前言我矿是地下矿山,选用无底柱分段崩落法采矿。自投产以来,始终存在回采率低,损失贫化率高的问题。主要原因之一是矿体呈粉状、碎块状,节理发育,结构疏松(f=2～6),稳定性差,致使凿岩、装药、爆破效果不良。过去使用CZZ—700凿岩台车配YG—80凿岩机打孔径51～56毫米的采矿炮孔,由于孔径小,爆破后往往使后排炮孔错 Foreword Mine is an underground mine, the selection of non-pillar subsidence caving mining. Since it was put into production, there has always been a problem of low recovery rate and high loss and dilution rate. One of the main reasons is that the ore body is in powdery, fragmented form, with joint development and loose structure (f = 2 ~ 6), and its stability is poor, resulting in poor drilling, charging and blasting effects. In the past using CZZ-700 rock drilling trolley with YG-80 rock drill hit 51 to 56 mm diameter hole blasting mining, due to small aperture, often after blasting blast hole