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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 mechanism of coal blasting and improve the gas drainage effect, the fracture of coal blasting damage in theory is divided into the initial stage of blasting wave effect and the later stage of blasting gas and gas, and the two stages According to the similarity theory, the simulation experiment of blasting damage law of coal body was designed and the ultrasonic wave velocity (calculating the damage parameter) and the explosion strain wave of the test block were tested. The experimental results show that the simulated blasting damage of coal body is blast shock wave, explosion stress wave , As a result of the synergistic effect of the emerging gas and gas, gas plays an active role in the entire process of blasting damage. In the vicinity of the explosive source, the blasting wave is the main cause of blasting damage, and the blasting damage is almost in the form of an explosion wave The decay rate decreases rapidly. In quasi-static zone, quasi-static gas and gas are the main causes of blasting damage. The blasting damage decreases slowly and can last a long time at a relatively high level. The blasting in coal Damage extent and damage than the average rock larger.