胶东半岛某金矿矿区地应力场分布规律与地质构造关系研究

Based on geological tectonics analysis and in-situ stress measurement, the distribution law of in-situ stress field of a gold mine area in Jiaodong peninsula of China was studied. NNE-NE and NWW two group faults developed in Jiaodong peninsula, the first group belongs to Penglai-Qixia and Muping-Jimo fault systems, which are the main faulted structures in this region. Several large-scale faults are distributed in the mine area, including Linglong fault (NNE), Potouqing fault (NEE), Yuhuangding fault (NE) and Jiuqujiangjia fault (NNE). The structures in this region have undergone 3 tectonic phases: NWW-SEE compression, NNW-SSE extension and NW-SE compression. In order to accurately reflect the distribution law of in-situ stress field in the mine area, an improved overcoring technique was applied in measurement, and the values and directions of 3D geo-stresses at 18 points, which are distributed in 7 levels, were determined. Comprehensive study of distribution law of the in-situ stress field in the mine is completed. The results show that the maximum horizontal principal stresses of 15 points are oriented in SE-NW direction which is approximately coincide with the orientation of New Cathaysian tectonic stress field, and coincide with NWW-SEE tectonic stresses caused by NNE-NE ore-controlling faults, which strongly proves the correctness of the in-situ stress measurement results and has great importance to the design of the gold mine.