拉锚式支护结构水平位移影响因素的有限元分析

Finite element analysis of the factors affecting the horizontal displacement of tension anchor supporting structure

用有限单元计算方法对拉锚式支护结构进行分步开挖的模拟计算,分析支护结构的刚度、锚杆预应力及土结构接触界面的强度折减系数等对支护结构位移的影响。结果表明,及时有效地安装锚杆是控制地连墙位移的有效方法;适当增大支护结构刚度和锚杆预应力能减小墙体水平位移;增大土结构间的界面强度折减系数会使墙体水平偏移量逐渐减小,且这种影响有时是决定性的。

This paper presents a finite element method to simulate the process of staged excavation, and analyzes the factors that affect the horizontal displacement of retaining wall, such as the rigidity of supporting structure, prestressed value of the bolts, and the strength reduction of the contacted ar- ea between the soil and the supporting structure. The result shows that it is effective to control the displacement of wall by constructing the bolts in time, and that the increase in the rigidity of supporting structure and the prestressed value of the bolts can lead to the decrease of the horizontal displacement of retaining wall, yet it is not recommended to increase too much. The increase in the strength reduction can make the wall＇s horizontal displacement decrease gradually, and sometimes the influence is decisive.