Development and validation of a 3D numerical model for TBM-EPB mechanised excavations
Development and validation of a 3D numerical model for TBM-EPB mechanised excavations
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DOI：
10.1016/j.compgeo.2011.10.004
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发表时间：
2012-03-01
影响因子：
5.3
通讯作者：
Castellanza, R.
中科院分区：
文献类型：
--
作者：
Lambrughi, A.;Medina Rodriguez, L.;Castellanza, R.
建立了一个能够模拟TBM土压平衡掘进机（Tunnel Boring Machine-Earth Pressure Balance，简称TBM-EPB）掘进施工全过程的机械化开挖三维数值模型，对机械化开挖的主要施工环节进行了模拟。通过一系列的参数分析研究了它们对计算的地面位移的影响。为了检验所提出的三维数值模型的性能，进行了一系列的25个C级预测。1995年至2003年马德里地铁扩建工程的施工历史被认为是用于此目的。作为一般规则，修正剑桥模型得到的结果与现场测量结果非常吻合。当使用线弹性或莫尔-库仑模型时，由于在现场测量数据周围观察到更高的波动，因此不容易总结所获得的结果。在考虑水平位移沿着深度分布时，模拟结果与实测结果吻合较好，但在某些地段，模拟结果不能再现现场实测的地表沉降值。对结果的仔细观察表明，在这些情况下发现了混合面条件，TBM在分层土壤地层中开挖，具有明显不同的力学行为。(C)2011爱思唯尔有限公司保留所有权利。
A 3D numerical model for mechanised excavations is presented, which is capable of simulating the overall process of excavation and construction of a tunnel when a TBM EPB (Tunnel Boring Machine-Earth Pressure Balance) is used.The main construction aspects of a mechanised excavation are modelled. Their influence on calculated ground displacements are investigated by means of a series of parametric analyses.With the aim of testing the performance of the proposed 3D numerical model, a series of 25 Class C predictions has been carried out. Case Histories related to the construction of the 1995-2003 Madrid Metro Extension Project were considered for this purpose.As a general rule, the results obtained with the Modified Cam-Clay model closely fit in situ measurements. When the Linear-Elastic or the Mohr-Coulomb models are used, it is not as easy to summarise the results obtained, as higher fluctuations are observed around in situ measured data. A good agreement is also shown when the distribution of horizontal displacements along depth is considered.For some sections, the mechanised excavation model is not capable of reproducing the high values of the surface settlements measured in situ. A closer look at the results shows that mixed face conditions are found for these cases, with the TBM excavating through layered soil formations having sharply different mechanical behaviour. (C) 2011 Elsevier Ltd. All rights reserved.