钻孔水射流冲击煤岩损伤特性模拟研究

张少奇; 高亚斌; 曹敬; 韩培壮; 郑豪; 任杰

钻孔水射流冲击煤岩损伤特性模拟研究

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出版历程
- 发布日期: 2022-10-19

Simulation study on damage characteristics of coal impacted by drilling water jet

摘要

摘要: 钻孔水射流增透技术是当前解决煤层透气性的有效措施，然而目前关于煤层钻孔在水射流冲击作用下的损伤特性问题研究尚不明确；针对该问题，利用非线性显示动力学LS-DYNA软件对射流冲击煤层钻孔损伤破坏过程进行模拟，研究其在不同条件下的损伤特性。结果表明，水射流速度对煤岩钻孔冲击深度有显著影响，射流速度越大，冲击深度越深，在400 m/s水射流速度下，煤岩冲击坑深度超过200 m/s水速度冲击坑深度10倍；围压能够抑制煤岩钻孔冲击范围向深部扩展，随围压持续增加，抑制作用减弱，同时，在围压作用下，煤岩钻孔破坏的有效应力峰值相应增加；水射流直径是决定煤岩破坏范围重要因素，随水射流直径增加，冲击坑沿深部和两侧均有所扩展，同时随水射流直径持续增加受水垫效应影响随之变大，沿深部扩展趋势减缓；钻孔尺寸对煤岩的损伤破坏及裂纹扩展有显著影响，钻孔直径越小，煤岩破碎坑范围越大，同时裂纹扩展形式随钻孔尺寸增加开始由以两侧发展为主的环状裂纹转变为沿深部扩展的纵向裂纹。
- 水射流 /
- 煤层增透 /
- 煤岩损伤 /
- 破坏特性 /
- 裂纹扩展
Abstract: Drilling water jet permeability enhancement technology is an effective measure to solve the permeability of coal seam. However, the research on the damage characteristics of coal seam drilling under the impact of water jet is still unclear. Aiming at this problem, the nonlinear display dynamics LS-DYNA software is used to simulate the damage and failure process of jet impacting coal seam drilling, and its damage characteristics under different conditions are studied. The results show that the jet velocity has a significant effect on the impact depth of the coal rock drilling. The higher the jet velocity is, the deeper the impact depth is. When the jet and coal parameters are constant, the confining pressure can restrain the coal rock drilling impact range from expanding to the deep. Confining pressure continues to increase, and the inhibitory effect is weakened. At the same time, under the action of confining pressure, the effective stress peak value of coal rock drilling failure increases accordingly; the diameter of water jet is an important factor in determining the damage range of coal rock. At the same time, with the continuous increase of the diameter of the water jet, it becomes larger under the influence of water cushion effect and slows down along the deep expansion trend; the size of the drill hole has a significant impact on the damage and crack growth of the coal rock, and the smaller the diameter of the drill hole is, the larger the range of coal and rock crushing pits, and the crack propagation pattern changes with the increase of drill hole size.
- water jet /
- coal seam permeability improvement /
- coal and rock damage /
- failure characteristic /
- crack propagation

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