【摘要】 顶板覆岩破坏是造成回采工作面突水的主要原因之一,利用矿井电法进行顶板电阻率监测可以对覆岩破坏情况进行动态探查,但是超大采高工作面顶板电阻率监测面临着常规方法音频信号难以穿透、顶板监测电极埋设施工困难以及回风巷顶板监测电极难以保护等问题。为了解决上述问题,利用音频电透仪和回采工作面电阻率监测系统开展了超大采高工作面顶板电阻率监测可行性试验研究。结果显示:单极–偶极装置音频信号透视穿透距离可达340 m;锚杆可以作为监测电极进行电流发射和信号采集;可以将回风巷监测电极布置于巷道底板加以保护。在某矿超大采高工作面部署了回采工作面电阻率监测系统,信号测试结果与可行性试验的结论一致。更多还原

【Abstract】 The failure of roof overburden is one of the main reasons for water inrush in mining working face. Roof resistivity monitoring by mine electrical method can be used to detect overburden failure dynamically. However,roof resistivity monitoring for super-high mining face has many problems, such as audio electromagnetic signal by conventional methods is difficult to penetrate through wide working face, burying of roof monitoring electrodes is difficult, monitoring electrode in the roof of air return lane is hard to protect, and so on. In order to solving these problems, feasibility study of roof resistivity monitoring for super-high mining face is carried out by audio electromagnetic perspective instrument and working face resistivity monitoring system. Experiment result shows: perspective distance of audio electromagnetic signal by pole-dipole arrays can be 340 m; anchor bolt can be used as monitoring electrode for current transmission and signal acquisition; monitoring electrodes of the return air way can be arranged on the way floor for protection. On the basis of above research, a resistivity monitoring system for mining working face is arranged for a super high mining face. The signal test results are consistent with the feasibility test results.更多还原