摘要
为提高充填采矿法对地表沉降量的控制效果,首先采用理论分析的方法,得出提高充填体接顶率是控制地表沉降量的关键因素;然后针对目前充填体接顶率偏低的现状,提出以过烧氧化钙代替传统胶凝材料与尾砂混合进行膨胀充填的改进方法,并设计实验得到了膨胀充填体的膨胀性能。实验结果表明,膨胀充填体可提高充填体接顶率,其膨胀力可对顶板产生一定的支撑力,当灰砂比分别为1∶1、1∶3、1∶5时,对应的膨胀力大小分别为1.14、0.68、0.47 MPa。在实验的基础上,以程潮铁矿西区-175 m采场为基础,通过数值计算的方法,研究了膨胀充填体在控制地表沉降量中的作用。数值计算结果与理论分析具有很好的一致性,计算结果表明采用膨胀充填体充填可使地表最大沉降量减小94%。
In order to improve the effect of filling method on controlling ground settlement,the theoretical analysis method was adopted to conclude that improving the backfill roof contact rate is the key factor for controlling the ground settlement. Then, in view of the present low roof contact rate, an improved expanding backfill method of replacing traditional cementations and tailings mixture with burnt lime was proposed and the expansion properties of expanding backfill was gained by the experi- ment. The experiment result showed that the expandable backfill can improve the roof contact rate of filling body and its expan- sion force can generate some support force on the roof rock. The expansion forces are 1.14 MPa,0.68 MPa and 0.47 MPa when the cement-sand ratios are 1 ： 1,1 ： 3 and 1 ： 5 respectively. Finally, based on the experiments, and taking - 175 m stope of western district in Chengchao Iron Mine for instance, the effect of expanding backfills on controlling ground settlement was studied through numerical calculation. The calculation results and theoretical analysis are in good agreement. The calculation result shows that expanding backfill can lower the ground settlement by 94% in maximum.
出处
《金属矿山》
CAS
北大核心
2014年第11期127-131,共5页
Metal Mine
基金
中央高校基本科研业务费专项(编号:2013-ZY-073)
"十二五"国家科技支撑计划重点项目(编号:2011BAB05B03)
国家自然科学基金项目(编号:51104112)
