紧邻建筑深基坑双排微型桩复合土钉墙支护研究

Composite Soil Nail Wall Support with Double Row Micro Piles for Deep Foundation Pit Adjacent to Buildings

以郑州市某紧邻建筑物的深大基坑为研究对象,提出一种基于双排微型钢管桩的复合土钉墙支护方式,运用FLAC3D数值模拟与监测数据进行对比分析。研究表明:基坑最大水平位移主要分布在基坑侧壁,最大隆起出现在基底远离侧壁的位置;深层水平位移在不同深度出现变化极值,坡顶竖向和水平位移值、临近建筑物最大沉降值都在警戒值范围内;双排微型钢管桩弯矩值呈斜“W”形分布,钢管桩轴力呈现分段性;双排微型钢管桩复合土钉墙支护方式能有效控制基坑变形,确保周边环境的安全。通过对模拟结果和监测结果的分析,对类似深基坑工程的支护设计和施工具有一定的参考价值。

Taking a deep and large foundation pit adjacent to a building in Zhengzhou as the research object,a composite soil nail wall support method based on double row micro steel pipe piles is proposed.FLAC3D numerical simulation and monitoring data are used for comparative analysis.Our result shows that the maximum horizontal displacement of the foundation pit is mainly distributed on the side wall of the foundation pit,and the maximum uplift occurs at the position where the base is far from the side wall.The deep horizontal displacement exhibits extreme changes at different depths,with vertical and horizontal displacement values at the top of the slope and the maximum settlement value of adjacent buildings far within the warning range.The bending moment values of double row micro steel pipe piles are distributed in an oblique"W"shape,and the axial force of the steel pipe piles is segmented.The double row micro steel pipe pile composite soil nail wall support method can effectively control the deformation of the foundation pit and ensure the safety of the surrounding environment.The analysis of simulation and monitoring results has certain reference value for the support design and construction of similar deep foundation pit projects.