本文采用成本与效益分析的方法，从经济上对矿井合理服务年限的定量问题，作了理论上的探讨。
The optimal service life of a mine is discussed theoretically from economic point of view by analysing the cost and benefit.
乡镇煤矿资源回收率低，严重缩短了矿井的服务年限。
It has been shortening the service life of mines because of their low recovery ratio.
本文在认真分析矿井涌水规律的基础上，应用随机服务理论的观点和方法，建立了矿井排水的排队论模型和系统可靠性模型。
Based on analysis of the regularity of mine water, the concepts and methods of the stochastic serve theory being applied, the queueing and reliability models of mine drainage system are developed.
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