煤层波谱特征与瓦斯含量的试验研究
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摘要
为研究煤层频谱特征与煤层瓦斯地质参数间相关关系,选取几个典型矿区的主采煤层,采用矿井震波探测技术进行原位煤体震波波谱探测实验.试验结果表明,煤体波谱特征反映了煤层本身的物理力学性质,同一结构的煤层在其5倍厚度的距离内煤壁的主频值相对稳定,主频的变化反应了煤体结构的特征,结构破坏主频明显低移;不同的煤层具有不同的主频,突出煤层具有低主频特征.煤层瓦斯含量与煤层固有主频成较好的线性相关,煤层固有主频值越低,相应煤层瓦斯含量越高.研究结果可为煤与瓦斯突出预测提供新的方法.
In order to study the relations between seismic wave spectrum and geologiacl parameters of coal seam and gas,Several typical main coal seams under mines are selected,and the spot seismic is made to wave prospect experiments under the condition of the invariable mechanic seismic sources.The result indicates that the seismic spectrum characteristics reflect the physical mechanic property of coal seams.The dominant frequency keeps relative stability within the five times distance of the depth of the coal layer in the same structure.The variance in dominant frequency of coal seams reflects structural change of them,which is mostly lower than that of non-gas-burst ones.There is a good linear relativity between the seam gas content and the dominant frequency,which gas content and its dominant frequency go conversely.The result offers a method for coal and gas outbrust forecast.
In order to study the relations between seismic wave spectrum and geologiacl parameters of coal seam and gas,Several typical main coal seams under mines are selected,and the spot seismic is made to wave prospect experiments under the condition of the invariable mechanic seismic sources.The result indicates that the seismic spectrum characteristics reflect the physical mechanic property of coal seams.The dominant frequency keeps relative stability within the five times distance of the depth of the coal layer in the same structure.The variance in dominant frequency of coal seams reflects structural change of them,which is mostly lower than that of non-gas-burst ones.There is a good linear relativity between the seam gas content and the dominant frequency,which gas content and its dominant frequency go conversely.The result offers a method for coal and gas outbrust forecast.
引文
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[2]冯德益,陈化然.大震前地震波频谱异常特征德研究[J].地震研究,1994,17(4):319-329.
[3]XIANGGANG CHI.The detection of seismic fractured zone by bispectrum and time-frequency analysis[J].The So-ciety of Exploration Geophysicists,2004,142-146.
[4]陈达力.岩石声波谱分析技术研究[R].水利电力部华东勘测设计院科研所,1987.
[5]吕绍林,何继善,李舟波.瓦斯突出地球物理场的响应特征[J].长春科技大学学报,2000,30(1):71-75.
[6]刘天放,李志聃.矿井地球物理勘探[M].北京:煤炭工业出版社,1992.
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