深基坑边坡插筋加固与开孔卸载联合支护机理及有限元分析

FEM Analysis and Retaning Mechanism Analysis of Combinng Steel Bar Reinforcement and Drilled Hole Decompression for Deep Excavation

对深基边坡稳定问题本文提出插筋加固和局部开孔卸载联合支护新体系 ,并首次提出用变弹法解出插筋作用形成复合土体的应力本构关系 ,并对其作用机理探讨。提出插筋复合土体边坡二种破坏模式和杆筋与杆间土间的四种破坏模式。最后通过对插筋与杆间土引入一个能反映粘结一滑移机制的粘结单元。建立了新的杆体与杆间土协同作用有限元模型并通过算例与实测资料对比 。

In this paper,a combining retaining system with steel bar reinforcement and drilled hole decompression is used for deep excaration stability.A varying elastic modulus model is adopted to discuss composite soil constitutive relation of the combining retaining system and its mechanism is interpreted.Two failure models of composite soil stability with sttel bar reinforcement and four failure models of steel bars and the soils are shown in the paper.A bonding element is used to explain the bond and viscous flow of steel bars and the soils.FEM is used to analyze the cases.The results of FEM and practical measurements of cases examine the constitutive model.