Study on Coal Body Stress Distribution Based on Kriging Interpolation Method

In order to solve small number of the measuring points applied when the seam stress field was analyzed with the stress monitoring and measuring syste m, the low accuracy of the interpolation and other problems, the Kriging interpolation method was applied to the fitting and cross validation of the variation function mod el on the stress monitored and measured data of the trial coal mining face and study the interpolation effect of different variation function model under the small measuri ng point number.The results showed that the accuracy of the Kriging interpolation method with the spherical model in the seam stress field was higher than other interp olation methods, the optimized mean value of the interpolation residual would be less than 0.2 MPa and the measuring point interval of the seam stress monitoring and measuring system in the air returning gateway and the transportation gateway of the coal mining face was less than 7.95 and 9.92 m individually as obtained.The stress nephogram obtained with the Kriging interpolation method could reflect the distribution law of the seam stress filed in the sidewalls of the trial coal miming face gateway and could provide the theoretical references to the advance support of the gateway, the stability control of the roof, the stability analysis on the surrounding rock, preve ntion of the mine pressure bumping and others.