鉄路隧道設计規范第36条有这样的規定:「在浸水地层中建筑隧道衬砌,其承受荷重計算,应考虑静水压力与地层压力的共同作用,並须考虑水的浮力作用」。但是,应怎样具体确定,迄今还未有明确的指示。以往我們在学习隧規时曾提出过一些計算公式(见专业院编印之隧規部分条文学习記录)兹经一院岑玉荣同志来信指正,该公式理論上似乎欠缺。这里就我們进一步学习中之体会,谈谈对这一问题的初步认识,希望抛砖引玉,得出合理的答案。当隧道处于浸水地层中,如在地下水面以下的饱和土层,其土粒悬浮于水中,則衬砌所受之地层压力将随土的容重的減少而減 Article 36 of the Kushiro Tunnel Design Code states that “construction of tunnel linings in flooded formations, subject to load calculations, should take into account the synergy of hydrostatic pressure and formation pressure, taking into account the buoyancy of water.” However, as to how to make it concrete, so far no clear instructions have been given. In the past, when we studied the tunnel regulation, some formulas were put forward (see the article on the study of the tunnel section in the specialized institutes). It was pointed out by a letter from Comrade Cen Yu Rong in the hospital that the theory seemed to be lacking in theory. Here to understand our experience in further learning, to talk about the initial understanding of this issue, hoping to start a discussion and draw a reasonable answer. When the tunnel is in a submerged formation, such as a saturated soil layer below the groundwater surface, its soil particles are suspended in the water, the pressure of the formation to which the lining will be subjected will decrease as the bulk density of the soil decreases