Antholith stress measuring method based on underground directional long borehole hydraulic fracturing method

The invention discloses a protolith stress measuring method based on an underground directional long borehole hydraulic fracturing method, which can accurately determine the direction of a hydraulic fracture generated on a hole wall by means of a high-resolution in-hole camera technology. The expansion scale and direction of the hydraulic fracture network on the inner side of the hole wall can be accurately determined by means of a high-performance aperture geological radar, and the direction of the primary rock crustal stress is comprehensively determined by fusing the two data. According to the method, a three-dimensional ground stress test is carried out at a place which is more than 100m away from an excavation area (roadway), so that the influence of excavation disturbance stress on primary rock stress can be completely avoided. 本发明公开了一种基于井下定向长钻孔水力压裂法的原岩应力测定方法，该方法借助于高分辨率的孔内摄像技术能够精准确定水力裂缝在孔壁产生的方向，还借助高性能的孔径地质雷达能够精准确定水力裂缝网在孔壁内侧扩展规模和方向，融合以上两者数据综合确定原岩地应力的方向。本发明在距离开挖区域(巷道)100m以上的地点开展三向地应力测试，能够完全避开开挖扰动应力对原岩应力的影