铁矿巷道周边定向断裂爆破机理及现场试验研究
投稿时间:2020-05-06  修订日期:2020-05-13  点此下载全文
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作者单位E-mail
王 渝 北京科技大学土木与资源工程学院 13882655505@163.com 
陈帅志 中国五矿集团有限公司  
赵 勇 北京科技大学土木与资源工程学院  
郭 洋 北京科技大学土木与资源工程学院  
骆浩浩 中国矿业大学北京力学与建筑工程学院  
基金项目:国家自然科学基金重点项目“爆炸荷载下巷道围岩的损伤演化与控制基础”(51934001)
中文摘要:为研究切缝药包定向断裂爆破技术在硬岩巷道的适用性,分别通过双孔普通药包及切缝药包数值模拟,铁矿巷道半断面现场试验进行对比,并利用多重分形谱参数对现场试验结果进行定量化评价。试验结果表明,切缝药包能量分配更合理,聚能效果明显,有利于裂纹贯通。半断面对比试验中,切缝药包效果优于普通药包,半眼痕率达80%。普通药包周边爆破爆破后围岩多重分形谱的开口宽度△α、维差△f分别为0.222和0.123,切缝药包周边爆破爆后围岩多重分形谱的开口宽度△α和维差△f分别为0.057和0. 016,多重分形谱非对称指数IAS绝对值分别为0.774和0.122。研究结果表明:切缝药包周边爆破定向断裂效果明显,围岩表面更为光滑平坦,此定向断裂技术同样适用于铁矿巷道等硬岩巷道。
中文关键词:切缝药包  铁矿巷道  多重分形  数值模拟
 
Study on the mechanism and field test of directional fracture blasting of iron mine tunnel surrounding
Abstract:In order to study the applicability of directional fracture blasting technology with slotted cartridge in hard rock tunnel, the blasting effects of normal cartridge and slotted cartridge were compared by numerical simulation and field test of iron mine tunnel, and the field test results were quantitatively evaluated by using multifractal spectrum parameters.The test results show that the energy distribution of the slotted cartridge is more reasonable and the energy cumulative effect is obvious, which is conducive to crack penetration.In the field comparison test, the effect of slotted cartridge was better than that of the normal cartridge, and the rate of half-hole marks was more than 80%. After blasting with normal cartridge , the opening width of wall rock multifractal spectrum △α and dimension difference △f were 0.222 and 0.123, respectively, and after blasting with slotted cartridge , the △α and △f were 0.057 and 0.016, respectively. The value of the asymmetric index IAS of multifractal spectrum was 0.774 and 0.122, respectively. The results show that the directional fracture effect of the surrounding blasting with the slotted cartridge is obvious and the surrounding rock surface is smoother and flatter. The directional fracture technique is also applicable to the hard rock tunnel such as the iron mine tunnel.
keywords:slotted cartridge  iron mine tunnel  multifractal  numerical simulation
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