单进路采场充填假顶力学行为数值分析  

Numerical Analysis of Mechanical Behavior of Backfill Roof in Single Drift Stope

作　　者：李明骏[1] 曹易恒 莫静 方利杰 谭崇明 周颜 LI Mingjun;CAO Yiheng;MO Jing;FANG Lijie;TAN Chongming;ZHOU Yan(Wushan Copper Mine,Jiangxi Copper Corporation Ltd,Ruichang 332204,China)

机构地区：[1]江西铜业股份有限公司武山铜矿,江西瑞昌332204

出　　处：《铜业工程》2023年第1期113-120,共8页Copper Engineering

摘　　要：为分析研究单进路采场充填假顶在暴露过程中的力学行为与发展特征,以及内部配筋的受力状态,以某矿山急倾斜薄矿体下向分层进路充填采矿法形成的充填假顶为工程实例,结合实际建立标准化三维模型,采用有限差分法分析软件进行数值模拟计算。结果表明:回采水平越深采场主应力越大,其中充填通风小井靠近上盘的井壁处受拉应力较为明显,在矿房边界外5~10 m范围内存在一定的压应力集中现象;顶板最大位移并不位于几何中心,越靠近上下盘边界位移变形量越大;吊筋所在位置顶板暴露前后受力状态由受压转变为受拉,底筋受力状态并不单一受拉,呈拉压交错复杂状态。In order to analyze the mechanical behavior and development characteristics and the stress state of the internal reinforcement of the single drift stope backfill roof in the exposure process, taking the backfill roof formed by the downward slicing drift filling mining method in a mine steeply inclined thin ore body as example, a standardized three-dimensional model is established in combination with the actual situation, and the finite difference method software is used for numerical simulation calculation. The results show that the deeper the stope level is, the greater the principal stress of the stope is. The tension of the wall near the hanging wall of the filling ventilation shaft is obvious, and there is a certain concentration of compressive stress within the range of 5~10 m outside the mine room boundary;the maximum displacement of the roof is not located at the geometric center, and the closer to the boundary of the upper and lower walls, the greater the displacement and deformation;the stress state of the ceiling where the suspenders are located is changed from compression to tension before and after the roof is exposed, and the stress state of the bottom reinforcement is not single tension, which is a complex state of staggered tension and compression.

关 键 词：单进路 充填假顶 应力 位移 配筋受力 

分 类 号：TD853[矿业工程—金属矿开采]