In order to study the wall dynamic response and damage characteristics of deep roadway with high geostress in gas explosion accidents,a mathematical model and a physical analysis model of the roadway wall dynamic response damage were established by using LS-Dyna software,and the numerical model was verified.The displacement,stress and damage characteristics of the roadway wall under the dynamic and static loads of gas explosion impact and geostress were analyzed by numerical simulation.The response and damage change of the roadway wall under different geostress conditions (horizontal geostress and vertical geostress) and gas explosion impact loads were investigated.The results show that high geostress causes the initial damage deformation.The stress concentration and initial damage are greatest at the corner,but its dynamic response is smaller than that at the roof.Under the dynamic and static loads of gas explosion impact and geostress,the damage strain of each part of the roadway increases with the increase of geostress,among which the damage degree at the corners is most affected and most serious,followed by the roof position.The increase of geostress makes the initial damage deformation of the roadway wall more serious,but it obviously weakens the propagation of the shock wave in the surrounding rock.
关键词
瓦斯爆炸冲击/地应力/动静载荷/巷道壁面/损伤
Key words
gas explosion impact/geostress/dynamic and static load/roadway wall/damage
维普
万方数据