大采高薄基岩煤层开采对桥梁的影响

The Impact of Coal Seam With Large Mining Height and Shallow Overburden on Bridge

为了准确预测并分析开采对桥梁等建筑物的影响,以三道沟煤矿首采工作面为实验平台,采用FLAC3D对大采高薄基岩煤层条件下的地表桥梁建筑物进行开采沉陷预计分析,通过实验确定了沉陷影响的程度及范围。结果表明地表的局部下沉引起的"倾斜"是造成桥梁建筑物破坏的关键因素之一;桥梁建筑物的破坏呈现破坏累积、完全破坏、破坏趋于稳定的特点;可以通过选取合适的边界约束条件及岩土物理参数,较为准确地模拟出桥梁沉陷破坏的基本规律。

In order to accurately predict and analyze the impact of mining on the bridge building, taking the working face in Sandaogou Coal Mine as the experimental platform, FLAC3D is used to predict and analyze mining subsidence of bridge building under the condi- tion of large mining height and shallow overburden, and the influence scope is determined. The results show that the inclination of sur- face is one of the main factors resulting in bridge building damage ; bridge building damage showed the tend of damage accumulation - completely destroyed - failure to be stable; through the selection of boundary conditions and the appropriate geotechnical parameters, the basic law of the bridge subsidence damage can be more accurately simulated.