山区地下开采地表移动变形分析

Study of Surface Deformation Due to Underground Mining in Mountain Areas

地下开采引起的地表移动变形可对地表建(构)筑物产生损坏,地下开挖地表移动变形分析对地表建(构)筑物的安全评价有着重要的实际应用价值。利用概率积分法推导出山区地表移动变形的数学模型,分析山区地下开采地表移动变形特性,利用该数学模型对具体工程实例进行分析。研究结果表明:地表自然坡坡角不同时,最大水平拉伸变形不同,随着坡度的增加,最大水平拉伸变形减小;在靠近山脚处水平变形较大,水平移动系数对地表的水平变形影响显著。该数学模型可很好地分析山区地下开采地表移动变形,为矿区地表建(构)筑物的设计和施工提供了可靠的分析方法。

The buildings and structures could be damaged by the surface movement due to under- ground mining. The analysis of geotechnical deformation due to underground mining is very useful for design and construction of the buildings. The mathematical models for analysis of surface movement due to underground mining in mountain areas are given using probability integration method. This model can be used for analysis of surface displacement and can get theoretical analysis results. The results show that the maximum horizontal tensile deformation decreases with the slope increase. Horizontal deforma- tion is larger near the foothills. The model can be a novel approach to evaluating the deformation due to underground mining in mountain areas, and can be used for design and construction of surface structures in these areas.