Abstract:Based on the occurrence characteristics of goaf in mines, three-dimensional laser scanning and transient electromagnetic method were respectively used to detect the visible and invisible goafs, and fine three-dimensional models of goaf groups were obtained. On this basis, a three-dimensional numerical calculation model was established to carry out numerical simulation of goaf stability. Analyzed the distribution of maximum principal stress, minimum principal stress, plastic zone, and stress intensity ratio after excavation in the goaf of Section 6, as well as the displacement variation of each monitoring point with the calculation time step. The results show that the maximum principal stress of the rock mass in Section 6 is -0.25~-3.9MPa, and the minimum principal stress is 0.29~-0.50MPa. The stress intensity ratio in the pillar between the goaf and the adit is ≥1.64. The overall stability of the adit is good, while the stability of the goaf is relatively poor. The research methods and achievements provide useful references for the detection and treatment of hidden goaf under similar conditions.
