煤岩体巷道壁面钻孔减震吸能性能研究

发布时间：2018-03-25 14:38

本文选题：壁面钻孔　切入点：减震吸能　出处：《中国安全生产科学技术》2017年04期

【摘要】：为了掌握瓦斯爆炸冲击载荷在煤岩巷道壁面钻孔下的传播衰减规律,揭示煤岩巷道壁面钻孔减震吸能机理,提高巷道系统的安全稳定性能,基于一维平面应力波理论和节理刚度模型分析了煤矿井下巷道围岩钻孔的减震吸能机理,解释了煤岩壁面钻孔的存在对应力波传递的减弱和阻隔作用。为了深入研究巷道壁面钻孔的减震吸能性能,利用ANSYS/LS-DYNA建立方形巷道模型,模型壁面设置有钻孔,针对巷道右壁面和顶板布置相应监测点,对瓦斯爆炸冲击载荷作用下巷道壁面钻孔的减震吸能性能进行了数值模拟。结果表明:由于介质的非连续性和不同介质之间特性存在差异,煤岩体巷道壁面钻孔有效消减了钻孔后煤岩体质点中波的强度及速度,具有一定的减震吸能作用。研究煤岩巷道壁面钻孔在冲击载荷作用下的减震吸能性能,为研究瓦斯爆炸冲击载荷对巷道系统安全性和稳定性提供依据。
[Abstract]:In order to understand the law of propagation and attenuation of gas explosion impact load under coal and rock roadway wall drilling, the mechanism of energy absorption and shock absorption of coal rock roadway wall borehole is revealed, and the safety and stability performance of roadway system is improved. Based on the theory of one-dimensional plane stress wave and the stiffness model of joint, the mechanism of energy absorption of boreholes in underground roadways is analyzed. This paper explains the weakening and blocking effect of corresponding force wave transmission in boreholes of coal and rock face. In order to deeply study the energy absorption performance of boreholes in roadway wall, a square tunnel model is established by using ANSYS/LS-DYNA, and boreholes are arranged on the wall of the model. Corresponding monitoring points are arranged on the right wall and roof of the roadway. The energy absorption performance of boreholes in roadway wall under the action of gas explosion impact load is numerically simulated. The results show that because of the discontinuity of the medium and the difference of the characteristics between different media, The wall drilling of coal and rock roadway effectively reduces the intensity and velocity of the medium wave of coal and rock mass particle after drilling, and has a certain effect of energy absorption and shock absorption. The seismic and energy absorption performance of coal rock roadway wall drilling under impact load is studied. It provides a basis for studying the safety and stability of roadway system under the impact load of gas explosion.
【作者单位】：湖南科技大学资源环境与安全工程学院;湖南科技大学煤矿安全开采技术湖南省重点实验室;
【基金】：国家自然科学基金项目(51374003,51004048) 湖南省自然科学基金项目(2016JJ6038) 湖南省教育厅项目(E51523)
【分类号】：TD353

【相似文献】