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矿井瞬变电磁法因关断时间影响存在一定探测盲区,一定条件下关断时间长短取决于发射回线边长、等效面积。针对掘进巷道迎头有限空间,设计采用多匝、重叠小边长回线以满足探测深度需要。研究计算表明,40匝、2 m×2 m的发射回线盲区范围为20 m左右,并据此首次提出了矿井瞬变电磁法测点间距选择盲区理论法。基于“烟圈效应”设计了适用于不同巷道条件下的“11点法”矿井瞬变电磁超前探观测系统。该系统随煤/岩层倾角变化而变化。通过推理计算得到了与煤/岩层倾角相关的线框布设角度公式,使该系统更具实际应用价值和指导意义。
Mine transient electromagnetic method due to the impact of off time there is a certain detection blind zone, under certain conditions, the length of the off-time depends on the emission line length, equivalent area. Aiming at the limited headway of tunneling, the design adopts multi-turn and overlapping small side long loop to meet the requirement of exploration depth. The calculation results show that the blind area of transmitting loop of 40 m and 2 m × 2 m is about 20 m, and based on this, the dead-zone theory method of measuring point spacing of mine transient electromagnetic method is proposed for the first time. Based on “smoke ring effect ” designed for different roadway conditions “11 point method ” mine transient electromagnetic advance exploration detection system. The system varies with coal / rock dip. Through the reasoning and calculation, the formula of angle of wire frame layout related to coal / rock dip angle is obtained, which makes the system more practical and instructive.