Abstract: To achieve effective monitoring of three-dimensional stress state in surrounding rock and its change law with mining, the fiber Bragg grating (FBG) sensing has been used and the correlative simulation experiment has been carried out. The test structure sensitive to three-dimensional stress has been formed by respective pasting three fiber gratings parallel to x，y and z direction on the rubber matrix cube surface. Based on the generalized Hooke law, the mechanical relationship between the fiber’s strain and the rock’s stress has been derived, and the correlative mechanical calibration experiment has been performed. The result indicates that the sensor has a good mechanics response characteristics to three-dimensional stress, and the sensitivity coefficients of stress λ1 and λ2 are respectively 0.047 14 and 0.021 84 ε/MPa. In addition, the three-dimensional stress change in the simulation experiment during mining has been tested. The result indicates that the sensor can achieve the monitoring of three-dimensional stress in simulation models, and the result is consistent with the actual change process, and it can meet the requirement of rock three-dimensional stress detection.

Key words: surrounding rock, three-dimensional stress, FBG, simulation experiment, monitor