长极距建场电激励下板状体隐患综合特征研究

摘要

To overcome issues of inconvenient power supply in roadways during advanced electric prospecting, complicated data inter⁃pretation etc. thus planned to use surface or borehole power supply long-spaced fixed-source field-building mode to measure potential difference and induced polarizability, according to their anomalous variation determined geological hazards. Taking low-resistivity tab⁃ular body as example, carried out physical simulation, the result has shown that when approach to hidden troubles, measured potential difference and polarizability are all decreasing, the later negative. Using 3D observation, according to contrastive analysis of anomalies in all directions, hidden trouble positioning and real time warning can be realized. The long-spaced fixed-source advanced prospecting has certain resolving capability on anomalous bodies ahead of or near working face, thus adequate for coalmine underground roadway and tunnel advanced prediction.%为克服电法超前探测在巷道内供电不便、数据解译复杂等问题，拟采用地面或钻井供电的长极距大定源建场模式，测量电位差及激发极化率，并依据其异常变化判定地质灾害。为此以低阻板状体为例，进行物理模拟试验。结果表明：在迫近隐患时，测量电位差和极化率均不断减小，且极化率为负值。采用三维观测，根据各个方向的异常对比分析，可以实现对隐患的定位，实现实时预警。这种长极距定源超前探测方法对掌子面前方或附近异常体有一定的分辨能力，适用于煤矿井下巷道以及隧道的超前预报。