摘要
煤体破碎范围是松动爆破中的重要评价指标。为探究煤体单孔爆破破碎范围的影响因素,本文采用ANSYS/LS-DYNA有限元软件建立二维单孔爆破数值计算模型,研究炮孔半径、不耦合系数、炸药密度、抗拉强度等因素与煤体破碎的关系。研究结果表明:粉碎区与裂隙区的范围随装药半径的增加而增大;炮孔装药半径增大,粉碎区范围与装药半径的比值基本不变,裂隙区范围与装药半径的比值逐渐减小;随不耦合系数增大,粉碎区范围逐渐减小,裂隙区范围呈先增大后减小趋势;当炸药波阻抗与煤体波阻抗相同时,粉碎区范围较大,炸药密度增加,裂隙区范围呈先增大后减小趋势;抗拉强度增加,煤体粉碎区与裂隙区范围都减小,裂隙区范围变化量高于粉碎区。上述研究结论对煤矿预裂爆破参数设计具有一定的指导意义。
The crushing range of coal mass is an important evaluation index of loosening blasting.To research the influencing factors of the crushing range of coal mass in single-hole blasting,this paper uses ANSYS/LS-DYNA finite element software to establish a two-dimensional numerical model,in order to study the relationships among factors such as blast hole radius,decoupling coefficient,explosive density,tensile strength and coal mass crushing.The research results show that:the ranges of the crushed zone and the fractured zone increase with the increase of charge radius;with the increase of blast hole charge radius,the ratio of the crushed zone range to the charge radius remains basically unchanged,but the ratio of the fractured zone range to the charge radius decreases gradually;when the decoupling coefficient increases,the range of the crushed zone decreases gradually,and the range of the fractured zone shows a trend of increasing first and then decreasing;when the wave impedance of the explosive is the same as that of the coal mass, the range of the crushed zone is relativelylarge, and with the increase of explosive density, the range of the fractured zone presents a trend of increasing first and thendecreasing;with the increase of tensile strength, both the ranges of the crushed zone and the fractured zone of coal massdecrease, and the variation of the fractured zone range is higher than that of the crushed zone. The research conclusions abovehave certain guiding significance for the design of presplit blasting parameters in coal mines.
作者
刘斌斌
聂国豪
LIU Binbin;NIE Guohao(Ili Yongning Coal Chemical Industry Co.,Ltd.,Ili 835000,China;School of Mechanics&Civil Engineering,China University of Mining and Technology,Xuzhou 221008,China)
出处
《煤矿爆破》
2025年第4期1-8,15,共9页
Coal Mine Blasting
关键词
煤体
单孔爆破
破碎范围
数值模拟
coal mass
single-hole blasting
crushing range
numerical simulation
