钢支撑预加力对非对称深基坑变形及内力的影响分析

The Influence Analysis of Steel Bracing on the Deformation and Stress of Asymmetric Deep Foundation Pit Supporting Structure

钢支撑是深基坑支护变形控制中的重要支护手段,非对称深基坑因开挖深度不同而具有较大的变形及内力差异。文中针对某一采用钢支撑支护的非对称深基坑工程,基于有限元HS-small本构模型对非对称基坑进行数值模拟,并对不同预加力作用下支护结构的变形及受力特性进行分析。结果表明,深度-水平位移曲线的数值模拟结果与实测值较为一致,施加钢支撑预加力能够有效地控制基坑支护结构水平变形及内力,为同类型的基坑支护设计提供参考。

Steel support is an important support method in deformation control of deep foundation pit support.Asymmetric deep excavation has significant deformation and stress differences due to different excavation depths.Based on the finite element HS-small constitutive model,the numerical simulation is conducted on a asymmetric deep excavation project using steel support,and the deformation and stress characteristics of the support structure under Prestress applied forces are analyzed.The analysis results show that the numerical simulationr esults of the depth horizontal displacement curve are consistent with the measured values.The application of steel support preload can effectively control the horizontal deformation and stress of the foundation pit support structure,and provide reference for the design of foundation pit support of the same type.