煤层底板破坏带电阻率法异常特征研究

Study on Resistivity Abnormal Characteristics of Coal Seam Floor Failure

我国大约60%的煤矿不同程度受到奥灰水的影响,研究承压水上采煤引起的底板破坏规律对于煤矿安全开采具有十分重要的意义。本文对电阻率法探测井下底板破坏带视电阻率异常特征进行研究。应用商业电法正反演软件EarthImager 3D设计工作面推进过程中底板破坏带地质模型,利用混合边界条件下有限差分法进行正演模拟,并分析其异常特征和分布规律。正演结果表明,电阻率法能探测出底板破坏带异常,随着工作面的推进,在视电阻率剖面图上异常体的位置出现相应的移动。

About 60% coal mines were affected by Ordovician limestone groundwater in our country, so it is important to study on coal seam floor failure regularity caused by coal mining above limestone with pressurized water. This paper discussed resistivity abnormal char- acteristics of coal seam floor failure. It designed the models of coal seam floor failure at several process of the coal face propelling and did some forward simulations with the mixed boundary condition and finite difference modeling method by EarthImager 3D. The results showed that the resistivity abnormal characteristics of coal seam floor failure could be detected, and the positions of anomalous bodies were changed related to the coal face propelling in apparent resistivity pseudosections.