这一方法是利用最小位能原理来计算位于弹性介质中的圆形隧道衬砌。让我们分析图1所示的在已知外力作用下的圆形衬砌。当衬砌向外位移时,就产生弹性抗力,好象无限多个支承那样独立工作,其大小与位移(压缩)成正比。衬砌上任一点的位移可分解为两个分量:径向位移,用u表示;切向位移,用t表示。 This method uses the principle of minimum potential energy to calculate a circular tunnel lining located in an elastic medium. Let us analyze the circular lining shown in Fig. 1 under the action of a known external force. When the lining is displaced outwards, elastic resistance arises, acting as if it were an infinite number of supports, and its size is proportional to displacement (compression). The displacement at any point on the lining can be decomposed into two components: radial displacement, denoted by u; tangential displacement, denoted by t.