深部巷道钢管混凝土支架与锚杆-索耦合支护技术的理论分析与数值模拟研究
Theoretical analysis and numerical simulation on the coupled support technology of concrete-filled steel tube and bolt-cable in deep roadway
左建平 1刘海雁 2刘德军 2朱凡 2赵卫平 2张琪 2李结华2
作者信息
- 1. School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;State Key Laboratory of Coal Resources and Safe Mining(China University of Mining and Technology(Beijing)),Beijing 100083,China
- 2. School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China
- 折叠
摘要
在深部巷道中使用的钢管混凝土支架与锚杆-索的耦合支护技术经常失效,导致巷道失稳.其中,增加锚杆-索的长度是一种现场常用的返修方式,但比较浪费支护材料.本文提出通过改变锚杆-索的预紧力来改善钢管混凝土支架的受力状态.首先,总结了钢管混凝土支架常见的破坏模式,并利用弹性中心法获得了钢管混凝土支架与锚索耦合支护情况下的钢管混凝土支架的内力;结果表明,施加锚索可以减小钢管混凝土支架的内力,保证其高承载力.然后,建立了钢管混凝土支架与锚杆-索在不同侧压力系数和不同耦合支护条件下的数值计算模型;进一步研究了不同侧压、不同支护方案以及在不同角度范围内增加锚杆-索预紧力下巷道围岩与支护体的应力和位移演化规律.结果表明,当锚杆和锚索预紧力分别为60和100 kN时,钢管混凝土支架与锚杆-索的耦合支护效果可以达到最佳,且最佳锚杆-索预紧力增加角度范围为15°～45°.最终将钢管混凝土支架与锚杆-索的耦合支护技术进行了现场应用,有效控制了深部巷道大变形,对深部巷道的支护方案设计具有一定的指导意义.
Abstract
Coupled support technology for concrete-filled steel tube support (CFSTS) and bolt-cable (BC) used in deep roadways often fails, and increasing the length of BC is a waste of material. Therefore, changing the pre-tightening force of BC to improve the force state in CFSTS is proposed in this paper. Firstly, the damage modes of CFSTS were investigated, and the internal forces in CFSTS contained cable were obtained using the elastic centre method. And the results indicated the cable could reduce the internal force in CFSTS to ensure its high bearing capacity. And then, the numerical calculation models with different lateral pressure coefficients and coupled support conditions were established. Further, the stress and displacement law for the roadway and the support body under different lateral pressures and different support schemes, and increasing the pre-tightening force for bolt-cable in different angle ranges was investigated. And the results show that the best "CFSTS + BC" coupled support effect could be achieved with pre-tightening forces for bolts and cables of 60 and 100 kN, respectively, and the optimal reinforcement angle range is 15°−45°. Finally, "CFSTS + BC" coupled support technology was applied in the field.
关键词
钢管混凝土支架/锚杆-索/耦合支护/内力/预紧力/角度范围Key words
concrete-filled steel tube support/bolt-cable/coupled support/internal force/pre-tightening force/angle ranges引用本文复制引用
基金项目
Beijing Outstanding Young Scientist Program,China(BJJWZYJH01201911413037)
National Natural Science Foundation of China(52225404)
National Natural Science Foundation of China(51878658)
Fundamental Research Funds for the Central Universities,China(2022JCCXLJ05)
Fundamental Research Funds for the Central Universities,China(2022YJSLJ02)
出版年
2023
NETL
NSTL
维普
万方数据