Analytical Calculation Model of Roadway Floor Stress on Different Types of Backfills
The horizontal isolation pillar set between the caving stope and the backfill stope will cause uncoordinated deformation in the later caving and mining project.In view of the problem,taking the-170 m isolation pillar of an iron ore mine as the engineering background,based on the theory of elastic mechanics and considering the influence of the lower backfill,a solution model of floor stress for the roadway excavation on weak backfill was constructed,and the stress distribution characteristics of the roadway floor on the weak backfill were studied by analytical calculation and numerical calculation.The stress distribution law and stress increment analysis calculation model of floor after roadway excavation under three different types of backfill floor were obtained.The results show that the stress distribution of the floor can be described by the superposition of the original rock stress,the additional stress of the floor and the incremental stress of the roadway excavation.For the cemented backfill floor after roadway excavation,the excavation stress concentration area is on the cemented backfill.For the cemented and non-cemented backfill after roadway excavation,the stress on both sides of the floor is unevenly distributed,the high-stress area on the cemented side presents a large and relatively concentrated peak,and the stress on the non-cemented side presents a double-peak and double-peak valley distribution,with a small peak value and a large influence range on the non-cemented side.For the non-cemented backfill floor after roadway excavation,a large range of stress reduction areas appear,the stress transfer amount and influence range are relatively large,and the cemented backfill on both sides bear the main load.
万方数据
维普
