摘要
针对残采区大巷过采空区时,破碎围岩变形强烈的支护难题,提出充填膏体+锚网索+工字钢棚联合支护技术,并通过理论分析、物理实验与数值模拟相结合,研究论证膏体材料合理配比及受长时蠕变影响后支护系统的稳定性。研究表明:当膏体材料水泥∶粉煤灰∶矸石为2∶5∶5时,巷道顶锚杆最大轴力为109.8kN小于其破断力153.9kN,支护系统能够有效抑制围岩流变破坏;巷旁膏体充填体经过二次蠕变,巷道位移曲线可分为:Ⅰ耦合蠕变区,Ⅱ阻尼蠕变区,Ⅲ定长蠕变区,相应的锚杆受力曲线可分为:Ⅰ耦合增阻区,Ⅱ急增阻区,Ⅲ恒阻区。
When the roadway in residual area passed through the mined-out area, the deformation of surrounding rock was too serious and difficult to support. According to this problem, the combined support technology of the filling paste, anchor net wire and the I-beam steel shed was put forward. Through theoretical analysis, physical experiments and numerical simulation, the rational proportion of paste materials and the stability of support system influenced by long-terra creep were demonstrated. The results showed that the maximum axial force of the bolt in the top of the roadway was 109.8 kN, which was less than its ultimate breaking force of 153.9 kN, when the proportion of cement, fly ash and gangue was 2 ： 5 ： 5. The supporting system could effectively restrain the flowing deformation of the surrounding rock. The paste filling body beside the roadway had a sec- ondary creep. And the roadway displacement curve could be divided into three zones, including I coupling creep zone, II damp- ing creep zone, andIII fixed length creep zone. The corresponding anchor force curve could be divided into I coupling resistance area, II acute resistance area, andIII constant resistance area.
出处
《矿业研究与开发》
CAS
北大核心
2018年第3期95-99,共5页
Mining Research and Development
关键词
残采区大巷
联合支护技术
膏体材料
蠕变
数值
模拟
Roadway in residual area, Combined support technology, Paste filling materials, Creep, Numerical simulation
