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以河南省洛阳市某湿陷性黄土基坑工程为例,结合其所在区域的地质条件、周边环境等,采用了桩锚支护的基坑支护方案。针对该支护方案,应用有限差分程序FLAC3D建模分析了不同工况下支护结构和坑周土体的变形规律,得出了坑周土体的位移随着距坑距离的增大逐渐减小;支护桩的水平位移随着开挖深度的增加,桩顶处位移不断增大,而桩底部的位移越来越小;坑周地表沉降和水平位移及支护结构变形均满足设计要求。同时,研究了湿陷性黄土对桩土位移的影响,结果表明,该支护方案较为合理,桩锚支护结构对深基坑的变形起到了很好的控制作用。研究结果可为黄土地区湿陷性条件下的基坑支护技术及理论研究提供参考。
Taking a collapsible loess foundation pit project in Luoyang City, Henan Province as an example, the foundation pit supporting scheme with pile and anchor support is adopted in combination with the geological conditions and the surrounding environment in the area where it is located. According to the support scheme, the finite difference program FLAC3D modeling is used to analyze the deformation law of the supporting structure and the soil around the pit under different conditions. The displacement of the soil around the pit is reduced with the increase of the distance of the pit The displacements of the pile bottom are smaller and smaller; the settlement and horizontal displacement of the pit surface and the deformation of the support structure meet the design requirements . At the same time, the effect of collapsible loess on pile-soil displacement is studied. The results show that the supporting scheme is reasonable and the pile-anchor supporting structure has a good control effect on the deformation of deep foundation pit. The results can provide reference for foundation pit supporting technology and theoretical research under collapsibility conditions in loess area.