煤体爆破损伤规律模拟试验研究  

Experimental Study on the Blast Damage Law of the Simulated Coal

作　　者：褚怀保[1] 杨小林 梁为民[1] 余永强[1] 王立平[1] 

机构地区：[1]河南理工大学土木工程学院,河南焦作454000 [2]洛阳理工学院,河南洛阳471023

出　　处：《采矿与安全工程学报》2011年第3期488-492,共5页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(50874039;40638040);河南省科技攻关项目(0624210002);河南省煤矿瓦斯与火灾防治重点实验室开放基金项目(HKLGF200705);河南理工大学杰出青年基金项目

摘　　要：为进一步研究煤体爆破作用机理,提高瓦斯抽放效果,从理论上将煤体爆破损伤断裂分为爆炸波作用的初始阶段和爆生气体与瓦斯气体作用的后期阶段,并确定了两个阶段的断裂损伤准则.根据相似理论设计了煤体爆破损伤规律模拟试验,测试了试块超声波波速(计算损伤参量)和爆炸应变波,试验结果表明,模拟煤体爆破损伤是爆炸冲击波、爆炸应力波、爆生气体和瓦斯气体共同作用的结果,瓦斯气体在爆破损伤的整个过程中都起着积极作用;在爆源近区,爆炸波是形成爆破损伤的主要原因,爆破损伤几乎以爆炸波的衰减速度迅速减小,而在中远区,准静态爆生气体和瓦斯气体是形成爆破损伤的主要原因,爆破损伤减小速度缓慢,且能在一较高水平持续较长时间;煤体中爆破损伤范围和损伤程度较一般岩石大.In order to further study the coal blasting mechanism and improve the gas drainage effect in coal mine,we analyzed the process of coal blasting damage and fracture and divided it into the initial stage of blast waves and the later stage of the detonation gas and coal mine gas,then we selected the damage and fracture criterion.Based on the similarity theory,we designed coal blast experiment and measured ultrasonic wave velocity and blast strain waves.The results show that the coal blast damage is the result of the interaction of blast shock wave,blast stress wave,and detonation gas and coal mine gas.The coal mine gas has a positive role in the coal blast damage.Near the blasting area,the blast wave is the main reason of blast damage,which makes the blast damage decrease rapidly.However,in the area at a moderate or long distance from the blast point,the main reason of blast damage is detonation gas and coal mine gas,the blast damage decreases slowly,and the damage can last a long time at a high level,The damage range and degree of the blast are greater than general rock.

关 键 词：煤体 爆破损伤 爆炸应力波 模拟试验研究 

分 类 号：TD235.1[矿业工程—矿井建设]