定向断裂爆破在综放工作面初采切巷的应用

发布时间：2018-03-29 19:31

本文选题：深孔爆破　切入点：初采切巷　出处：《北京理工大学学报》2017年02期

【摘要】：为解决综放工作面初采期上隅角瓦斯超限问题,采用初采切巷深孔爆破强制放顶的方法充填采空区以缩小工作面有效通风断面,以达到改善初采期间工作面通风状态与提高瓦斯排放效率的目的.但是炮孔间距由于受到初采切巷支护结构的限制往往大大超过预裂爆破经验公式确定的上限,造成预裂效果差的后果.为了选择适合现场使用的增加炮孔间距的最佳爆破方法,应用ANSYS/LS-DYNA软件对不耦合装药、V型刻槽和切缝药包3种爆破方式进行数值模拟,结果显示切缝药包爆破在增加炮孔间距和保护岩壁方面有明显优势,并通过模拟确定了切缝药包的最佳开口宽度.最后,通过在阳泉国阳公司K8205工作面进行超前深孔预裂爆破强制放顶的现场应用,比较爆破前、后和割一刀煤后支柱压力的变化情况,验证了良好的预裂爆破效果.
[Abstract]:In order to solve the problem of gas overrun in the upper corner of fully mechanized caving face during the initial mining period, the method of forced roof caving with deep hole blasting in initial mining and cutting roadway is used to fill the goaf to reduce the effective ventilation section of the face. In order to improve the ventilation state of the working face and increase the gas discharge efficiency during the first mining period, however, due to the limitation of the hole spacing by the supporting structure of the initial mining and cutting roadway, the upper limit determined by the empirical formula of pre-splitting blasting is greatly exceeded. In order to select the best blasting method suitable for field use to increase the distance between the holes, the numerical simulation of three blasting methods of uncoupled charge, V-shaped groove and slit charge package is carried out by using ANSYS/LS-DYNA software. The results show that the explosive package blasting has obvious advantages in increasing the hole spacing and protecting the rock wall, and the optimum opening width is determined by simulation. Finally, Based on the field application of presplit blasting forced roof caving in K8205 face of Yangquan Guoyang Company, the change of props pressure before blasting, after blasting and after cutting coal is compared, and the good effect of pre-splitting blasting is verified.
【作者单位】：太原理工大学矿业学院;
【基金】：山西省回国留学人员科研资助项目(2013-050) 国家教育部高等学校博士学科点专项科研基金联合资助课题(20121402110013)
【分类号】：TD235.4

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