含瓦斯煤在爆炸荷载作用下的力学特性

Mechanical characteristics of gas-filled coal under blasting load

利用柱状空腔膨胀理论对瓦斯煤在爆炸荷载作用下的力学特进行了研究,给出了空穴膨胀区、塑性区、弹性区应力分布的解析表达式。根据计算结果并结合模型试验和数值模拟对煤体裂纹破裂的机理进行了研究,结果表明,煤体在爆炸荷载作用下的裂纹主要是由于压缩波和卸载波共同作用形成的,爆炸能量主要消耗于破裂区。

Applying the theory of cylindrical cavity expansion, the mechanical characteristics of gas-filled coal were studied. Expressions of stress distribution were expressed in cavity expansion zone, fractured zone, plastic zone and elastic zone. The mechanism of cracks evolution in coal was investigated based on theoretical expressions, numerical simulation and model experiment. The results show that the interaction of compression wave and unloading wave form cracks in gas-filled coal. The main energy of blasting is used to form fractured zone, so the coal have more lager area than rock under blasting loads.