Twin-tunnelling-induced changes to clay stiffness
Twin-tunnelling-induced changes to clay stiffness
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DOI：
10.1680/jgeot.sip17.p.151
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发表时间：
2017-09
期刊：
影响因子：
5.8
通讯作者：
S. DiVall;R. Goodey;S. E. Stallebrass
中科院分区：
文献类型：
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作者：
S. DiVall;R. Goodey;S. E. Stallebrass
在城市环境中用于运输的隧道通常成对建造。隧道连续建造且距离很近的项目被称为“双隧道”。案例研究和最近的研究表明，这种方案的沉降预测不能确定使用现有的简单方法，从考虑一个单一的隧道。为了确定沉降变化的原因，在超固结粘土中对各种双隧道布置进行了一系列离心试验。测试包括预制的空腔，从该空腔中可以精确地排出特定量的支撑流体，从而产生预定量的隧道体积损失。获得了地表和地下位移、隧道附近孔隙水压力变化和隧道内支撑压力的数据。系统地使用空腔收缩模型被认为是解释上述现象的一种信息丰富的方法。
Tunnels used for transportation in urban environments are often constructed in pairs. Projects in which tunnels are constructed sequentially and within close proximity are referred to as ‘twin tunnelling’. Case studies and recent research indicate that the prediction of settlements for such schemes cannot be determined using existing simple methods derived from consideration of a single tunnel. To establish the reasons for the observed variation in settlements, a series of centrifuge tests was undertaken on various twin-tunnel arrangements in overconsolidated clay. The tests consisted of preformed cavities from which a specific quantity of supporting fluid could be drained, with precision, creating a predetermined magnitude of tunnelling volume loss. Data were obtained for surface and subsurface displacements, changes in pore-water pressure near the tunnels and the support pressure within the tunnels. The systematic use of cavity contraction models was found to be an informative method of explaining the o...