Exploration of parallel electrical technology for the dynamic variation of caving zone strata in coal face
Abstract：The observation system of electrical method was laid in the gas drainage tunnel above the coal face,with all the electrodes set in the tunnel floor.The electrical data were collected by the parallel electrical instrument,and the resistivity inversion of high-resolution ground electric resistance method was adopted to acquire the measured images.Based on the relationship between the electrical character variation and coal face caving locations,the dynamic variation features of caving zone strata were analyzed as follows：accompanying to coal face mining,there exists mining-induced stress in some locations of overburden strata,which lead to periodic electric character variation related to cycle weighting;during cycle weighting,the main form of overburden failures is large block of fracturing and collapsing,and the electric character features change greatly;during the interval of cycle weighting,the main form of overburden failures is small block of fracturing and falling,and the electric character features vary gradully;the results also yield the advanced range of mining-induced stress,the cycle weighting interval and the height of caving zone for the surveyed coal face.
Keywords：parallel electrical methodcoal facecaving zoneresistivityoverburden failure
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 571-577 )