on the jet water jet power and linear relationship of coal and rock erosion volume, waterjet flow pressure attenuation law and Mohr-Coulomb criterion.Meanwhile, we carried out the field test of bedding drilling slotting at 2^# coal seam 2472 wind roadway working face of a coal mine in the south of Sichuan, and comparatively calculated the water jet cutting depth and the maximum cutting depth. The results show that the maximum error of the theoretical value and the measured values from field test is 8.67%, 8.53%.