基坑开挖对桩锚支护结构的影响分析

Analysis of Influence of Foundation Pit Excavation on Pile-anchor Structure

结合工程实例分析了基坑分步开挖过程中桩锚支护结构的变形特征及其内力变化规律,对数值模拟结果和工程实例监测结果进行了对比分析.结果表明:基坑开挖后,主动土压力区地应力状态发生改变,支护桩产生的水平位移最大值随着开挖深度增加而下移;预应力锚索结构能有效的控制支护桩产生的水平位移;数值方法可以有效地为信息化施工提供依据,对指导基坑的安全施工有一定的作用.

The paper,based on real engineering projects, analyzes the law of deformation characteristics and the internal force variation of the pile-anchor support structure in the process of excavation by steps. By comparing the monitoring results of the projects and the numerical simulation results, we obtain the results showing that the crustal stress of the active earth pressure area state is changed after the pit excavation. With the increase of the excavation depth, the maximum horizontal displacement of the supporting piles goes down. At the same time, the pre-stressed anchor cable structure can effectively control the horizontal dis-placement of the supporting pi les. In addition, the analysis results show that the numerical method can be used as an effective method of research to provide a basis for the inforaiationalized construction and also have certain effects on the safe construction of foundation pits.