煤矿双层采空区高密度电阻率法正演模拟
Forward Modeling of Coal Mine Double-layer Goaf by High Density Resistivity Method
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摘要: 为了研究在高密度电法温纳装置条件下不同的层间隔的正演模型,得到层间距变化对高密度电阻率法响应的影响规律,分别建立了双层低阻采空区模型(模型Ⅰ)、双层高阻采空区模型(模型Ⅱ)、双层低高阻采空区模型(模型Ⅲ:低阻在上部,高阻在下部)、双层高低阻采空区模型(模Ⅳ型:高阻在上部,低阻在下部)。通过对比分析发现,高密度电阻率法对模型Ⅰ随着层间隔h的增加,不能把异常体的位置区分出来;对模型Ⅱ当2层高阻异常体间隔小于30 m时,不能有效的分辨双层异常体的位置,当层间隔大于40 m时能够有效的分辨出双层异常体的位置和范围;对模型Ⅲ均能显示出异常体的存在但纵向上的位置误差较大;模型Ⅳ能够把上层高阻下层低阻区分开,但不能准确确定下层低阻体的位置。Abstract: In order to study the forward modeling of different intervals between layers by high density resistivity method employing Wenner device and obtain the change of interval between layers on the response of high-density resistivity method, double-layer low-resistance goaf model (modelⅠ), double-layer high-resistance goaf model (modelⅡ), double-layer high-low resistance goaf model (model Ⅲ: high resistance in the upper part, low resistance in the lower part), double-layer low-high resistance goaf model (model Ⅳ: high resistance in the upper part and low resistance in the lower part) were established. It is found that the high density resistivity method is less sensitive to modelⅠwith the increase of h, which can not distinguish the location of the abnormal body;for modelⅡ, when the interval of double-layer high-resistivity anomalous body is less than 30 m, it can not distinguish the position of the double-layer anomalous body. And when the interval between layers is more than 40 m, the position and extent of the double-layer anomalous body can be distinguished effectively. For model Ⅲ, the existence of anomalous body can be shown, but the vertical position error is large; model Ⅳ can distinguish the upper resistance and the lower resistance, but not accurately determine the location of the lower resistance of the body.
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