摘要
在深孔台阶爆破中,对不同地质条件下的岩体按其可爆性进行分级,是进行爆破参数优选优化,确定合理爆破参数的前提,对提高矿区生产爆破效率,改善爆破效果、降低爆破成本具有重要意义.结合长滩露天煤矿爆破开挖实际,通过现场单孔爆破漏斗试验、岩体声波测试、室内岩石力学试验,获取了岩体体可爆性分级相关指标.基于组合赋权(CWM)和云模型(CM)的可爆性分级方法,对长滩露天煤矿剥离岩体的可爆性进行了分级评价.结果表明长滩露天矿正在剥离爆破的4个平台岩体可爆性为:1130平盘主要分布灰绿色粗砂岩,可爆性为Ⅲ级(中等);1115平盘主要岩性为黄绿色中砂岩,可爆性为Ⅱ级(较难爆);1100平盘是紫红色砂质泥岩,可爆性为Ⅰ级(难爆);1145平盘主要以紫红色泥岩为主,可爆性为Ⅲ级(中等).
Abstract
In deep hole bench blasting,the classification of rock mass under different geological conditions ac-cording to its blastability is the premise for determining and optimizing blasting parameters.It is of great significance to improve blasting efficiency and effect and reduce blasting costs.Combined with the actual blasting excavation of Changtan open-pit coal mine,relevant indexes of rock mass blastability classification were obtained through on-site single-hole blasting crater tests,rock mass acoustic wave tests and laboratory rock mechanical tests.Furthermore,the blastability of stripped rock mass in Changtan open-pit coal mine was classified and evaluated based on the combina-tion weighting(CWM)and cloud model(CM).The results show that the blastability of gray-green coarse sandstone at the 1130 platform is grade Ⅲ(medium).The blastability of yellow-green medium sandstone at the 1115 platform is grade Ⅱ(more difficult to be broken by blasting).The blastability of purple-red sandy mudstone at the 1100 plat-form is grade Ⅰ(difficult to be broken by blasting).The blastability of purple mudstone at the 1145 platform is grade Ⅲ(medium).
维普
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