THE MEASUREMENT AND STUDY ON IN SITU STRESS IN THE CENTRAL AREA OF THE HUANGCOU ACCUMULATION POWER STATION, HEILONGJIANG

Based on the results from in situ stress measurement in Huanggou Accumulation Power Station,Heilongjiang, the authors analyse the characteristics of the in situstress. The calculation of measurements from four sites in underground plant by method of least squares shows that the maximum principal stress is nearly horizontal with N78°W trending of 9.6MPa. The result is consistent with the present tegional stress field manifested by investigation of neotectonics, and also with the regional stress field in northeastern China.