煤和瓦斯突出有预兆吗？--杨远锋的博客

煤和瓦斯突出有预兆吗？

[ 2011-1-9 9:22:00 | By: 杨远锋 ]

煤和瓦斯突出前大多数都有预兆，归纳起来分有声预兆和无声预兆。
　　1.有声预兆
　　1)响煤炮。在煤层内发出像机关枪、炮击声。由于条件不同，声音大小、间隔时间也不相同。
　　2)突然压力增大。支柱来劲，发出咔咔的响声，或发出劈裂折断的响声，手摸煤壁能感到冲击和震动；有煤岩层的破裂声；有时会听到气体穿过含水裂缝时的“吱吱”声等。
　　2.无声预兆
　　1)压力增大。预板来压，片帮、掉碴、煤壁向外鼓，煤岩自行剥落。
　　2)煤层发生变化。层理紊乱、变软，暗淡无光，煤层粉碎，煤质干燥。
　　3)瓦斯及温度变化。瓦斯涌出异常，忽大忽小，煤尘增大，气味异常，发闷，打钻时喷煤、喷瓦斯，煤壁发冷，气温下降等。
　　应当指出的是，上述预兆，并不是在每次突出之前都同时出现，而是仅仅出现一种或几种。

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原创

[ 2016-9-6 17:20:05 | By: 原创(游客) ]

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原创

[ 2016-9-28 16:54:20 | By: 原创(游客) ]

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原创

[ 2016-9-30 11:31:11 | By: 原创(游客) ]

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Re:在漫画中识别身边的违章

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Re:在漫画中识别身边的违章

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Re:在漫画中识别身边的违章

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Re:在漫画中识别身边的违章

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Re:在漫画中识别身边的违章

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