淮南煤矿“三下”（建筑物下、水体下、铁路下）压煤量占矿区总可采储量的７０％以上，“三下”采出量占全局总产量的６０％以上。本文根据矿区多年“三下”采煤的理论研究和开采试验，对矿区开采沉陷的预计，划分了不同地质采矿条件区域和相应的数学计算模型；介绍了矿区四个井筒和工业场地煤柱开采的实例以及所采取的技术对策；介绍了在淮河及其堤坝下采煤的防水安全煤柱的留设方法和开采裂缝的性质及其发育深度的数学计算公式，及在国家铁路支线下采煤的开采损害以及消除线路开采损害的技术对策。 Huainan Coal Mine “three times” (under buildings, under water, under the railway) coal mining accounts for more than 70% of the total recoverable reserves, “three times” total output of more than 60% of the total output. According to the theoretical research and mining test of the “three times” coal mining in the mining area for many years, this paper divides the different geologic mining conditions area and the corresponding mathematical calculation model into the prediction of mining subsidence; introduces the coal pillar mining of four wellbores and industrial sites in the mining area And the technical countermeasures taken. The method of setting aside and the mathematic calculation formula of the nature and depth of the development of the water-stricken pillars coal mining under the Huaihe River and its embankment are introduced, and the coal mining under the national railway branch Mining damage and technical measures to eliminate damage to the line mining.