金川二矿区1^(#)矿体上盘贫矿开采对14行回风井的稳定性影响研究

Study on the Stability of 14 Row Return Air Shaft in NO.1 Ore Body Hanging Wall Lean Ore of Jinchuan NO.2 Mining Area

为探究矿体开采过程对竖井井筒稳定性的影响,选取金川二矿区1#矿体上盘贫矿为研究对象,在分析影响井筒围岩稳定性的主要影响因素和变形破坏机理的基础上,建立金川二矿区1#矿体有限元数值模型,采用数值模拟方法对1#矿体上盘贫矿的实际采充过程进行计算,得到了上盘贫矿开采过程中14行回风井井筒在水平、竖直方向位移和应力分布的情况,根据数值模拟结果推测出井筒最容易发生变形破坏的关键位置,并通过与现场地表监测数据对比分析,验证了数值模拟计算结果的可靠性。此研究可为地下矿山在开采扰动范围内竖井井筒稳定性的判定及返修支护提供有益探索。

In order to explore the influence of ore body mining process on shaft stability.The hanging wall lean ore of No.1 ore body in Jinchuan No.2 Mining Area is selected as the research object.Based on the analysis of the main factors affecting the stability of the surrounding rock and the deformation and failure mechanism of the surrounding rock of the shaft,the finite element numerical model of No.1 orebody in Jinchuan No.2 Mining Area is established.The actual mining and filling process of lean ore in the hanging wall of No.1 ore body is calculated by numerical simulation method.The horizontal and vertical displacement and stress distribution of 14 rows of air shaft in the process of mining Shangpan lean mine are obtained.According to the results of numerical simulation,the key position of wellbore deformation and failure is inferred.The reliability of the numerical simulation results is verified by comparing with the field surface monitoring data.This study can provide useful exploration for the determination of shaft stability and repair support of underground mine in the mining disturbance range.