爆破筑坝形成自然反滤结构的块度研究

Studies on the Block Size of Natural Filter Layer for Blasting

人工控制爆破块度，使爆堆体形成一个从上游到下游由细逐渐变粗的块度结构，构成坝体的自然反滤结构，从而省去人工反滤层的铺设工作，达到既拦蓄泥石又通畅透水的目的，是治理泥石流的一个新的课题￣［１］。笔者在爆前对爆破漏斗范围内被裂隙切割的岩石形成的天然块度进行了认真地统计分析，深入了解了爆堆的构造情况，选择合理的爆破参数并精心设计布置药包，取得了坝体自然反滤结构的预期结果，为定向爆破筑坝治理泥石流开创了一个新的途径。

Based on the study of the effect of the blast parameters on the rock fragrnentation,theblasted block size of rock is theoretically controlled. Thus , the blocks in the blasting fill dam distributed from small to large along the seepage direction act as a filter and a lot of construction work can besaved.This results of research had been applied successfully in another blasting fill dam.