论述了国内外计算隧道衬砌外水压力的折减系数法和渗流场计算方法。
The paper discusses the methods of the coefficient reduction in determining tunnel lining's external water pressure in the world.
提出了隧道排水率的概念，分析了隧道排水率与衬砌外水压力之间的关系。
The concept of tunnel discharge ratio is put forward; and the relation between tunnel and external water pressure on lining is analyzed.
文章认为，设置排水设施和地层防渗加固是减小衬砌外水压力及维持地下水系平衡的有效措施。
The paper considers that the drainage works and the impervious element are the effective measures for reducing external water pressure on the lining and maintaining groundwater balance.
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