煤矿采空区与火烧空区高密度电法探测模拟
Simulation of high density electrical detection of goaf and burnt-out area in coal mine
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摘要: 为了在实际工作中，通过高密度电法探测手段有效识别并区分煤矿火烧空区与采空区的电阻率异常特征；通过建立不同深度的煤矿火烧空区与采空区的二维电阻率剖面模型，并分别对模型进行正演模拟与反演计算分析来实现这一目的。首先通过建立数值模型验证了高密度电法中的温纳装置与偶极装置针对煤矿采空区与火烧区探测时的可行性与有效性；并通过对煤矿采空区异常与火烧空区异常的数值模拟与结果分析，识别并区分了通过高密度电法探测煤矿火烧空区与采空区时产生的电阻率异常差异；最后运用水平向与垂向的一阶导数零值曲线对电阻率拟断面进行了电阻率的特征分析。相较而言：温纳装置对水平向异常的识别能力要强于偶极装置，偶极装置对垂向异常的识别能力要强于温纳装置；而通过对电阻率拟断面进行一阶导数计算，可有效识别、区分电阻率拟断面上的各类电阻率异常特征。Abstract: The purpose of this article is to effectively identify and distinguish the anomaly characteristics of resistivity in the burnt-out area and in the goaf area of the coal mine in the method of the electrical resistivity tomography in the practice work.This article built a two-dimensional resistivity profile model of burnt-out area and the goaf area in different depth of coal mine This model is analyzed in the method of positive simulation and inverse calculation to achieve this research purpose. Firstly, the numerical models is built to verify the feasibility and effectiveness of the Wenner device and dipole device in detecting the coal mine goaf area and burnt-out area, with the method of the electrical resistivity tomography. Secondly, the comparative analysis on the numerical simulation results is conducted to identify and distinguish the anomaly characteristics of resistivity in detecting the burnt-out area and the goaf area of the coal mine, with the method of the electrical resistivity tomography. Finally, the first derivative zero value curves of the horizontal and vertical directions were introduced and used to analyze the characteristics of the resistivity of the pseudo section. In comparison, the Wenner device has stronger recognition ability than the dipole device in horizontal anomaly circumstance, and the dipole device has stronger recognition ability in vertical anomaly circumstance than the Wenner device. The calculation of the first derivative on the resistivity pseudo section can effectively identify and distinguish various types of anomaly characteristics of the resistivity pseudo section.
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Keywords:
- burnt-out area of coal mine /
- goaf /
- high-density electrical /
- Wenner array /
- dipole device
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