露天开采环境中地面振动阈值的建立——以实例为例

Sk Yomekpe-Agbeno, M. Affam
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引用次数: 0

摘要

为了评估爆破活动对加纳露天矿区建筑结构的影响,在加纳西部地区非常靠近Bogoso Gold Ltd(现为Golden Star Resources Bogoso/Prestea Mines)北厂矿坑周边的Prestea镇进行了一项研究。在研究过程中观察到,在Prestea镇及其周边地区,大多数住宅建筑结构的质量普遍低于标准。大多数房屋年久失修,状况堪忧。有人再次指出,没有记录可以确定在坑内开始爆破活动之前建筑物的结构状况,因此有必要对附近希曼镇的建筑物进行基线研究,以便进行比较分析。还观察到,尽管管理部门选择12毫米/秒作为其在坑中操作的阈值,但在两年半期间监测的542次爆炸中,只有6%的地面振动值超过1.5毫米/秒,最大记录值为8毫米/秒。由于周围社区的基础设施较差,建议管理层不应采用超过2毫米/秒的地面振动水平进行基坑作业。尽管这种水平会大大增加钻井和爆破成本,但在可能对城镇建筑结构造成进一步损害的情况下,这被认为是比昂贵的诉讼更好的选择。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Establishing Ground Vibration Threshold Level for Open Pit Mining Environment - A Case Study
To assess the impact of blasting activities on building structures in open pit mining districts in Ghana a study was carried out in Prestea, a township very close to the perimeter of the Plant North pit of the Bogoso Gold Ltd (now Golden Star Resources Bogoso/Prestea Mines), in the Western Region of Ghana. It was observed during the study that the quality of most 'residential building structures within the Prestea township and its environs were generally sub-standard. Most of the houses were in a deplorable state of disrepair with their conditions already triggering failure. Again, it was noted that no records were available to ascertain the structural state of the buildings prior to the commencement of blasting activities at the pit, necessitating the need to carry out a baseline study of buildings in nearby Himan townships for comparative analysis. It was also observed that even though management had selected 12 mm/s as its threshold for its operations in the pits only 6% of the over 542 blasts monitored over a two and half year period had ground vibration values in excess of 1.5 mm/s, with a maximum recorded value of 8 mm/s. It is recommended that management should not adopt ground vibration levels in excess of 2 mm/s for their pit operations because of the poor infrastructure within the surrounding communities. Even though this level can increase drilling and blasting costs considerably, it is considered a better option than expensive lawsuits in the likely event of any further damages that may be caused to building structures in the township.
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