摘要
针对煤层深孔预裂爆破爆生应力波能量弱、信噪比低的现状，为了给爆孔的装药结构提出合理的改进方案，本文建立了耦合和不耦合装药情况下爆孔孔壁爆炸载荷和透射波能量的计算模型，并利用Matlab软件获得了解析解。同时在淮南矿业集团潘三矿进行了耦合装药系数ξ对爆生应力波能量影响的现场实验，利用改进的基于功率谱的能量分析法对现场实验数据进行分析。理论数值计算及现场实验均表明：应力波总能量随ξ增大而减小；当ξ=1.5时，应力波信号在10-50Hz区间的低频能量最强，信噪比最高，增透效果最佳。
Deep-hole presplit blast technology provides an effective solution for intensified promoting permeability of high-gas and low-permeability coal-beds. In this paper, aimed at background of weak energy and low SNR of stress waves generated by deep-hole presplit blast in coal-bed, a reasonable improvement solution is put forward. A numerical model for calculating explosive load on explosive drilling-hole's wall and transmitted wave energy is built under the condition of coupling charge and non-coupling charge, and analytical solution is acquired by programming code in Matlab software. Meanwhile, on-site experiments are carried out to acquire the impacts of coupling charge coefficient ξ on the energy of stress waves generated by blast in Pansan Coal Mine of Huainan Coal Group, and improved energy analysis method based on power spectrum is used to analyze experimental data. Both theoretical calculations and on-site experiments show that: the total energy of stress waves decrease as the increase of ξ; when ξ=1.5, stress waves have strongest low frequency energy and highest SNR in the frequency range of 10~50Hz. So, in the practice of promoting permeability using deep-hole presplit blast, coupling charge coefficient ξ should be designed as 1.5, and this can acquire the best permeability promoting radius and effect.
出处
《应用力学学报》
CAS
CSCD
北大核心
2014年第3期332-337,485-486,共6页
Chinese Journal of Applied Mechanics
基金
国家科技重大专项(2011ZX05064)
国家自然科学基金(51304006)
安徽省教育厅重点项目(KJ2011A075)
安徽理工大学青年骨干培养基金(20120012)
关键词
深孔预裂爆破
应力波
爆轰能量
增透
deep-hole presplit blast,stress wave,explosive energy,promoting permeability
