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为优化下向进路胶结充填的技术参数,以分层进路开采顺序、充填体钢筋网度和直径、充填进路承载层厚度、回采进路断面尺寸等影响到充填体稳定性的主要工艺参数为研究对象,特别考虑钢筋单元和充填体与围岩间存在的薄弱接触单元,运用FLAC3D构建不同工况的数值模型对某矿正在使用的下向进路充填采矿法进行了模拟研究。研究结果表明,开采过程充填体与围岩接触区域薄弱面顶角局部、进路靠未采进路纵向中心部位以及进路靠未采进路侧的顶角处易产生应力集中;最大位移出现在充填体假顶的中心位置,向四周辐射减小;薄弱面的存在使得充填体中钢筋网主要承受充填体自重。
In order to optimize the technical parameters of the cementation filling of the downwards approach, the main process affecting the stability of the filling body, such as the sequence of stratified route mining, the mesh size and diameter of the reinforcing steel bar, the bearing layer thickness of the filling body and the section size of the recovery approach The parameters are the research object, especially considering the weak contact elements between the steel bar element and the filling body and the surrounding rock. The FLAC3D is used to construct the numerical model of different working conditions to simulate the downhole approach filling mining method currently used in a mine. The results show that the top corner of the weakened area in the contact area between the filling body and surrounding rock during the mining process is locally located. The longitudinal center of the approach road and the top corner of the approach road near the unscrupulous approach tend to generate stress concentration. The maximum displacement occurs At the center of the top of the filling body, the radiation to the surroundings is reduced. The presence of the weak side makes the reinforcing steel mesh in the filling body mainly bear the weight of the filling body.