Abstract: The hydraulic fracturing in-situ geo-stress measurement is to obtain the characteristic value of geo-stress and time curve through the rock mass deformation caused by the induced hydraulic pressure. This method has the advantages of simple test process and large testing depth and has been widely used domestically and oversea. In this project, throughout the application of the single borehole hydraulic fracturing to measure the in-situ geo-stress in the tunnel engineering of the important node of the weather natural pipeline, the mechanical parameters such as the magnitude of the in-situ geo-stress and the direction of the principal stress in the tunnel site are obtained, and the rockburst and deformation of the surrounding rock mass are predicted, which provides an important basis for the design of the safe construction scheme of the tunnel. According to the lithology of the tunnel, it is mainly moderately weathered bedrock, which belongs to hard rock. At the present survey stage, it is predicted that there will be no large deformation of the surrounding rock during the construction period. For the local possible weak rock stratum or interlayer, rock fracture zone, etc., the rock is weak, and there may be a small amount of plastic deformation of soft rock.

Key words: Tunnel, In-Situ Geo-Stress, Hydraulic Fracturing Method, Rockburst Prediction