基于弹性地基曲梁理论的盾构隧道管片分析方法

基于弹性地基曲梁理论，考虑管片接头的抗弯、抗压和抗剪性能，采用状态空间法，求得圆形盾构隧道管片环在周围土压力作用下变形和内力的解析解. 通过与有限元和简化解结果的对比，验证了解析结果. 参数分析表明，在盾构工法的典型地层范围内，接头剪切刚度的变化对衬砌内力和变形的影响明显小于其他2个方向刚度的变化. 衬砌的水平变形由受压内缩趋势和荷载差异导致的横扩趋势共同决定. 接头轴向刚度的削弱加剧内缩趋势，土弹簧的存在对上述2种趋势的发展起限制作用. 当接头轴向刚度较小时，内缩趋势占主导地位，将导致衬砌向内的水平变形.

Structural analysis of shield tunnel lining using theory of curved beam resting on elastic foundation

The state space method was used to find the exact solution for the deformations and internal forces of a lining subjected to surrounding ground pressure based on the theory of curved beam resting on elastic foundation and considering the rotation-resisting, compression-resisting and shear-resisting capacities of joints. The solution was validated by a comparison with the results of the finite element method and simplified analytical solution. The parameter analysis showed that the variation of shearing stiffness of the joints shows a less influence on the internal forces and deformation of the lining than that of the other two stiffnesses of joints in the typical range of soil deposits for the application of shield tunneling. The horizontal deformation of lining is codetermined by the contracting trend of the entire lining due to compressional force and the horizontal expansion trend caused by the difference between vertical and horizontal pressure acting on the lining. The degradation of axial stiffness of joint may increase the contracting trend of lining, and the existence of soil springs can limit the development of both trends. When the compressional stiffness of joints is small, the contracting trend would be dominant and lead to an inward horizontal deformation.