Detection technique and application of transmission in-seam wave in thin coal seam
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摘要: 为提高透射槽波探测技术在薄煤层中对断层的解释精度，根据槽波在薄煤层中吸收衰减严重，传播距离近的特点，提出采用槽波最远传播距离来约束CT成像的方法。通过理论推导，研究不同煤层厚度条件下槽波频率的变化情况；以1.5 m煤层为主要研究对象，正演模拟槽波的衰减特性，确定1.5 m煤层中槽波的有效传播距离为300 m。对山东某矿15号煤层的槽波资料，应用该技术CT成像，解释的断层和巷道揭露推断的断层位置基本吻合。结果表明：对1.5 m煤层的槽波资料处理时，以300 m为最大有效传播距离，对实际数据进行能量衰减成像，提高了槽波CT成像质量和解释精度。该方法可为薄煤层槽波探测技术提供借鉴意义。Abstract: Aiming at the problem of serious attenuation of channel wave in thin seam and its limited distance of propagation, a method of restricted CT imaging was proposed by using the furthest in-seam wave propagation distance. Firstly, the variation of in-seam wave frequency with different thickness of coal seam was studied by theoretical derivation. Taking a 1.5m thin seam as the main research object, the attenuation characteristics of channel wave were simulated by forward modeling, and the effective propagation distance of channel wave was determined. The actual data of No. 15 coal seam in a coal mine in Shandong Province shows that the channel wave propagation distance is about 300 m. For the in-seam wave data of seam 15 in a coal mine in Shandong Province, the fault position interpreted from CT imaging using the technology coincided basically with that exposed by roadway. When processing the in-seam wave data of 1.5 m thick coal seam, with 300 m of propagation distance as the constraint condition to conduct the energy attenuation imaging on actual data, the channel wave CT imaging quality and interpretation accuracy were improved. This method takes into account the propagation characteristics of channel waves in thin coal seam, reduces the influence of attenuation, and highlights the anomalies caused by structural factors. It is useful for the development and application of thin seam channel wave detection technology.
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Keywords:
- thin coal seam /
- transmission in-seam wave /
- energy attenuation /
- velocity filtering /
- fault /
- CT imaging
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