露采爆破振动对拟建水库坝体影响研究

Study on the Effect of the Open-pit Blasting Vibration on Reservoir Dam Planned to Be Constructed

某露天采场采用中深孔爆破,采场最终边界附近拟建酸性水库坝体。为了研究露天采场爆破振动对坝体稳定性的影响,首先对露天采场爆破振动进行现场测试,对测试结果进行了回归分析,得到了爆破振动的最大振速公式;其次,根据现场实际情况对坝体处最大振速公式进行了修正;在此基础上,采用数值模拟的方法研究了露采不同时期爆破振动作用下坝体的安全系数。结果表明:露采一期爆破振动过程中,坝体是稳定的;露采二期爆破振动过程中,坝体稳定性较差,提出了降低单段最大药量的技术措施。

The medium-length hole of blasting is applied in an open-pit mine and an acid reservoir dam is planned to be constructed nearby the final boundary of it. In order to study the effect of blasting vibration on stability of the dam, the fMd testing of blasting vibration was carried out and the formula of the maximum vibration velocity was obtained by regres- sion analysis method. Furthermore, the formula of maximum vibration velocity at the dam was modified according to the actu- al engineering environment. Based on this, the safety factor of the dam affected by blasting vibration at different stages of open-pit mining was analyzed by using the numerical simulation~ The results showed that the dam is stable during the first stage of blasting and the dam has a poor stability during the second stage of blasting. The plan of decreasing the maximum explosive dosage at the second stage was proposed.