摘要
基于软土地层中柔性衬砌与地层间的相互作用及协调变形,提出了隧道衬砌的抗偏压刚度、隧道与地层的相对刚度比两个概念,并据此建立了考虑管片接头转动刚度变化的相对刚度比计算理论。应用该理论对处于上海软土地层中的装配式圆形隧道衬砌的柔性指标进行了定量计算。计算结果表明:当隧道衬砌厚度为200 mm时可以认为是全柔性衬砌,这一结论与根据Peck.等提出的估价衬砌与地层相对柔性的定性判断准则的结论是比较一致的。根据计算,目前上海地铁350 mm厚衬砌的柔度指标为69%,从理论上证明了称其为具有一定刚度的柔性衬砌这一说法的合理性。
Considering the interaction and coordinate deformations between flexible tunnel lining and the adjacent soft ground, the concepts of stiffness resisting differential pressure on tunnel and relative stiffness ratio of runnel and ground were presented. The corresponding theoretical method to calculate this ratio was set up considering the variation of joint rotating stiffness with the magnitude of stress. As an application of this theory, based on the constructed Shanghai Metro Line No.2, flexibility index of tunnel lining was quantitatively discussed. The result shows that the lining with thickness of 200 mm should be treated as flexible tunnel and the flexibility index is assumed to be 100%. This conclusion has a good agreement with the qualitative result from the valuating criteria of relative flexibility founded by Peck et al in 1972. For the existing Shanghai Metro tunnel lining with thickness of 350 mm, the calculated flexibility index is 69%, which theoretically demonstrates such an argument that the present Shanghai Metro lining is, to some extent, flexible with rigidity.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第13期2262-2265,共4页
Chinese Journal of Rock Mechanics and Engineering
