摘要
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 un- derhand drift cut-and-fill stopping, taking the stoping se- quence of stratified drift, the reticular density and diameter backfilling reinforcing bars, the thickness of bearing layer of backfilling and the sectional dimension of drift as research objects, the underhand drift cut-and-fill stoping applied in a mine was studied with numerical models under different con- ditions built by using FLAC3D, in which the weak interface unit between the steel unit and backfill and the wall rock was considered especially. The results showed stress concentra- tion was easy to occur at the top corner of interface betweenbackfill and wall rock, the lengthways central portion of un- mined drift and the top corner of unmined drift, the maxi- mum displacement located at the center of artificial concrete roof and decreased to periphery gradually, the existence of weak interface between backfill and weak rock made reinfor- cing bar mesh to mainly carry the weight of backfill.
出处
《矿业研究与开发》
CAS
北大核心
2013年第1期5-8,22,共5页
Mining Research and Development
关键词
下向进路胶结充填采矿法
工艺参数
充填成本
Underhand drift cut-and-filling stoping, Techno-logical parameter, Cost of backfilling
