微震监测在新集二矿底板破坏深度中应用

Application of microseismic monitoring in the depth damage of floor in Xinji No.2 Mine

针对我国华北型煤田浅部煤炭资源枯竭,开采逐渐转入石炭系下组煤层,深部开采面临煤系基底高承压、强含水层现状,以新集二矿230102工作面为例,将微震监测技术应用于煤矿底板“下三带”中底板破坏带监测,与经验公式、弹塑性力学方法结合Mohr-Coulomb强度理论、现场实测数据进行对比。梳理了各种研究方法原理及计算过程,突显了微震监测在底板破坏深度监测的优势,可实时反映回采过程中揭露(或隐伏)构造对底板的扰动,探索了一种较为科学的底板岩体活动监测方法,及时提出煤矿底板突水预测。

In view of the depletion of coal resources in the shallow part of the North China coalfield,the mining gradually shifted to the lower Carboniferous coalbed,and the deep mining faced with high pressure and strong water-bearing layer in the coalbed,230102 working face of Xinji No.2 Mine was taken as an example,and the microseismic monitoring technology was applied to the monitor the floor damage zone in the"lower three zones"of the floor.This paper compared empirical formulas,elastic-plastic mechanics methods combined with Mohr-Coulomb strength theory and field measurement data.The principle and calculation process of the various research methods were sorted out,highlighting the advantages of microseismic monitoring in monitoring the depth of floor damage,which can reflect the disturbance by the exposed(or hidden)structure during the recovery process in real time,exploring a more scientific method of monitoring the rock activity of the floor,and provide timely prediction for the water breakout of floor in mines.