摘要
某矿西二采区采用无底柱分段崩落法开采,1 546 m分段楔形切割拉槽存在拉槽高度过大导致爆破效果不佳的问题。针对该问题进行了楔形切割拉槽爆破研究。基于RHT本构模型标定矿岩参数,采用LS-DYNA软件,运用流固耦合算法,确定矿岩损伤阈值为0.4;对比分析不同拉槽宽度方案的爆破成槽效果,结果表明:拉槽高度固定为23 m时,矿岩有效损伤率随着拉槽宽度增加呈单峰曲线变化;最佳拉槽宽度为24 m,此时矿岩有效损伤率达到峰值0.692 5。基于该参数设计拉槽方案,现场试验结果表明,爆破成形空间达标率超过85%,爆堆块度分布合理,安息角约40°。
The western No.2 mining area of a certain mine adopts the non⁃pillar sublevel caving in mining,and excessive wedge cut height in the 1546 m sublevel leads to poor blasting effect.To address this problem,blasting with wedge cut was specially studied.Firstly,the rock parameters were calibrated based on the RHT constitutive model and the damage threshold of the rock was determined to be 0.4 by a fluid⁃structure interaction analysis with the LS⁃DYNA software.A comparative analysis of the cut blasting effects with different cut width shows that with the cut height fixed at 23 m,the effective damage rate of the rock presents a unimodal distribution with an increase in cut width.The optimal cut width is found to be 24 m,with which the effective damage rate of the rock can reach a peak value of 0.6925.Based on these parameters,the on⁃site application of designed cutting scheme indicates that over 85%of blast⁃forming space can meet the requirement,presenting a reasonable fragment distribution of muck pile,with the angle of repose at approximately 40°.
作者
陈帮洪
陈星明
武尚荣
费志文
CHEN Banghong;CHEN Xingming;WU Shangrong;FEI Zhiwen(Kunming Engineering&Research Institute of Nonferrous Metallurgy Co.,Ltd.,Kunming 650231,Yunnan,China;School of Environment and Resource,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)
出处
《矿冶工程》
北大核心
2025年第2期47-53,59,共8页
Mining and Metallurgical Engineering
作者简介
陈帮洪(1984-),男,四川乐山人,硕士,助理工程师,主要从事地下采矿及岩石力学方面的研究工作。E-mail:13550815784@163.com。
