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以某城市轻轨换乘车站深基坑为背景,对开挖过程中支护结构的监测数据进行详细分析,并采用有限差分软件进行数值模拟,与现场监测数据进行对比研究。重点分析了围护桩的水平位移和钢支撑轴力的变化规律。结果表明,在排桩-钢支撑支护体系下,基坑开挖初期,桩身变形呈前倾型,第一道钢支撑架设之后,桩身最大位移点逐渐下移,整体呈“大肚”状。钢支撑对基坑支护结构的侧向位移有良好的抑制作用,但受架设时间、立柱状态、材料和温度等多种因素影响,需谨慎对待。研究成果对类似基坑工程的设计与施工具有借鉴意义。
Taking the deep foundation pit of a city light rail transit station as a background, the monitoring data of the support structure in excavation process are analyzed in detail. The finite difference software is used to simulate it and compared with the on-site monitoring data. Focusing on the analysis of the horizontal displacement of retaining pile and steel support axial force variation. The results show that in the early stage of excavation, the deformation of the pile body is predominantly inclined under the piled-steel support system, and the maximum displacement point of the pile body gradually decreases after the first steel support is erected. Belly "shape. Steel support has a good restraining effect on the lateral displacement of the foundation pit supporting structure. However, it should be treated with caution due to various factors such as erecting time, column status, material and temperature. The research results have reference significance for the design and construction of similar foundation pit engineering.