摘要
沿空留巷下位顶板的破断位置决定着上位顶板的破断位置和巷道围岩的稳定性,其破断位置一般在煤帮附近或巷旁支护体外侧,受控于巷旁支护和巷内支护强度。基于极限分析和力学平衡理论,分别对2个不同破断位置的下位顶板建立力学模型,得到巷旁支护阻力与下位顶板破断位置的关系,并且分析了顶板破断后的扰动效应。结果表明下位顶板在巷旁支护体外侧破断,有利于维护巷旁支护体和煤帮。进而,从提高顶板岩层抗弯能力、增大顶板岩层抗拉强度和改善应力环境3个方面分析了顶板进行合理锚杆支护后,可使下位顶板破断更趋向于采空区侧。
The broken location of the lower roof determines the broken location of the upper roof and the stability of the surrounding rock in gob-side entry retaining. Generally, the broken location of the lower roof appears near the coal side or outside of entry-side support, which is controlled by the strength of entry-side and entry-in support. In the paper, mechanical models of the lower roof with different broken locations were established based on the limited analysis theory and the mechanical equilibrium theory. The relationships between the entry-side supporting resistance and the broken location of the lower roof were obtained, and the disturbance effects after the broken of the lower roof were analyzed. The results show that it benefits to the maintaining of the entry-side support and coal side if the lower roof breaks outside the entry-side support. And then, the implementation of the bolting support to the roof was analyzed from increasing the resisting bending capacity and tensile strength of the roof and im- proving the stress environment, which can make the lower roof break tending to the gob.
出处
《采矿与安全工程学报》
EI
北大核心
2012年第6期802-807,共6页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51174195)
中央高校基本科研业务专项资金项目(2010QNA31)
关键词
沿空留巷
顶板
破断规律
巷旁支护
巷内支护
gob-side entry retaining
roof
breaking law
entry-side support
entry-in support
