工作面底板变形与破坏电阻率特征  

Resistivity characteristic of deformation and failure of floor in workface

作　　者：张朋[1,2] 王一 刘盛东[1,2] 汪志军[1,2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验,江苏徐州221008 [2]中国矿业大学资源与地球科学院,江苏徐州221008 [3]山西国阳新能股份有限公司,山西阳泉045000

出　　处：《煤田地质与勘探》2011年第1期64-67,共4页Coal Geology & Exploration

摘　　要：通过建立回采过程中底板岩层变形破坏过程的地球物理数值模型,采用正演计算方法分析底板破坏带的电阻率变化特征,并在五矿8403工作面布置网络并行电法探测系统,进行现场观测。模拟数据和现场探测结果表明,煤层底板视电阻率值与工作面开采过程密切相关,在回采工作面后方电阻率剖面图出现明显高阻异常,其高阻异常位置与底板破坏位置相对应;在回采工作面前方出现相对低阻异常,其低阻分布位置与矿压引起的高应力区相当;随着工作面的推进,高、低阻异常同步变化。根据这种底板岩石的电阻率变化,结合矿井水文地质特征,可进行煤层底板破坏规律的动态勘探,有利于底板破坏突水的预测预报工作。Through the establishment of geophysical numeric model of rock deformation and failure of coal floor in mining,the characteristics of resistivity variation of destruction zone in coal floor were analyzed by using forward calculation,WBD field monitoring was carried out in the workface of No.5 coal mine.Simulation data and field detection results show that the coal floor resistivity value is closely related with the mining process.High resistivity anomalies appeared behind the workface,the high resistivity anomalies corresponded with the location of deformation and failure of floor.In front of workface low resistivity anomalies appeared,and coincided with the high stress area caused by mine pressure.Along with advance of workface,the resistivity anomalies will be synchronously changed.According to the regularities of floor rock resistivity change,and combined with the hydrogeology characteristics,the dynamic exploration of resistivity method can study the regularities of coal floor deformation and failure and is useful to predict water inrush in floor.

关 键 词：采矿工程 底板破坏 电阻率法勘探 正演模拟 并行电法 

分 类 号：P631[天文地球—地质矿产勘探]