中部空气间隔不同比例装药对炮孔孔壁受力及碎石块度的影响  

Influence of Charge with Different Proportions under the Condition of Middle Air Separation on the Stress on the Borehole Wall and the Rock Fragmentation

作　　者：林继凯 孙梦迪 刘增辉[2] 赵高明 王世伟 王凡繁 LIN Jikai;SUN Mengdi;LIU Zenghui;ZHAO Gaoming;WANG Shiwei;WANG Fanfan(Shanxi Changzhi Jingfang Coal Industry Co.,Ltd.,Shanxi Changzhi,047100;School of Mining Engineering,Anhui University of Science and Technology,Anhui Huainan,232001;Wuhu Conch Cement Co.,Ltd.,Anhui Wuhu,241200)

机构地区：[1]山西长治经坊煤业有限公司,山西长治047100 [2]安徽理工大学矿业工程学院,安徽淮南232001 [3]芜湖海螺水泥有限公司,安徽芜湖241200

出　　处：《爆破器材》2023年第6期55-64,共10页Explosive Materials

基　　金：国家自然科学基金(51974007,51874002)。

摘　　要：为分析装药中部不同空气间隔位置对炮孔孔壁受力的影响,以Starfield迭加法为基础,得出中部空气间隔装药爆破时整段孔壁上的冲击压力计算公式。在ANSYS-DYNA中建立多组不同中部空气间隔位置的计算模型,对孔壁及周围岩体的受力和损伤度进行分析。最后,进行现场爆破实验,使用WipFrag软件对碎石块度分布的变化规律进行分析。结果表明:中部空气间隔装药爆破时,孔壁压力整体呈现两端大、中间小的分布特征,装药段孔壁受到的冲击压力达到最大,冲击波以8字型向炮孔周围传播。当空气间隔位置在装药段中点时,上、下段药柱周围岩体受力大致相等,碎石块度相对均匀。因此,垂直台阶进行露天爆破开采时,为降低大块和粉料的产生率,空气柱上、下段可进行等比例装药,倾斜边坡可以适当向上调整空气间隔位置。In order to analyze the influence of different air column positions in the middle of the charge on the stress on borehole wall,based on the Starfield superposition method,the calculation formula for the impact pressure on the entire borehole wall during the middle air interval charging blasting was obtained.Multiple calculation models for different central air column positions were established using ANSYS-DYNA,and the stress and damage degree of the borehole wall and surrounding rock mass were analyzed.Finally,on-site blasting experiments were conducted,and the distribution and variation of the fragmentation were analyzed using WipFrag software.The results show that,during the middle air interval charging blasting,the overall pressure on borehole wall shows a large distribution at both ends and a small distribution in the middle.The impact pressure on the borehole wall in the charging section reaches its maximum,and the shock wave propagates around the hole in an 8-shaped pattern.When the air column position is at the midpoint of the charging section,the stress on the rock mass around the upper and lower sections of the charging column is roughly equal,and the block size is relatively uniform.Therefore,when the open-pit blasting mining is conducted on vertical benches,in order to reduce the production rate of large blocks and powder,the upper and lower sections of the air column can be charged in equal proportions,and the air column position can be appropriately adjusted upwards on inclined slopes.

关 键 词：露天爆破 空气间隔装药 孔壁冲击压力 碎石块度 

分 类 号：TD235[矿业工程—矿井建设]