大型土石方爆破工程的钻孔统计分析

为了找出炸药单耗和延米爆破方量的实际值与预算值之间的差别原因,对我国北方一大型土石方爆破工程的钻孔按施工进度进行了统计。并对孔深与延米爆破方量的关系进行了分析。研究发现小于5m深的炮孔数量的比例较大,是降低综合延米爆破方量的一大主要因素。因此得出,缓斜坡的台阶爆破工程中,在孔网参数和台阶高度一定的条件下,通过优化组合,减少浅孔的数量,可以有效地提高项目综合延米爆破方量,从而为缓斜坡台阶爆破降低项目成本指明了方向。

STATISTICS AND ANALYSIS ON BORE-HOLES OF LARGE-SCALED SOIL AND ROCK BLASTING PROJECT

In order to find the deviation of unit explosion consumption and blasting stone quantity of pre-meter between actual value and estimated value.Bore-holes statistics of a large-scaled cubic meter of earth and stone project in north china were carried out according to construction progress.The relation of hole-depth and blasting stone quantity of pre-meter was analyzed.It was found that high proportion of bore-holes less than 5m deep was main factor that induced comprehensive blasting stone quantity of pre-meter.So it can draw a conclusion that comprehensive blasting stone quantity of pre-meter can be increased effectively through optimization and combination and decreasing quantity of shallow bore-holes in the condition of given hole grid parameter and bench height to flat gradient bench blasting project.The conclusion points out direction for reducing cost of flat gradient bench blasting project.