摘要
对正常工作状态下的非超长土钉支护,尤其是当基坑周围存在已有建筑物时,尝试用一种新的土钉与周围上体的相互作用有限元方法来解决,模型中的土体单元和土钉单元由于节点自由度的不同,采用自由度的相互约束并借助于大型有限元程序Ansys的约束方程来进行数值模拟,使土体的线自由度和土钉的转动自由度协调起来,解决了不同单元自由度的连接问题,得出不同位置处土钉的内力分布及开挖面的位移。与已公认的土钉支护有关结论比较,结果吻合较好。
A new interacting finite element method is tentatively
used for non-overlong soil-nail support under normal working condition
especially when there are existing buildings around the foundation pit. In
the model, mutual constraint of freedom is assumed for soil element and
soil-nail element due to the difference of node freedom. And constraint
equation of large finite element software 'Ansys' is employed for the
numerical simulation, so as to coordinate the linear freedom of the soil
with the rotating freedom of the soil-nail. Problem of joints between
different element freedom is thus resolved, and stress distribution of
soil-nail at different location and displacement of excavation cross
section are obtained, The result is better coincided with practice than
the generally accepted conclusion with regard to soil-nail support.
出处
《建筑技术》
北大核心
2004年第5期344-345,共2页
Architecture Technology
关键词
基坑
土钉支护
有限元
应力
foundation pit
soil-nail support
finite element
stress
