无煤柱开采巷道围岩稳定性分析

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。综合以上分析，确定了赵官煤矿1705工作面沿空留巷巷道围岩控制方案。

Analysis on stability of entry surrounding rock of no-pillar mining

Considering 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 was simplified as elastic mechanical model composed of gange in mined-out area,roadside packing and the roadside coal,and the anti-force on the main roof was calculated under the conditions.By the use of controlling variables,the main factors of the anti-force on the main roof was analyzed,which were backfill body width and backfill body elastic modulus,and the backfill body compression formula was obtained.On this basis,using the method of UDEC numerical simulation,the stress state of key roof rock of the gob-side entry was simulated,and the relationship of backfill body width and backfill body elastic modulus with roof convergence were obtained.On the basis of the above analysis,the method of gob-side entry rock controlling was determined in mining face 1705 of Zhaoguan Mine.