隧道外水压力是进行隧道衬砌设计的重要因素。
The external water pressure of tunnel is an important factor for tunnel lining design.
检查其原因有：设计方面，如外水压力考虑欠妥；
The main reasons are as follows. In the aspect of design, the external water pressure is not properly considered.
根据渗流计算的原理分析了“灌浆封堵”外水压力的作用机理。
According to the permeating theory of the underground water, the principle of preventing the subsurface water draining is put forward for tunnel analyzed.
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.
本文对隧道设计中常用的外水压力计算方法进行了探讨，并给出了算例。
The paper discusses the calculation method of normal external water pressure in tunnel design, gives the example.
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.
注浆圈的作用不是分担衬砌外水压力，而是通过封堵地下水降低隧道涌水量，从而以较小的排水量可显著降低甚至消除衬砌的外水压力。
The effects of grouting circle will not share the external water pressure with tunnel lining, but block groundwater and reduce the external water pressure on lining remarkably with low discharge.
注浆圈的作用不是分担衬砌外水压力，而是通过封堵地下水降低隧道涌水量，从而以较小的排水量可显著降低甚至消除衬砌的外水压力。
The effects of grouting circle will not share the external water pressure with tunnel lining, but block groundwater and reduce the external water pressure on lining remarkably with low discharge.
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