底盘抵抗线对露天台阶底盘平整度的影响

Influence of toe burden on the flatness of open-pit step floor

为了解决露天煤矿深孔台阶爆破底板平整度问题,结合矿山实际,在保持台阶高度、炮孔直径以及炸药品种不变的条件下,采取通过改变底盘抵抗线大小来控制底板平整度。现场试验结果表明:在底盘抵抗线为4.5 m时,台阶底板平整度高差在±50 cm以内,台阶平整度达到了一级标准化煤矿的要求。

In order to solve the problem of floor flatness of deep-hole bench blasting in open-pit coal mines,combined with the actual situation of the mine,the floor flatness is controlled by changing the size of the chassis resistance line under the condition that the bench height,blast hole diameter and explosive type remain unchanged.The field test results show that when the chassis resistance line is 4.5 m,the height difference of bench floor flatness is within±50 cm,and the bench flatness meets the requirements of Class I standardized coal mine.