沿空留巷围岩结构模型的建立及其稳定性分析

综合考虑沿空留巷围岩变形、采场覆岩运动规律及巷旁支护结构的特点,将沿空留巷顶板结构简化为采空区矸石、巷旁充填体及巷帮煤体共同作用的弹性力学模型,计算了该条件下的支护反力,利用控制变量的方法分析了影响支护反力的主要因素是充填体宽度和充填体弹性模量,得出了巷旁充填体压缩量计算公式。在此基础上,通过UDEC数值模拟方法,模拟了沿空留巷顶板关键岩块在弹性支撑条件下的应力状态,分别得出了充填体宽度及弹性模量与顶板下沉量的关系。

Establishment of the Gob-side Entry Surrounding Rock Model and Analysis on Its Stability

This paper considers the characteristics of the surrounding rock deformation of gob-side entry, motion law of the overlying strata after mining and the structure of roadside support. The gob-side roof structure has been simplified as an elastic mechanical model which is composed of gangue in mined-out area, roadside packing and the roadside coal, and the reaction on the main roof has been calculated under these conditions. By the use of controlling variables, the main factors of the reaction on the main roof has been analyzed, which are backfill body width and backfill body elastic modulus, then the backfill body compression formula has been obtained. On this basis, using the method of UDEC numerical simulation, the stress state of the key roof rock of the gob-side entry has been simulated, and relationship of backfill body width and backfill body elastic modulus with roof convergence have been obtained.