尾矿砂爆炸效应实验研究

Experimental Study of Explosion Effect on Tailings Sand

为了研究尾矿砂在爆破振动作用下发生液化及破坏的规律,在实验尾矿库中进行系列爆炸实验研究。将炸药埋设在尾矿库干滩滩面下,爆炸在尾矿库干滩除产生爆破漏斗外,还产生了圆弧形规则裂隙,并伴有冒砂、冒水等破坏现象发生。通过在尾矿库干滩及尾矿库坝体上设置的爆破振动速度和加速度传感器,测得相应的爆破振动速度和加速度,对监测速度及加速度进行数据处理,得到尾矿砂发生液化和破坏的爆破振动速度和加速度值分别为23.94 cm/s和4.38 m/s2。

In order to study the liquefaction and damage of tailing sands under blasting vibration, series of explo- sion experiments were performed in the experimental tailings pond. The explosive charges were buried in the tailings dry beach. Explosions caused blast crater and arc shaped regular cracks, accompanied with sand boil and water erup- tion. The blasting vibration velocity and acceleration sensors were set in the tailings dry beach and dam body to mo- nitor the blasting vibration velocity and acceleration. Regression analyses on experimental data showed that the blas- ting vibration velocity and acceleration of railings sand liquefaction and damage was 23.94 crn/s and 4.38 m2/s, re- spectively, The results provided references for security allowable vibration speed of tailings dam under blasting vibra- tion effect.