爆破振动对混凝土初凝期强度影响规律及降震试验研究  

Experimental study on the influence of blasting vibration on the initial setting period of concrete and its shock absorption

作　　者：王亚强[1] 李二宝 王骞 漆斌 汪熙 杨海涛[2,4] WANG Yaqiang;LI Erbao;WANG Qian;QI Bin;WANG Xi;YANG Haitao(China Gold Inner Mongolia Mining Co.,Ltd.,Hulunbuir 021000,China;State Key Laboratory of Safety and Health for Metal Mines,Maanshan 243000,China;Sinosteel Maanshan General Institute of Mining Research Co.,Ltd.,Maanshan 243000,China;Huawei National Engineering Research Center of High Efficiency Cyclic Utilization of Metal Mineral Resources Co.,Ltd.,Maanshan 243000,China)

机构地区：[1]中国黄金集团内蒙古矿业有限公司,内蒙古呼伦贝尔021000 [2]金属矿山安全与健康国家重点实验室,安徽马鞍山243000 [3]中钢集团马鞍山矿山研究总院股份有限公司,安徽马鞍山243000 [4]华唯金属矿产资源高效循环利用国家工程研究中心有限公司,安徽马鞍山243000

出　　处：《中国矿业》2022年第3期124-130,共7页China Mining Magazine

摘　　要：为研究爆破振动对初凝期混凝土结构的影响规律,提出适合于现场应用的降振措施。以某矿山新建破碎站工程为背景,开展爆破振动扰动下的混凝土模型试验,并采用回弹仪测量混凝土强度变化。结果表明:受爆破振动前后,模型试块不同龄期回弹值随爆破振动速度的增大均呈“波浪式”上升走势,且存在一段“加速破坏期”,当模型初凝期为3 d、7 d、14 d、28 d时,“加速破坏期”对应振动速度范围分别为1.34~1.57 cm/s、1.64~2.70 cm/s、2.40~3.50 cm/s、3.90~4.39 cm/s;通过理论计算得出爆破振动速度关于爆源距离、炮孔轴向不耦合系数之间的关系式,结合矿山爆破工艺参数,选取空气层长度1 m和1.5 m两种方案,计算得出相同距离下爆破振动降振率分别为11%和16%,现场试验实际降振率分别为8.99%和17.84%,考虑矿山冲孔现象严重,确定最优空气层长度为1 m。In order to study the influence of blasting vibration on early-age concrete structure,vibration reduction measures suitable for field application are proposed.Based on the new crushing station project of a mine,the concrete model test under blasting vibration disturbance is carried out,and the strength change of concrete is measured by rebound instrument.The results show that before and after blasting vibration,the rebound values of model test blocks at different ages show a“wave”upward trend with the increase of blasting vibration velocity,and there is a“accelerated failure period”.When the initial setting period of the model is 3 d,7 d,14 d and 28 d,the corresponding vibration velocity ranges of“accelerated failure period”are 1.34-1.57 cm/s,1.64-2.70 cm/s,2.40-3.50 cm/s and 3.90-4.39 cm/s;the relationship between blasting vibration velocity and blasting source distance and axial uncoupling coefficient of blast hole is obtained by theoretical calculation.Combined with mine blasting process parameters,two schemes of air layer length 1 m and 1.5 m are selected.The vibration reduction rates of blasting vibration at the same distance are 11%and 16%,respectively.The actual vibration reduction rates of field test are 8.99%and 17.84%,respectively.Considering the serious punching phenomenon of mine,the optimal air layer length is 1 m.

关 键 词：爆破振动 混凝土试块模型试验 不同龄期混凝土 控制措施 

分 类 号：TD235[矿业工程—矿井建设] TU755[建筑科学—建筑技术科学]