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在高阶段嗣后胶结充填法中,分析了一步采中胶结充填体的承载机理,其承受的荷载为顶板围岩塑性区内岩体的重力。通过分析充填体与侧压力的关系,推导了胶结充填体强度极限侧压状态下的力学模型。综合理论方法、ANSYS数值模拟以及国内外类似矿山充填现状对李楼铁矿高大采场矿房充填体内的应力情况进行了计算分析。根据胶结充填体受力集中的位置,充填配比采用混合比,其顶部20 m和底部20 m采用配比为1∶4,中间部位采用配比为1∶6。在工程应用中,对6个100 m充填采场的胶结充填体取芯强度进行分析,在满足采场不同段高强度的基础上,20~50 m部位充填配比采用1∶8进行充填,进而降低充填成本。
In the high-stage post-cemented filling method, the bearing mechanism of one-step cemented backfill was analyzed. The load was the gravity of the rock mass in the plastic zone of the roof surrounding rock. By analyzing the relationship between the filling body and the lateral pressure, the mechanical model under the lateral pressure of the cemented filling body was deduced. The theory and method of ANSYS, the numerical simulation of ANSYS and the filling status of similar mines at home and abroad have been carried out to calculate and analyze the stress in the filling room of the high stope in Lilou iron mine. According to the location where the cemented filling body is concentrated, the filling proportion is mixed ratio, the top 20 m and the bottom 20 m adopt the ratio of 1: 4, and the middle part adopts the ratio of 1: 6. In engineering application, the coring strength of cemented filling body of six 100 m filling stopes was analyzed. Based on the high strength of different sections of stope, filling ratio of 20 ~ 50 m was filled by 1: 8, Thus reducing the filling costs.