Stress analysis of mine wall in panel barrier pillar-stope under multi-directional loads

In order to determine the stress distribution of the mine wall under the trapezoidal lateral load and vertical load, a mechanical model of the mine wall was established and analyzed based on the elastic plane strain assumption. Using the model, the reasonable width of the mine wall was determined, the possible forms of failure were analyzed, and the controls related to the mine wall stability were proposed. The results show that the initial lateral load q affects the horizontal stress, the vertical stress and the shear stress, and the initial vertical load P0 only affects the vertical stress. The maximum and the minimum of horizontal stress do not change with the width. The shear stress is symmetrically distributed along the central axis of the mine wall and the maximum appears in the center of the mine wall. When the mine wall is small, the tensile stress appears on the side of filling body. The maximum vertical compressive stress appears at the bottom on the side of the cavity. According to the cases of Dongguashan copper mine, the width should be more than 3.5 m. The mine wall with 4 m in width is selected for on-site engineering, and the mine wall stability is in good condition. © 2018, Central South University Press. All right reserved.