基于瓦斯涌出量的煤巷合理掘进速度确定

科学确定掘进速度是保障高瓦斯、突出矿井安全高效生产的重要前提。为确定煤巷最佳掘进速度，减小动力灾害发生，理论分析掘进工作面前方瓦斯分布规律，并建立瓦斯涌出量数学模型，分析不同掘进速度下瓦斯涌出特征。以山西汾西矿区金晖万峰煤矿为例，分析其巷道瓦斯涌出规律，确定其最佳掘进速度。结果表明:煤巷掘进速度v等于应力迁移速度v_σ，即以v=v_σ持续掘进时，落煤瓦斯涌出量Q₁不变，瓦斯涌出总量Q不变；当v < v_σ持续掘进时，Q₁线性减小，Q也持续减小；当v>v_σ持续掘进时，Q₁呈指数增加，Q持续增加；金晖万峰煤矿1115工作面区域应力迁移速度约为2.1 m每班次，以2.1 m每班次持续掘进或分别以每班次2.4、1.6、2.4 m速度循环掘进时，能够实现煤巷快速安全掘进。在该矿1115工作面进风巷对研究结果进行现场验证并证实了该方法的可行性。 

Gas emission-based determination of the reasonable driving speed in coal roadway

Scientific determination of the tunneling speed is an important prerequisite for the safe and efficient production in coal mines with high gas and outburst. In order to determine the reasonable driving speed of coal roadway and reduce the occurrence of dynamic disasters in coal roadway driving, the distribution law of gas in roadway head was analyzed, the mathematical model was established. Gas emission characteristics were also analyzed at different driving speeds based on the model. Taking Jinhui Wanfeng Coal Mine as an example, the reasonable driving speed was determined in this coal mine based on its gas emission characteristics. Results show that when the driving speed is equal to the stress migration speed(v=v_σ), the gas emission of fallen coal and the total gas emission are all constant; when the driving speed is less than the stress migration speed(v < v_σ), the gas emission of fallen coal decreases linearly, the total gas emission decreases continuously; when driving speed is greater than the stress migration speed(v>v_σ), the gas emission of fallen coal increase exponentially, the total gas emission decreases continuously; The stress migration speed of working face 1115 in Wanfeng Coal Mine is 2.1 m per shift or 2.4 m, 1.6 m and 2.4 m per shift circularly driving, at this speed the roadway can be safely and fast excavated. The research results were proved at inlet airway 1115 and the feasibility of the method was verified.