基坑不同支护结构的数值模拟分析

Numerical Simulation of Different Supporting Structure of Foundation Pit

随着经济的发展,基坑工程得到广泛的应用。为研究不同支护结构对基坑的支护效果,为类似工程设计施工提供指导及参考,运用三维有限差分软件FLAC3D对基坑施工过程进行数值模拟,对开挖过程中岩土体变形特征其时效变化规律进行分析。在此基础上修改模型,对不同支护结构在基坑开挖支护过程中所起的作用进行研究。结果表明,锚杆及小导管注浆对抑制基坑上部变形、防止基坑发生上部垮塌有非常明显的作用,喷混凝土护壁对抑制基坑中部变形、防止基坑发生鼓胀破坏有良好的支护效果。

With the economic development the foundation pit project has been widely used. In order to study the supporting effect of different supporting structures on foundation pit and provide practical reference and guidance in the design and construction process of similar projects,this paper adopted three-dimensional finite difference software FLAC3 Dto simulate the construction process of the foundation pit and the deformation characteristics and regular pattern of aging change in the excavation process. Through modifying the model and adjusting the parameters and the number of the supporting structure,the different effects of different supporting structures were analyzed and evaluated. The results show that the anchor rod and leading conduit have obvious effects on restraining the upper deformation of foundation pit and preventing the pit from collapsing,and the shotcrete wall play a key role in controlling the deformation in the middle of the foundation pit and preventing the pit from bulging damage.