填塞长度对岩体爆破损伤效果的影响研究
Influence of Stemming Length on Damage Effect of Rock Blasting
魏可心 1徐振洋 1王雪松 2闫祎然 1任碧琦1
作者信息
- 1. 辽宁科技大学 矿业工程学院,辽宁 鞍山 114051
- 2. 沈阳工业大学 建筑与土木学院,辽宁 沈阳 110870
- 折叠
摘要
采用数值模拟方法建立单孔装药的爆破模型,采取不同填塞长度模拟并利用Otsu算法进行阈值分割后,提取岩体的破裂面积比、孔隙分形维数、块度数据等进行对比分析,研究填塞长度对深孔爆破损伤效果的影响.结果表明,分形维数和破裂面积比随填塞长度增加呈现先增后降的变化趋势,填塞长度3.0 m时分形维数达到最大值,填塞长度 1.7 m时破裂面积比达到极大值.填塞长度2.2 m左右时碎块数量取得最大值,填塞长度2.0 m时碎块平均面积为最小,填塞长度2.0～2.2 m时可达到较优的岩石破碎效果.随着填塞长度增加,抛出的岩石从小块为主转向大块,位移距离降低.研究成果对爆破作业填塞参数选取具有一定参考价值.
Abstract
The numerical simulation was used to establish a single-hole blasting model,which was then used to simulate the blasting effect with different stemming length.Otsu thresholding technique was adopted for image segmentation,and the data,such as percentage of cracked rock area,fractal dimension of pore structure,and fragmentation of rock mass,were extracted for comparative analysis,so as to explore the influence of stemming length on damage effect under deep-hole blasting.The results show that fractal dimension and percentage of cracked rock area are in an uptrend before falling down as stemming length increases.The fractal dimension reaches the maximum value with stemming length of 3.0 m,and the percentage of cracked rock area reaches the maximum value with stemming length of 1.7 m.Stemming length of 2.2 m can bring the highest number of fragments,and stemming length of 2.0 m can result in the smallest average area of fragments.It is found that the blasting with the stemming length of 2.0-2.2 m can lead to better rock fragmentation effect.As the stemming length increases,the flyrock becomes bigger,and the displacement distance decreases.The research results can be taken as reference in selection of stemming parameters for blasting operation.
关键词
深孔爆破/填塞长度/岩体爆破/裂纹扩展/图像分析/损伤效果Key words
deep-hole blasting/stemming length/rock blasting/crack propagation/image analysis/damage effect引用本文复制引用
基金项目
国家自然科学基金(51974187)
辽宁省教育厅重点项目(LJKZ0282)
出版年
2024
NETL
NSTL
万方数据