摘要
针对复杂采矿条件下金川二矿区仍采用多中段开采的现实,采用三维非线性有限差分数值模拟方法,揭示了1 000 m临时水平矿柱从其形成、逐分段回采变薄直至最终消失全过程,在控制围岩地压活动方面所起作用的机制,以及临时矿柱应力与变形分布的演变规律。结论表明,临时水平矿柱形成之初,在控制上下围岩收敛变形方面起到明显的作用,但在矿柱与围岩结合部位引起应力集中现象明显;回采水平矿柱对采空区下盘围岩变形产生相对较大影响,但不至引起灾害性地压活动的产生。
For the reality of multi-level mining in Jinchuan No.2 mine under the complicated geological and mining conditions,three-dimensional finite difference code,the mechanism,on which temporary pillar support controlled redistribution of the ground pressure and convergence displacement in mined-out structure,was found,and the change in distribution of the pillar＇s stress and deformation was obtained as the horizontal pillar was thinned and disappeared due mining in sublevel downwards.The results showed that at the beginning of pillar formation,it played important role in controlling the convergence between the hanging wall and footwall surrounding rock of mined-out range,but obvious stress concentration occurred in the conjunction of the pillar and surrounding rock.After recovering the pillar,the convergence deformation of the footwall increased obviously in comparison with the hang wall＇s deformation,but it could not caused catastrophic ground pressure movement.
出处
《金属矿山》
CAS
北大核心
2010年第3期29-31,65,共4页
Metal Mine
基金
国家自然科学基金项目(编号:59804007)
关键词
金川二矿区
复杂采矿条件
多中段开采
水平矿柱
地压活动
Jinchuan No.2 mine
Complicated mining conditions
Multi-level mining
Horizontal pillar
Ground pressure activity
