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通过对石家庄市某20.0 m深基坑桩锚支护结构的桩顶水平位移、深层水平位移和建筑物沉降的现场观测,探讨了支护结构位移与周边建筑物沉降的变化规律。观测分析结果表明:桩顶水平位移整体分布表现出明显的空间效应,阳角位置大,阴角位置小,同一支护边长范围内的水平位移中间大,边角小;支护桩深层水平位移呈鼓肚状,表现为中间大,顶部次之,底端最小的分布特征;建筑物沉降随基坑开挖逐渐增大,最后趋于稳定,沉降速率表现出前期小,中期大,后期稳定的变化特点。现场观测结果表明,该基坑支护结构的设计方案能有效控制变形,满足规范要求,可为类似工程提供参考与借鉴。
Through the on-the-spot observation of pile top displacement, deep horizontal displacement and building settlement of a 20.0 m deep foundation pit supporting structure in Shijiazhuang city, the variation regularity of the displacement of supporting structure and the settlement of surrounding buildings is discussed. The results of observation and analysis show that the overall horizontal displacement of pile top shows obvious spatial effect. The position of male corner is large, the position of female corner is small, and the horizontal displacement of the same side is large and the corner is small. Displacement was bulging, showing the distribution characteristics of the middle large, followed by the bottom, the bottom of the smallest distribution; building settlement increases with the pit excavation and finally stabilized, the settlement rate showed early small, medium and large, late Stable change characteristics. The observation results show that the design of the foundation pit supporting structure can effectively control the deformation and meet the requirements of the code, which can provide reference and reference for similar projects.