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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 bridges and other buildings, taking the first mining face of Sandaogou coal mine as an experimental platform, the prospecting analysis of mining subsidence of surface bridge buildings under the condition of large mining height and thin bedrock coal seam is carried out by using FLAC3D. The extent and scope of the influence of the subsidence are determined experimentally. The results show that “tilt ” caused by local subsidence of the earth’s surface is one of the key factors that cause the damage of bridge buildings. The damage of bridge structures shows the characteristics of damage, complete destruction and destruction tend to be stable. By choosing suitable Boundary constraints and geophysical parameters, more accurately simulate the basic law of the collapse of the bridge.