The harmfulness and destructiveness of mine gas explosion is quite serious, which is the first of all kinds of coal mine disasters. Once the gas explosion occurs, it could instantly generate explosion shock waves, high temperature airflows, and disaster gases, which cause the destruction of underground ventilation structures, disruption of airflow direction in a mine ventilation network, and miners’ deaths by asphyxiation. As an important barrier to prevent the spread of accidents caused by the gas explosion, the safety and reliability of the mine seal affects the mine’s production and the health of workers. Due to the demands of coal mine production and transportation, a large number of longitudinal and horizontal roadway networks have been developed underground. There are not only many flat and straight roadways in the complex roadway network structure, but also a large number of different types of bifurcations and bends. Once a gas explosion occurs, the impact of the blast waves on the mine seal after passing through the complex path is difficult to determine. Therefore, this paper establishes a numerical model of bifurcated and cornered roadways and studies how the impact of gas explosion shock waves on the structure of sandwich mine seal after passing through different types of bifurcated and cornered roadways. The damage state of sandwich mine seal is analyzed. The researching finding could prevent and manage the spread of gas explosion disaster, and improve the disaster mitigation of mine explosion accident.

矿井瓦斯爆炸的危害性和破坏性相当严重，居各类煤矿灾害之首。瓦斯爆炸一旦发生，会立即产生爆炸冲击波、高温气流和灾害气体，造成井下通风结构破坏、矿井通风管网气流方向紊乱、矿工窒息死亡。矿井密封作为防止瓦斯爆炸事故蔓延的重要屏障，其安全可靠关系着矿山生产和职工身体健康。由于煤矿生产和运输的需要，井下开发了大量的纵向和横向巷道网。复杂的巷道网结构中不仅存在大量平坦、笔直的巷道，而且还存在大量不同类型的分岔、弯道。一旦发生瓦斯爆炸，冲击波经过复杂的路径后对矿井密封的影响很难确定。为此，本文建立了分叉拐角巷道数值模型，研究瓦斯爆炸冲击波经过不同类型的分叉拐角巷道后对夹层矿井密封结构的影响。对夹层矿井封层的破坏状态进行了分析。研究成果可预防和治理瓦斯爆炸灾害蔓延，提高矿井爆炸事故减灾水平。一旦发生瓦斯爆炸，冲击波经过复杂的路径后对矿井密封的影响很难确定。为此，本文建立了分叉拐角巷道数值模型，研究瓦斯爆炸冲击波经过不同类型的分叉拐角巷道后对夹层矿井密封结构的影响。对夹层矿井封层的破坏状态进行了分析。研究成果可预防和治理瓦斯爆炸灾害蔓延，提高矿井爆炸事故减灾水平。一旦发生瓦斯爆炸，冲击波经过复杂的路径后对矿井密封的影响很难确定。为此，本文建立了分叉拐角巷道数值模型，研究瓦斯爆炸冲击波经过不同类型的分叉拐角巷道后对夹层矿井密封结构的影响。对夹层矿井封层的破坏状态进行了分析。研究成果可预防和治理瓦斯爆炸灾害蔓延，提高矿井爆炸事故减灾水平。建立了分叉拐角巷道数值模型，研究了瓦斯爆炸冲击波经过不同类型的分岔拐角巷道后对夹层矿封层结构的影响。对夹层矿井封层的破坏状态进行了分析。研究成果可预防和治理瓦斯爆炸灾害蔓延，提高矿井爆炸事故减灾水平。建立了分叉拐角巷道数值模型，研究了瓦斯爆炸冲击波经过不同类型的分岔拐角巷道后对夹层矿封层结构的影响。对夹层矿井封层的破坏状态进行了分析。研究成果可预防和治理瓦斯爆炸灾害蔓延，提高矿井爆炸事故减灾水平。