EXPERIMENTAL STUDY ON CALCULATION OF THE TENSILE STRENGTH OF COAL BASED ON THE POINT LOAD TEST

The point load test was used for the tensile strength measurement of coal samples. Integrity coefficient of the coal was calculated based on the wave velocity tests of coal seam in situ and coal samples. Finally, the tensile strength of coal seam was calculated by the transformation relationship between point load strength and tensile strength according to the quasi coal strength theory. The results show the integrity coefficient of coal is 0.47 and the tensile strength is 0.08MPa. The research results can provide scientific basis for underground engineering application of coal tensile strength index.