瓦斯爆炸冲击-地应力动静载荷下巷道壁面损伤特性

Damage characteristics of roadway wall under dynamic-static loads by gas explosion impact and geostress

为了解决瓦斯爆炸事故中的深部高地应力巷道壁面破坏问题,采用LS-Dyna软件,建立巷道壁面动力响应损伤数学模型和物理分析模型,分析瓦斯爆炸冲击-地应力动静载荷作用下的巷道壁面位移、应力和损伤特征,并研究瓦斯爆炸冲击-不同地应力(水平地应力和垂直地应力)动静载荷下巷道壁面的响应和损伤特性。结果表明:高地应力造成了壁面的初始损伤变形,隅角处的应力集中和初始损伤最大,但是其在瓦斯爆炸过程中,动力响应小于顶板处;在瓦斯爆炸冲击-地应力动静载荷作用下,巷道各个部位的损伤应变随着地应力升高而增加,其中隅角处的损伤度受影响最大且损伤最为严重,其次为顶板位置;地应力升高会使壁面初始损伤变形更为严重,但是明显削弱了爆炸冲击波在围岩中的传播。

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.