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1.序言 在下西里西亚煤田中开采含瓦斯煤层的最大危险无疑是二氧化碳和甲烷的意外突出。这种危险主要是由于掘进巷道时破坏了岩石的应力平衡,巷道周围积聚的动态应力突然分解,同时还因原始煤体中相当数量的岩石和瓦斯发生位移所造成的。 按保安规程规定:在有岩石和瓦斯突出危险的煤层中掘进时,每次推进之后。都应测量工作面的瓦斯压力。在含二氧化碳的煤层中当瓦斯压力超过30千帕或在含甲烷的煤层中瓦斯压力超过81千帕时便可以认为有瓦斯和岩石突出危险。 1977年巴尔巴拉试验矿井与下西里西亚煤矿设计院合作,着手工作,旨在通过负压抽放岩层瓦斯,确定减少突出可能性。 特霍莱斯和瓦乌勃瑞赫矿井已用上述测量结果防止突出危险、提高矿井通风质量。
1. Introduction The greatest danger of mining gas-bearing coal seams in the Lower Silesian coalfield is undoubtedly the unexpected prominence of carbon dioxide and methane. This danger is mainly due to the destruction of the rock stress balance when driving the roadway, the dynamic stress accumulated around the roadway suddenly decomposed, and also caused by the displacement of a considerable amount of rock and gas in the original coal. According to the provisions of the security regulations: In the rock and gas outburst dangerous coal in the tunneling, after each propulsion. Should measure the face of gas pressure. Methane and rock are considered to be a significant hazard when the gas pressure exceeds 30 kPa in methane-bearing coal seams or gas pressures in excess of 81 kPa in methane-bearing coal seams. In 1977, the Barbara piloted mine, working in cooperation with the Lower Silesian Coal Mine Design Institute, commenced work aimed at pumping out rock gas by negative pressure and identifying possibilities of reducing prominence. The Tolhuolles and Waublech coal mines have used the above measurements to prevent prominence and increase mine ventilation.