环工作面电磁法底板突水监测技术

为了监测煤层底板在工作面回采过程中导含水构造裂隙的实时动态发育情况，避免底板突水事故的发生，提出了利用环工作面电磁法对煤层底板突水进行监测的方法技术。通过数值模拟，研究总结了全空间条件下采煤工作面底板不同空间位置异常体在环工作面电磁法观测方式下的响应特征。设计了环工作面电磁法底板突水监测观测系统，并提出了电磁法突水系数的概念。根据底板下导含水裂隙与工作面底板之间距离的大小将电磁法突水系数划分3个等级：突水提醒阈值Cr、突水警告阈值Cw和突水报警阈值Ca。

Study on encircling face electromagnetic method for monitoring coal face floor inrush

In order to monitor coal face floor water-bearing structure and fissure development in coal mining process and avoid floor water inrush harzard，this paper put forward an encircling face electromagnetic method for monitoring coal face floor water inrush.Through numerical simulation，the study summarized the responses of different position abnormal bodies using encircling face electromagnetic method.The paper presented the design of the encircling face electromagnetic inrush observation system，and put forward the concept of electromagnetic water bursting coefficient.According to the distance between the plate bottom and the water-bearing structure fracture zone，the electromagnetic water inrush coefficient was divided into three level forecast thresholds：water inrush reminding threshold Cr，water inrush warning threshold Cw and water inrush alarming threshold Ca.