基于受力控制和位移控制有限元法的隧道开挖对土体自由位移场的影响

在总结分析前人研究成果的基础上,将弹塑性有限元引入隧道分析,通过应用自编的有限元程序,建立了统一的有限元模型,对"土体-隧道"两者间的作用特征进行了研究,重点进行了两种方法的隧道开挖对土体自由位移场影响的对比分析。计算结果表明,受力控制有限元法更符合施工过程;而位移控制有限元法则与实测值更接近。

Displacement field in clay due to tunneling with force-controlled and displacement-controlled FEM

On the basis of previous studies by other researchers,elastic-plastic finite element method is employed to investigate the complicated tunneling problem.Using self-coded program,the uniform finite element model is developed to study the characteristic of soil-tunnelling interaction.The influences of force-contolled finite element method and displacement-controlled finite element method on soil free displacement field are compared.Results show that force-controlled method is better in simulating the enginnering process, while the displacement-controlled method is simply available and the results are closer to real measurement.Both methods can be used in engineering projects.