预应力锚杆巷道支护方案优化研究
Optimisation Study of Prestressed Anchor Roadway Support Scheme
郭振勇1
作者信息
- 1. 山西焦煤山煤国际豹子沟煤业有限公司,山西 临汾 041000
- 折叠
摘要
为提升支护效果,优化支护方案,对不同支护参数下支护效果进行分析,发现随着预紧力的增大,此时压应力区域叠加长度呈现逐步增大的趋势,即当锚杆预紧力增大,锚杆间应力叠加效果越强.同时随着锚杆间距的增大,此时压应力区域叠加长度及压应力均值均呈现减小的趋势,即当锚杆间距增大,锚杆间应力叠加效果越差.根据模拟结果给出优化方案,对优化后的支护方案进行应用研究,发现优化后相对于原支护设计巷道表面位移减小了 3％左右,顶板浅部离层量降低了 2％左右,深部离层无明显改变,为矿井降本增效作出一定的贡献.
Abstract
In order to improve the support effect and optimise the support scheme,this paper analyses the support effect under different support parameters,and finds that firstly,with the increase of preload,the superimposed length of the compressive stress area shows a gradual increase,that is to say,when the anchor preload increases,the stronger the effect of superimposing the stress between the anchors.At the same time,with the increase of anchor spacing,the superposition length of compressive stress area and the average value of compressive stress show a decreasing trend,i.e.,when the anchor spacing increases,the worse the effect of stress superposition between anchors.According to the simulation results,the optimisation scheme is given,and the application study of the optimised support scheme is carried out,and it is found that the surface displacement of the roadway is reduced by about 3％after optimisation compared with the original support design,the amount of shallow roof slab delamination is reduced by about 2％,and there is no obvious change in deep delamination,which makes a certain contribution to the reduction of cost and increase of efficiency of the mine.
关键词
数值模拟/顶板离层/支护优化/应力叠加Key words
numerical simulation/roof delamination/support optimisation/stress superposition引用本文复制引用
出版年
2024
NETL
NSTL
万方数据