河南某石灰石矿是我国少有的裂隙性岩层矿山。这种岩体的可爆性极差,在岩石整体性最差地段,大于600毫米的大块产出率达40％以上,严重影响生产。我们选在该矿做爆破试验,对研究改进爆破工艺具有重要意义。一、裂隙是产生大块的主要因素为了研究产生大块的原因,我们对试验地段的岩石进行了系统的调查,发现最大裂隙间距为5～7米,平均为3米,被裂隙切割而成的“块体”周围充填了大量粘土,因而成为 A limestone mine in Henan Province is one of the rare fractured rock mines in China. This rock mass can be very poorly exploded, yielding more than 40% of the large blocks of more than 600 mm in the worst rock formations, seriously affecting production. We choose to do blasting test in the mine, to study the improvement of blasting process is of great significance. First, cracks are the main factors to produce large pieces In order to study the reasons for the generation of large pieces, we conducted a systematic survey of the rocks in the test site and found that the maximum gap spacing of 5 to 7 meters, with an average of 3 meters, was cut from cracks The “block” is filled with a large amount of clay, thus becoming