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针对以往对电阻率CT图像单纯依靠直观判断的定性分析方法,提出了一种基于图像熵值的CT图像量化评价方法,从定量的角度判读图像信息的实时变化.建立了煤层底板陷落柱突水过程的简化地电模型,利用有限元方法对该地电模型的突水过程的电阻率监测进行了正演模拟,分析了电阻率CT图像熵值对突水过程的响应特征,根据图像熵值的变化信息成功捕捉到了突水前兆信息.利用图像熵值对矿井顶板突水模型试验中的动态电阻率CT图像进行评价,较突水发生时刻提前574 s捕捉到了突水前兆信息.通过综合分析数值模拟和模型试验中图像熵值响应特点,得到了“CT图像熵值的突变本质上是对导致岩层或煤层导电性根本变化的突变事件的响应”这一重要结论,发现利用CT图像熵值量化评价方法,可以在一定程度上压制初期扰动对突水前兆信息判读和捕捉的干扰,放大突变事件的影响程度,有效的提高了突水前兆信息的捕捉的成功概率和可靠性.
Aiming at the qualitative analysis method of resistivity CT images relying on intuitionistic judgment in the past, this paper proposes a quantitative evaluation method of CT images based on image entropy to interpret the real-time changes of image information quantitatively. Process of the simplified geoelectric model, the use of finite element method of the geoelectric model water inrush process resistivity monitoring forward modeling, resistivity CT image entropy value of water inrush process response characteristics, according to the image entropy value The information of the water inrush precursors was captured successfully.Using the image entropy to evaluate the dynamic resistivity CT images of mine roof water inrush model test, the water inrush precursory information was captured 574 s ahead of the water inrush time.According to the comprehensive analysis Numerical simulation and model test of the image entropy response characteristics, obtained “CT image entropy mutation is essentially a sudden change in the conductivity of the rock or coal conductive conductivity of the incident ” This important conclusion, the use of CT images Quantitative evaluation method of entropy can suppress the disturbance caused by the initial disturbance on interpretation and capture of water inrush precursor information to a certain extent and amplify the mutation event Of the degree of influence, effectively improve the probability and reliability of the capture of water inrush precursor information.