工作面坑透场强传播规律及有效透视宽度研究

发布时间：2019-01-02 09:27

【摘要】：为求取工作面有效透视宽度,推导了适合坑透仪器实测场强值的工作面坑透实测场强值计算公式,其场强H变化取决于初始场强值H_0、收发距r和吸收系数β。对于相同初始发射场强值的坑透探测,场强传播距离的制约因素为吸收系数值β,β值越小,场强传播距离越大,越适合于坑透探测。提出了利用发射巷近场源区场强数据计算初始场强值,再利用该初始场强值和接收巷透视场强数据计算吸收系数的方法,计算结果比单独的透视场强数据或发射巷场强数据计算更加可靠。提出了煤层工作面坑透有效透视宽度计算公式,由工作面初始场强值、吸收系数值和背景场强值可以计算出坑透探测仪器在某个工作频率探测下的工作面有效透视宽度。淮南矿业集团谢桥矿工作面实际坑透探测资料表明,利用双巷实测的场强数据所计算的初始场强、吸收系数是客观的,由初始场强值、吸收系数值和背景场强值所确定的工作面有效透视宽度值是可靠的,可以合理地指导工作面坑透设计与施工。
[Abstract]:In order to obtain the effective penetration width of the working face, a formula for calculating the measured field strength of the pit penetration is derived. The variation of the field strength H depends on the initial field strength value H0, the transceiver distance r and the absorption coefficient 尾. For the pit penetration detection with the same initial emission field intensity, the limiting factor of the field intensity propagation distance is the absorption coefficient value 尾, the smaller the field intensity propagation distance, the larger the field intensity propagation distance, and the more suitable for the pit penetration detection. A method is proposed to calculate the initial field strength by using the field strength data of the near field source area of the emission lane, and then calculate the absorption coefficient by using the initial field strength value and the perspective field strength data of the receiving lane. The calculated results are more reliable than those of the single perspective field data or the emission lane field strength data. A formula for calculating the effective penetration width of coal seam pit penetration is put forward. The effective penetration width of the pit penetration detector under a certain working frequency can be calculated from the initial field strength, absorption coefficient and background field strength of the working face. The actual pit penetration detection data of Xiaqiao mining face of Huainan Mining Group show that the absorption coefficient of the initial field strength calculated by using the field strength data measured in the double roadway is objective, and the initial field strength is calculated by the initial field strength value. The effective penetration width of the working face determined by the absorption coefficient and the background field strength is reliable and can guide the pit penetration design and construction reasonably.
【作者单位】：安徽理工大学地球与环境学院;
【基金】：国家自然科学基金资助项目(41172137)
【分类号】：TD166

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