Abstract:In this paper, three-dimensional geological modeling was carried out in the Shizhu bottom gold mine area with the help of Rhino modeling software, and feasibility study of multi-section mining scheme was carried out in the Shizhu bottom gold mine with FLAC3D. Two multi-section mining schemes were designed for excavation → filling simulation according to the production scale in the Preliminary Design of Shizhu Bottom. The settlement disturbance caused by the mining and filling process of the first and second schemes is very weak and almost unaffected. After the excavation of two middle sections at the same time, the maximum displacement in the vertical direction of the backfill roof surrounding rock is -2.85×10-2m. After the excavation of three middle sections at the same time, the maximum displacement in the vertical direction of the surrounding rock of the backfill roof is -4.35×10-2m. After excavation → filling, the stress reaches a new balance again. The maximum principal stress of the surrounding rock of the backfill roof is mainly affected by the tensile stress, and its maximum value does not exceed the tensile yield strength of the surrounding rock. The minimum principal stress is mainly compressive stress, which acts on the backfill body, resulting in shear-plastic strain zone, while the remaining parts only produce local shear-plastic strain zone.No large and penetrating plastic strain area has been formed, so under the premise of filling mining, the surrounding rock of the filling body is basically stable, and the mining schemes designed in Scheme 1 and Scheme 2 are basically feasible,However, from the perspective of displacement, scheme I is more conducive to surface stability and stope safety.
