“三下”采煤的安全问题是长期以来在采矿中值得注意的问题，它关系到矿井作业的安全和经济效益问题。
Mining under the village , the railway and the water is a problem in mining, which is related to the safety and the economic benefit in every coal pit.
覆岩破坏规律探测是“三下”采煤，尤其是水体下采煤不可缺少的部分。
It is indispensability of overburden failure law for mining under buildings, water bodies and railways, especially mining under water bodies.
条带开采作为“三下”采煤的主要技术措施之一，在我国煤矿区被广泛采用。
The strip mining as one of the main technical measures for coal mining operation under buildings, railways and water bodies has been widely applied to coal mines in China.
本文的研究成果对开滦矿区深部开采及类似矿区的地表沉陷预测及控制、“三下”采煤具有一定的理论价值和指导意义。
The results can provide theoretical basis and scientific references for Kailuan mining area and similar mining area to predicting and controlling surface subsidence and mining under the "three body".
本文的研究成果对开滦矿区深部开采及类似矿区的地表沉陷预测及控制、“三下”采煤具有一定的理论价值和指导意义。
The results can provide theoretical basis and scientific references for Kailuan mining area and similar mining area to predicting and controlling surface subsidence and mining under the "three body".
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