单一巷道进路式回采上覆充填体力学行为及稳定性研究

在分析下向进路分层无分段充填法的基础上，对某矿采用单一巷道进路式回采建立了上覆充填体力学模型，为避免人工假顶出现“悬臂梁”状态，最终确定“嵌固梁”模型作为该充填采矿法上覆充填体力学模型。依据弹塑性力学知识计算出充填体承载层厚度为0.92 m，得到了充填体最大挠度值为23.4 cm。结合工程实际，采用FLAC3D数值模拟软件研究了不同采深下采场围岩与充填体塑性区及应力分布规律，研究结果表明：除首采层以外，其余分层上覆承载层均没有发生塑性破坏，且各分层充填体所受最大主应力均没有达到其抗压强度，所选承载层厚度及充填料浆配比所得参数能够保证充填体稳定性。研究成果可为破碎围岩薄矿体实现安全高效开采提供理论依据。

Study on Mechanical Behavior and Stability of Overlying Filling Body in Single Roadway Drift Stoping Method

On the basis of the analysis on the downward drift slicing without sublevel backfilling method，a overlying filling mechanical model which applied the single route type of roadway was established.In order to avoid the “cantilever beam” of artificial roof，the “fixed-end beam” model was ultimately determined as the mechanical model of upper overlying filling body.Based on the elastic-plastic mechanics knowledge，we calculated the filling body bearing layer thickness at 0.92 m，and the maximum deflection value 23.4cm.Combined with the engineering practice，the surrounding rock and plastic zone and their stress distribution under different mining depth were studied by using the FLAC3D numerical simulation software.The results showed that except for the first layer，other bearing layers experienced no plastic failure.Meanwhile，the maximum principal stress of each layer on filling bodies were less than their compressive strength，so the selected bearing layer thickness and matching parameters of the filling pulp could guarantee the stability of filling body.The research results provide a theoretical basis to achieve a safe and efficient mining for thin ore body with crushed surrounding rock.