Abstract: In-situ stress is highly important to the safe construction and long-term stability of underground engineering. Acoustic emission method, inelastic recovery method (ASR in short) and hydraulic fracturing method are applied to measure the in-situ stress in the area of 2 005 m shaft construction of Xiling of Sanshandao gold mine. The distribution law of in-situ stress and its abnormal area are obtained, and the principle and application conditions of different in-situ stress testing methods are briefly described. The results show that the horizontal maximum principal stress at different buried depths is always the major principal stress. Meanwhile, when the buried depth increases to a certain extent, the second principal stress changes from the horizontal minimum principal stress to the vertical principal stress. In addition, the results of AE measurement show that the Kaiser effect point of the third principal stress is different from those of ASR and hydraulic fracturing. Furthermore, the variation trends of ?H/?v, ?h /?v and ?H /?h with buried depth are analyzed, and the abnormal area of in-situ stress in the test area is delineated. The study could provide effective data support for the design, construction and long-term stability of the shaft.

Key words: hydraulic fracturing method, inelastic strain recovery method, acoustic emission method, in-situ stress measurement