基于泡沫混凝土和U型钢的煤矿巷道支护体系研究
Coal Mine Roadway Support System Based on Foam Concrete and U-beam Steel
崔良杰1
作者信息
- 1. 山西煤炭运销集团三聚盛煤业有限公司,山西太原 030300
- 折叠
摘要
针对煤矿软岩大变形巷道,提出了由钢网、锚杆、锚索、喷射混凝土、可压缩U型钢、泡沫混凝土阻尼层、裂隙岩缓冲层组成的组合支护体系.运用了数值分析和现场监测的技术手段.数值分析结果表明,泡沫混凝土能吸收围岩的大部分变形,U型钢的收缩率显著降低,U型钢的平均轴力与泡沫混凝土厚度呈二阶方程关系.在工程实践中,当泡沫混凝土厚度超过30 cm时,阻尼效应不再明显.现场监测结果表明,围岩位移及U型钢受力在组合支护体系初始阶段20d内均呈增大趋势,但增大趋势减弱.
Abstract
A combined support system consisting of steel mesh,anchor rods,anchor ropes,sprayed concrete,compressible U-beam,foam concrete damping layer,and fissure rock buffer layer was proposed for the large deformation roadway of soft rock in coal mines.The technical means of numerical analysis and on-site monitoring were used.The numerical analysis results show that the foam concrete absorbs most of the deformation of the surrounding rock,the shrinkage rate of the U-beam is significantly reduced,and the average axial force of the U-beam is in the relationship of second-order equation with the thickness of the foam concrete.In engineering practice,when the thickness of foam concrete exceeds 30 cm,the damping effect is no longer obvious.And the on-site monitoring results show that in the first 20 d after the formation of the support system,the displacement of the surrounding rock and the force borne by the U-beam show an increasing trend,but the increasing trend is reduced.
关键词
围岩/组合支护体系/U型钢/泡沫混凝土Key words
surrounding rock/combined support system/U-beam/foam concrete引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据