Soundness evaluation of lining concrete of the undersea tunnel

为了评价海底隧道衬砌混凝土的可靠性，提出了一种新的模拟海底隧道力学行为的有限元方法。数值分析结果表明，随着水压力的增大，衬砌与地面会发生分离。渗流水的减少会引起水压力的变化或塑性区的扩大，但对衬砌混凝土的稳定性影响不大。

We develop a new finite element method which can simulate the mechanical behavior of an undersea tunnel in order to evaluate the soundness of its lining concrete. Results of numerical analysis show that lining and ground can be detached by the increase of the water pressure. We also confirm that the decrease of the seepage water can lead the change of water pressure or expansion of plastic zone, but it has little bad influence on the soundness of lining concrete.