摘要
为研究软土蠕变对隧道的长期影响 ,研制了相应三维有限元软件。软件中采用适用于上海饱和软土的非线性粘弹塑性模型 ;壳单元模拟衬砌 ;罚单元协调位移。应用该软件计算分析了软土蠕变对隧道的影响 ,得出了有益的结论。
A program about 3D FEM is developed in order to investigate the long?term effect of soft?soil creep on the tunnel. The nonlinear viscoelastic?plastic model is employed in the program. It is suited for the saturated soft?soil in Shanghai. A shell element is used to simulate the lining of a tunnel. At same time, a penalty element is adopted to guarantee the comparability of displacement at the adjoin nodes. Some useful conclusions are obtained by using the developed software. One of that is the stress of the tunnel is increased with a wide margin due to the effect of soft?soil creep. The stress state of the lining is approached to the hydrostatic pressure state.
出处
《土木工程学报》
EI
CSCD
北大核心
2001年第5期85-89,共5页
China Civil Engineering Journal
关键词
非线性
弹粘塑性
三维有限元
壳单元
罚单元
nonlinear
elastic-visco-plastic
3D-FEM
shell element
penalty element
