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文章在推导巷道的掘进费和通风动力费计算式基础上， 应用极值原理得出掘进巷道的优化断面计算式， 并结合堅城矿的掘进巷道进行实例分析。
Based on the derivation of roadway tunneling fee and ventilation fee, the article calculates the optimal section formula of roadway by using extremum principle, and combines with the roadway of Jiancheng Mine for example analysis.