粘弹性饱和土中深埋圆形隧道衬砌-土相互作用

SOIL-STRUCTURE INTERACTION OF A DEEP CIRCULAR TUNNEL IN VISCOELASTIC SATURATED SOIL

  • 摘要: 基于Biot理论,采用渗流-力学耦合模型研究分析了粘弹性饱和土体中深埋圆形隧道衬砌-土相互作用问题,并考虑了衬砌材料的徐变特性.假定衬砌和土体完全接触,运用积分变换理论在Laplace变换域中得到了衬砌和土体接触面上的应力、变形及衬砌的薄膜力和弯矩.利用Laplace数值逆变换得到时域中的解,并由此分析讨论了衬砌和土体的相对刚度、阻尼比、以及衬砌的相对厚度对隧道衬砌与土体相互作用的影响.数值结果同时也反映了应力、变形、薄膜力和弯矩的随时间变化过程.

     

    Abstract: Based on Boit's theory, the soil-structure interaction of a deep circular tunnel in viscoelastic saturated soil is investigated using a coupled porous-mechanical model. The creep property of liner is considered. The soil–structure is assumed to contact continuously. Analytical solutions of stresses, displacements on the contact surface of soil-structure and, membrane forces and bending moments of the liner are derived in the Laplace transform domain. Numerical results in time domain are obtained by inverting Laplace transform and the influence of relative rigidity, ratio of damp of lining and soil, and relative thickness of lining on the soil-structure interaction is studied. It is found that stresses, displacements, membrane forces and bending moments are time-dependent.

     

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