摘要
采用有限元软件ANSYS对盾构隧道动态开挖过程进行数值模拟,将硐周节点应力逐级释放来模拟开挖施工过程,在模拟过程中考虑了土体的分层特性、土体材料的本构非线性以及注浆施工对土体变形的影响。并采用明德林解考虑了盾壳和土体之间纵向摩擦力对土体变形的影响。分析中提出了考虑衬砌与土体共同作用的硐周结点荷载释放系数法。通过对工程实例分析验证了该方法的可行性。
In this dissertation two- dimensional finite element method is applied to imitating the process of shield tunnel construction. The layered characteristic, material nonlinearity and plastic deformation of soil are all considered. The idiographic means is that the force of nodes on the wall of tunnel is released gradually and the influence of filling out grout is considered. The method of fixing on the factor of load releasing before lining beginning to produce effect is original. Differing from previous two - dimensional FEM, the author use MATLAB program to calculate the additional deformation produced by friction between shield and soil according to Mindlin＇s elastic solution. At last the feasibility of this method is verified by analyzing an engineering case.
出处
《低温建筑技术》
2009年第2期93-95,共3页
Low Temperature Architecture Technology
关键词
盾构法隧道
荷载释放系数
shield tunnelling
coefficient of load releasing
mindlin＇s elastic solution
