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深大基坑施工过程中,支护结构内力与变形监测研究是保证基坑稳定以及施工安全的重要手段之一。以深圳地铁11号线前海湾站基坑为研究对象,对基坑开挖施工过程中支撑轴力和围护桩桩体水平位移进行了现场监测。监测数据分析表明,基坑在开挖过程中,钢筋混凝土支撑轴力最大,第一道钢支撑施作,会显著减小混凝土支撑的轴力。基坑东西两侧围护桩桩身长度和土层分布的差异,导致了基坑两侧桩体位移变化趋势差别较大。
During the construction of deep foundation pit, the research on internal force and deformation monitoring of supporting structure is one of the important means to ensure the stability of foundation pit and construction safety. Taking the foundation pit of Qianhaiwan Station of Shenzhen Metro Line 11 as the research object, the on-site monitoring of supporting axial force and horizontal displacement of the retaining pile during excavation and excavation was carried out. Monitoring data analysis shows that during excavation, the axial force of reinforced concrete support is the largest. When the first steel support is applied, the axial force of concrete support can be significantly reduced. The difference of pile length and soil distribution on both sides of the foundation pit results in great differences in the displacement trend of the pile body on both sides of the foundation pit.