建筑基坑变形及支撑结构设计研究

Study on the deformation of building foundation pit and support structure design

根据现场实测资料分析围护结构变形规律,运用有限元分析软件PLAXIS进行了数值模拟计算,并将计算结果与实际监测值相比较,分析结果表明:建立的有限元模型地下连续墙弯矩计算结果符合实际情况;计算得到的深层水平位移曲线呈现为"两头小,中间大"的抛物线形位移,而且最大侧移位于开挖面附近且随开挖深度不断下移;横向支撑可以有效减小地下连续墙的弯矩,采用混凝土支撑效果更加明显;但是地下连续墙受拉区域主要受开挖深度的影响,支撑的影响不大。

The deformation rule of retaining structure was analyzed by according to the field monitoring data. Numerical simulation calculations were carried out by using finite element analysis software be- ing PLAXIS and the numerical simulation results were compared with actual monitoring date. The re- sults showed that moment of underground continuous wall obtained from finite element model met with actual situation. The deep horizontal displacement curve appeared as parabola being middle part and small at two ends. The maximum displacement located nearby excavation face and the increased with the increase of excavation depth. The transverse brace could effectively decrease the moment of under- ground continuous wall. The effect of concrete support was more obvious. The tensile region of under- ground continuous wall was affected mainly by excavation depth and less support structure.