紧邻深基坑施工的风险分析及三维数值模拟

通过结合两紧邻深基坑项目的工程地质条件及基坑支护结构设计特点,进行了基于现行设计方案的风险分析。并结合数值分析手段,模拟了紧邻深基坑工序交错施工、角撑区域有无新增锚索及坑间局部带状软弱层加固与不加固对深基坑围护桩水平位移的影响。结果表明:施工进度是影响基坑围护桩水平位移的重要因素;角撑区域新增锚索及坑间局部带状软弱层的加固均可有效减小基坑围护桩的水平位移。最后提出了经济、有效的安全保护措施,为两紧邻深基坑的设计与施工提供依据。

Risk Analysis and 3D Numerical Simulation on Construction of Neighboring Deep Foundation Excavations

Risk analysis is made based on current design scheme by combining with the engineering geological condition and design characteristics of support structure of neighboring deep foundation excavations.The horizontal displacements of retaining piles of the two deep foundation excavation is comparatively simulated under the influence of staggered construction process in neighboring deep foundation excavations,setting new anchor in corner brace area and reinforcing local zones soft layer between the two foundation excavations.The results indicate that construction schedule is an important factor which influences horizontal displacement of retaining pile of foundation excavation;new anchor in corner brace area and the reinforcement of local zonal soft layer between the foundation excavations can reduce horizontal displacement of retaining piles effectively.Eventually,some economical and effective security protection measures have been put forward to provide the basis for design and construction of neighboring deep foundation excavations.