槽波层析成像方法在煤田勘探中的应用--以河南义马矿区为例

Channel wave tomography method and its application in coal mine exploration:An example from Henan Yima Mining Area

在地下煤田的开发中,工作面内的小构造、异常体、煤层厚度变化等是需要解决的关键问题,而槽波探测则为这些问题的解决提供了重要的物探方法.本文对河南义马矿区11061工作面进行槽波透射法测量,在巷道显示的煤层厚度变化为1.5～8m,从理论频散曲线分析速度与厚度关系,确定125Hz频率槽波主要用于观测厚度约为2～5m的煤层厚度变化;有效提取了684个频散曲线,并分别拾取了125Hz时槽波群速度与走时,采用走时层析成像方法获得工作面内煤层速度、厚度以及高应力区分布特征,回采验证了结果的正确性.

It is the key problems to detect the small structure,abnormal body and the coal thickness changes in the development of underground coal mining,and channel wave detecting provides important geophysical exploration methods to solve those problems.Transmission measurement was carried out on 11061 working face mining in Yima Mine.Thickness of coal seam from roadway changes from 1.5 m to 8 m,so it is not suitable for travel-time tomography.From theoretical dispersion curve analysis of velocity and thickness relations,we chose 125 Hz frequency channel wave to image about 2 m to 5 m thickness of coal seam thickness.Calculating the 684 dispersion curves and picking up the group velocity and travel-time at 125 Hz of channel waves respectively,we obtain the distribution of velocity,thickness distribution and stress within working face,and the result is verified by mining.