煤矿开采对马家石畔沟大桥影响研究

Coal mining influence on Majiashipangou Bridge

针对马家石畔沟大桥受开采影响情况,从地表移动变形及地基基础稳定性两方面进行分析。根据大桥移动变形的观测数据,结合大桥结构及开采区地质开采条件,分析给出了采空区地表移动变形规律。在此基础上,结合大桥受损现状分析,应用概率积分预计模拟方法,模拟预计了开采地表剩余移动变形对大桥的影响程度,确定了开采对大桥影响程度在I级范围内。针对大桥的地基稳定性,运用传统分析与FLAC3D的结合,确定了大桥下伏采空区处于基本稳定状态,研究结果可作为桥梁的后期修复的依据。

In view of the impact of mining on the Majiashipangou Bridge,the surface movement deformation and foundation stability are analyzed.According to the observation data of the bridge’s moving deformation,combined with the bridge structure and the geological mining conditions of the mining area,the law of surface movement and deformation of the goaf is analyzed.On this basis,combined with the analysis of the damage status of the bridge,the probability integral prediction simulation method is applied to simulate the expected impact of the residual movement deformation of the mining surface on the bridge,and the influence degree of the mining on the bridge is determined to be within the I-level range.Aiming at the foundation stability of the bridge,using the combination of traditional analysis and FLAC3 D,it is determined that the underlying goaf of the bridge is basically stable.