炮孔间距对切缝药包爆生裂纹扩展规律的影响  

Influence of the interval between holes on crack propagation in slit charge blasting

作　　者：岳中文[1] 田世颖 陈志远 YUE Zhongwen;TIAN Shiying;CHEN Zhiyuan(School of Mechanics and Civil Engineering,China University of Mining and Technology（Beijing）,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《岩石力学与工程学报》2018年第11期2460-2467,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金面上项目(51374210)~~

摘　　要：为研究炮孔间距对切缝药包爆生裂纹扩展的影响,采用爆破加载数字激光动态焦散线实验系统和数值模拟相结合的方法,对比分析孔间爆生裂纹在不同炮孔间距下的扩展规律。结果表明:随着炮孔间距的增加,孔间爆生主裂纹不再表现为直接贯穿,而是发生偏转呈现"牵手状"分布;爆生主裂纹在扩展过程产生明显波动,且在裂纹相遇区该波动行为更为显著;爆生主裂纹扩展速度、动态应力强度因子的峰值以及裂纹相遇区的应力峰值均取决于炮孔间距,炮孔间距较小时,峰值较大,有利于裂纹的定向扩展。The influence of different intervals between holes of explosive load on the crack propagation was investigated through the dynamic caustics test and numerical simulation. With the increasing of the intervals between holes,the explosive cracks show no direct penetration any more,rather the deflection of cracks occurs in a ＂hand in hand＂ shape. With the increasing of the intervals between holes,the cracks propagation oscillates in the process of expansion and the oscillation is more notable in the area that cracks meet. The peak values of the propagation velocity of main cracks,the stress intensity factor and the stress at the area of cracks meeting all depend on the interval between holes. If the interval between holes is smaller,the peak values is larger,which is beneficial to the directional fracturing.

关 键 词：数值模拟 切缝药包 炮孔间距 动态焦散线 裂纹扩展 

分 类 号：O242[理学—计算数学]