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随着工程建设的不断发展,深基坑工程层见叠出,而深基坑坑底一般会有密集的工程桩。目前,国内外对于坑底工程桩的研究尚不全面,实际工程中常因对此了解不深而开挖不合理产生工程事故或盲目打桩导致资源浪费。主要以坑底无桩和坑底群桩两种基坑为研究对象,通过有限元软件ABAQUS,对比分析了开挖结束时墙后地表位移,坑底土体隆起,围护结构变形、弯矩以及侧向土压力的变化,分别得出了深开挖卸载条件下基坑的变形性状和围护结构的应力特征;最后考虑坑底单桩的模型,分析了不同开挖步骤时桩土相对位移、桩身轴力和侧摩阻力的变化,得出了深开挖卸载条件下桩基的受力特性。
With the continuous development of engineering construction, deep foundation pit engineering see layer stack, and deep foundation pit bottom will generally have intensive engineering pile. At present, the domestic and international research on pit-bottom engineering piles is not comprehensive yet. In practical engineering, it is often not known because of this lack of knowledge that excavation is irrational and engineering accidents or blind piling lead to waste of resources. The two types of foundation pit with no pits at the bottom and piles at the bottom of pits are taken as the research object. Through the finite element software ABAQUS, the displacement of the wall after the excavation, the uplift of the soil at the bottom of the pit, the deformation of the retaining structure and the bending moment And the change of lateral earth pressure, the deformation characteristics of the foundation pit and the stress characteristics of the retaining structure under deep excavation and unloading are respectively obtained. Finally, considering the model of single piles at the bottom of pits, Displacement, axial force of pile and lateral friction, the stress characteristics of pile foundation under deep excavation and unloading condition are obtained.