BOTDR分布式光纤传感技术在充填法采矿模型试验中的应用

Application of Distributed Optical Fiber Sensor Based on BOTDR in the Model Tests of Backfill Mining

为研究司家营铁矿南区开采过程中采场稳定性以及地表沉降情况,选取一个盘区所在的剖面进行物理力学模型试验,并引入布里渊散射光时域反射技术(BOTDR)对开采过程中模型内部的应变进行监测。试验结果表明模型总体呈稳定状态,采场顶板和地表沉降量较小,矿柱应变变化平稳,阶段空场嗣后充填法开采是可行的。BOTDR传感技术对模型变形监测十分有效,其分布式、精度高、易布置、不易受开采扰动等优点,可以作为模型试验监测技术加以推广。

In order to study the stability of stope and the subsidence of ground surface during the course of mining in southern district of Sijiaying iron mine, one section of mining panel was selected to do the physical and mechanics model test. The distributed optical fiber based on BOTDR was used to monitor the strain of model. It was indicated that the BOT- DR-based distributed detection technique for the model was quite effective. Test results show that the model is stable, the movement of stop roof and ground surface is less,the change of strain in the pillar is stable,Bench open stoping and subsequent filling mining is feasible. There were obvious advantages for BOTDR such as distributing, high precision, easy layout, strong anti-interference,and it was a very potential technique for simulation experiment.