透射槽波探测工作面煤厚的实验与方法研究

发布时间：2018-05-18 18:50

本文选题：槽波 + 层析成像　；参考：《中国矿业大学》2016年硕士论文

【摘要】：煤厚变化是煤矿生产过程中经常遇到的问题,常常由于煤厚变化造成工作面被动改造、跳采搬家、接替紧张等因素影响正常生产,甚至造成人员伤亡和经济损失,因此研究煤厚变化规律,对于指导采掘设计和安全生产具有现实意义。由于地震槽波对煤厚变化比较敏感,而且煤层内传播的槽波频散特征明显,易于识别,因此,地震槽波探测为工作面煤厚探测提供了重要的物探方法。首先,通过对典型“岩-煤-岩”结构中槽波的传播特征进行数值模拟,得到了煤层中槽波传播慢度与煤厚之间的线性数值关系。然后对中国河北省邯郸矿区郭二庄煤矿22204工作面部分区段进行了槽波透射实验,通过时频分析将槽波波列能量包络极值点的走时作为槽波的走时,有效拾取了1750个槽波走时数据,在此基础上,采用走时层析成像方法获得探测区域内煤层慢度以及煤厚分布特征,与实际揭露结果基本吻合。因此,地震槽波作为煤层中传播的导波,能准确的反演煤厚信息,通过时频分析拾取槽波走时的方法保证了探测结果的准确性。
[Abstract]:The change of coal thickness is a common problem in the process of coal production. It is often caused by the change of coal thickness to cause the passive transformation of the working face, the jumping and moving of mining, the tension of replacement and other factors affecting the normal production, and even causing casualties and economic losses. Therefore, it is of practical significance to study the law of coal thickness change for guiding mining design and safety production. Because the seismic trough wave is sensitive to the change of coal thickness and the dispersion characteristics of the channel wave propagating in the coal seam are obvious and easy to identify, the seismic trough wave detection provides an important geophysical exploration method for the coal thickness detection in the working face. Firstly, through numerical simulation of the propagation characteristics of grooves in typical "rock-coal-rock" structures, the linear numerical relationship between the propagation slowness of grooves and coal thickness in coal seam is obtained. Then, the transmission experiment of groove wave is carried out in some sections of 22204 face of Guoerzhuang Coal Mine, Handan Mining area, Hebei Province, China. By time-frequency analysis, the traveling time of the extreme point of energy envelope of trough wave train is regarded as the traveling time of trough wave. On the basis of effectively picking up 1750 channel wave travel time data, the seam slowness and coal thickness distribution characteristics in the detected area are obtained by using the traveling time tomography method, which is in good agreement with the actual exposure results. Therefore, seismic trough wave, as a guided wave propagating in coal seam, can accurately retrieve the information of coal thickness, and the accuracy of detection results is guaranteed by the method of picking up the travel time of trough wave by time-frequency analysis.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD163.1

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