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Abstract Through bore in the top rock and laneway，the bore-laneway observing system is formed. According to mining velocity，the changing characters of electric field in different time can be tested；and the changing law of overburden failure affected by mining can be analyzed comprehensively. The height of “two belts” gained by detection is helpful for safety production of mine. Using the practical coal seam as the geological model，the mining condition of coal seam is found through the technique of the similar simulation. The detection simulation is arranged combined with the bore-laneway resistivity system. The comprehensive analysis result can improve the accuracy for the height of the “two belts”. The research results of simulation show that the bore-laneway resistivity method has sensitive reaction to structure change affected by mining. The resistivity ratio section of several time and background detection can resolve effectively the characters of stress excess，distortion and failure of rock during the process of the model mining. According to the detecting results in model workface，the height of caving zone is 0.07 m；and the height of failure zone is 0.33 m. According to the proportional similarity of 100，the result is consistent with the practical measured values in mine workface.
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2011, Vol. 30 
