含软弱夹层顺层岩体爆破效应模拟试验研究  

Simulation test on blasting effect of the bedding rock with intercalation

作　　者：郝亚飞[1] 李海波[1] 郭学彬[2] 张继春[3] 杨风威[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]西南科技大学环境与资源学院,四川绵阳621010 [3]西南交通大学土木工程学院,四川成都610031

出　　处：《煤炭学报》2012年第3期389-395,共7页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(50574076);国家杰出青年基金资助项目(51025935);国家重点基础研究发展计划(973)资助项目(2010CB732001)

摘　　要：以某石灰石矿采场黏土质夹层物为软弱夹层原料嵌入预制水泥砂浆体制作含软弱夹层的顺层岩体台阶爆破模型,进行了不同爆破条件下含软弱夹层顺层岩体的爆破模型试验。试验结果表明:爆破后将软弱夹层空间展布分为4个区域:爆腔区、压密区、影响区和无扰动区,其中爆腔区、压密区和影响区构成了模型的层裂区;压密区密度随爆源距离的增加呈先增大后减小的规律,最后减小至爆破前密度。模型的层裂范围随软弱夹层含水率、最小抵抗线、爆破药量的增加而增加,随软弱夹层厚度的增加出现先增大后减小的规律。不同药包位置的试验证明,改变炮孔的装药位置可以降低或克服含软弱夹层的岩体的层裂作用。The bedding rock with intercalation for bench blasting model is made by limestone mine clay which embedded in precast cement mortar models.Blasting model test of bedding rock with intercalation were carried out under different blasting conditions.The test results show that the intercalation after blasting is divided into four regions：blasting cavity region,tightness region,affected region and undisturbed region.The blasting cavity region,tightness region,affected region constitute the lamination region.Tightness density increases first and then decreases with source distance,and finally reduces to the density before blasting.The lamination range of the model increases with the increase of intercaltion water content,source distance and explosive dosage.And the lamination range increases at first,and then decreases with the increase of intercalation thickness.The experiment which the explosive cartridge is located at different positions proved that different charge locations in the blast hole can reduce or overcome lamination effect of the bedding rock with intercalation.

关 键 词：软弱夹层 边坡爆破 爆破条件 声波探测 层裂范围 

分 类 号：TD824.2[矿业工程—煤矿开采]