减振孔在缅甸某露天矿区爆破振动控制中的应用

在露天矿开采过程中,爆破振动达到一定强度时,会带来很多危害.缅甸某露天铜矿附近有一处寺庙,是当地居民重要的礼佛场所,为了降低矿山爆破振动对寺庙的危害,保证项目顺利开展,急需采取施工减振孔等控制措施,同时需在寺庙附近布置测点监测振动速度.本文按照入射地震波所穿越的介质形态分别讨论了预裂缝及减振孔的减振机理,对比分析了施工...

Application of shock absorbing hole in blasting vibration control in an open mining area in Myanmar

When blasting vibration reaches a certain intensity, it will bring a lot of harm. A temple near an open-pit copper mine in Myanmar is an important place for local residents to worship. In order to reduce the damage of mine blasting vibration to the temple and ensure the development of the project, the control measures of shock absorption hole construction were adopted, and at the same time, measuring points were arranged near the temple to monitor the vibration speed. The shock absorption mechanism of pre-crack and shock-absorbing hole is discussed according to the shape of the medium that the incident seismic wave passes through. This paper analyzes the shock absorption mechanism of the shock absorption hole, compares and studies the measured vibration velocity after the construction of the shock absorption hole with different row number, and expounds the attenuation law of blasting seismic wave near the shock absorption hole in this mining area. On the premise of considering the effect of elevation amplification, a theoretical calculation formula of seismic wave intensity that is more suitable for the actual mine is fitted. The actual monitoring shows that after the incident seismic wave passes through the shock absorption hole, the vibration velocity drop amplitude of the measuring point reaches 17%~58%, and the shock absorption effect is obvious. The damping effect is related to the number of damping holes and the vibration velocity of the incident seismic wave, both showing a positive correlation. Engineering practice shows that the construction of vibration damping holes can reduce the harm of mine blasting to temples, effectively reduce the cost of blasting, and resolve some community risks, which has certain economic and social benefits.