软土地区深大基坑工程施工技术研究

Research on Construction Technology of Deep and Large Foundation Pit Engineering in Soft Soil Area

以烟台市某安置房项目基坑工程为例,提出竖向分层、平面分区的总体施工方案,并借助现场监测技术对基坑支护的变形进行观测。结果表明,围护桩的水平位移呈先非线性增加后减小的趋势,水平位移峰值在不同开挖阶段的开挖面附近;围护桩水平位移峰值与开挖深度的下限关系为δ=0.11%h,上限关系为δ=0.30%h,在实际工程中可通过中间拟合关系δ=0.20%h进行围护结构的变形预测。

Taking the foundation pit engineering of a resettlement housing project in Yantai City as an example,this paper proposes a general construction plan of vertical stratification and plane zoning,and observes the deformation of the foundation pit support with the help of on-site monitoring technology.The results show that the horizontal displacement of the retaining pile increases nonlinearly and then decreases,and the peak horizontal displacement is near the excavation surface at different excavation stages.The relationship between the peak horizontal displacement of the retaining pile and the lower limit of the excavation depth isδ=0.11%h,and the upper limit relationship isδ=0.30%h.In practical engineering,the deformation prediction of the retaining structure can be carried out through the intermediate fitting relationshipδ=0.20%h.