文献类型：期刊文献

中文题名：岩石爆破破碎能耗随抵抗线的变化规律

英文题名：An investigation of energy consumption variation in rock blasting breaking with the resistance line

作者：雷振 张智宇 黄永辉 周继国 白莹

第一作者：雷振

通信作者：Huang, Yonghui

机构：[1]贵州理工学院矿业工程学院,贵州贵阳550003;[2]昆明理工大学国土资源工程学院,云南昆明650093;[3]昆明理工大学电力工程学院,云南昆明650500;[4]中国有色金属工业昆明勘察设计研究院有限公司实验中心,云南昆明650051

第一机构：贵州理工学院矿业工程学院

年份：2021

卷号：41

期号：7

起止页码：47-56

中文期刊名：爆炸与冲击

外文期刊名：Explosion and Shock Waves

收录：CSTPCD;;EI(收录号：20213010678013);Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：国家自然科学基金(52064025,51664007)。

语种：中文

中文关键词：破碎块度;爆炸能;能耗利用率;分形维数

外文关键词：fragmentation;energy explosion;energy efficiency;fractal dimension

摘要：针对爆炸荷载下岩体破碎块度和有用功能耗及能耗利用率问题,运用断裂力学、分形基础理论分析和模型实验等方法,对爆炸荷载下岩体破碎块度和能耗利用率随最小抵抗线的变化规律开展了系统的分析研究。研究结果表明:在模型实验条件下,破碎块度分形维数在1.2~1.7之间,随最小抵抗线增大呈现较好的线性衰减趋势;破碎能耗随最小抵抗线呈现先增加后降低的趋势,爆炸能量利用率在4.57%~12.51%之间,趋势与能耗值一致,模型实验中能耗利用率存在最大值;破碎块度与能耗利用率变化趋势相反,说明在最小抵抗线变化过程中存在一个最佳值,使得破碎块度和能耗利用率均处于最优状态,模型实验中这一最佳值为160 mm,是装药直径的26.7倍。该研究结果可为提高爆炸能利用率理论分析及工程中降低大块率的设计和施工提供理论依据。
The topics such as fragmentation degree,active energy consumption and energy consumption efficiency of rock mass under explosive load have attracted increasing attention in recent years.However,it is very difficult to conduct such research due to its instantaneity,high temperature and high pressure characteristics.Systematic analysis and research on broken blocks of rock mass and the variation of energy utilization under explosion load with the different minimum resistance lines have been carried out.Plain concrete material was used to construct the model and carry out the model experiment.Theory of energy consumption in fracture mechanics was used to calculate the crushing energy.The basic fractal theory was used to calculate and analyze the fragmentation distribution law.Research results indicate that:the fractal dimension of broken blocks is between 1.2 and 1.7,exhibiting a good linear attenuation trend with the increase of the minimum resistance line from 120 mm to 200 mm;the crushing energy consumption increases first and then decreases.More specifically,the crushing energy consumption is 440.0 J at 120 mm,and increases to the maximum of 1106.5 J at 180 mm,and then decreases to 1084.8 J at 200 mm.The explosive energy utilization rate is between 4.57%and 12.51%and the maximum value corresponds to the minimum resistance line of 180 mm,the variation trend is consistent with that of the energy consumption value.The trend of broken fragmentation and utilization rate of energy consumption is opposite.There is an optimum minimum resistance line,corresponding to the optimized fragmentation degree and energy consumption utilization rate,in the model experiment is 160 mm which is 26.7 times the diameter of the charge.The research results can provide a theoretical basis for improving the explosive energy utilization rate and guide the design and construction processes in future engineering applications.