MEASUREMENT OF ROCK STRESS OF HONGLING COAL MINE

To get a knowledge of in-situ stress and its distribution in the Hongling coal mine,a measurement has been done for the rock stress in coal mine area by using hollow inclusion gauge method.In this paper,the results of rock stress measurement of 3 levels are introduced,the characteristics of stress distribution are discussed.The results show that the principal stress goes in nearly NNE direction and ranges in value from 18.32 to 21.5 MPa.The horizontal stress takes the dominating place and has a bigger value than the vertical one.The middle principal stress is nearly vertical and changes in value from 13.1 to 14.79 MPa.Value of the minimal principal stress is 9.54～13.08 MPa.The value of in-situ stress increased with depth.The measurement results can be applied to mine design.