摘要
[目的]永临结合施工工艺将支护结构作为永久结构来协同受力,不进行拆换撑,与传统工艺力学发展规律不同。为确保工程安全,有必要探明该工艺下永临结合地下车站的力学发展规律。[方法]以济南某永临结合地下车站为研究对象,通过在工程中增设传感器,利用监测数据研究该工程施工全过程的力学发展变化,建立有限元模型,研究叠合结构的受力特点,并使用组合预测模型对主体结构内力进行预测,进而提出了可靠的数据预测模型。[结果及结论]侧墙主要呈现坑外侧受拉特点,负一层侧墙顶部与负二层侧墙底部为危险点。底板的关键阶段为水位恢复阶段,其弯矩主要由水荷载产生;中板在施工完成后状态保持稳定,其弯矩主要由混凝土自重产生;顶板的关键阶段为覆土回填阶段,其弯矩主要由混凝土自重与覆土荷载产生,增量较大。组合模型能够有效反映施工阶段侧墙的弯矩发展模式,其预测精度比单一模型精度更高。
[Objective]The permanent-temporary combined construction technology takes the support structure as a permanent one to jointly bear loads,without dismantling or replacing struts.Its mechanical development pattern differs from that of traditional methods.To ensure engineering safety,it is necessary to clarify the mechanical development law of underground stations constructed using this technology.[Method]Taking a permanent-temporary combined underground station in Jinan City as the research subject,sensors are added during construction,and monitoring data are used to investigate the mechanical development throughout the entire construction process.A finite element model is established to study the stress characteristics of the composite structure,and a combined prediction model is employed to predict the internal forces of the main structure,proposing further a reliable data prediction mode.[Result&Conclusion]The side walls mainly exhibit tensile behavior on the outside of the excavation pit,with the top of the B1 side wall and the bottom of the B2 side wall being identified as critical points.The key engineering stage of the base slab is the water-level recovery stage,during which its bending moment is primarily induced by water loads.The intermediate slab remains stable after construction completion,with its bending moment mainly generated by the self-weight of concrete.The key engineering stage of the roof slab is the soil backfill stage,where its bending moment is primarily caused by the self-weight of concrete and backfill loads,showing a significant increment.The combined model effectively reflecte the bending moment development pattern of the side walls during construction,demonstrating higher predictive accuracy than that of individual models.
作者
周浩
徐前卫
孙捷城
谢金利
龚杰
付艳艳
韩帅
ZHOU Hao;XU Qianwei;SUN Jiecheng;XIE Jinli;GONG Jie;FU Yanyan;HAN Shuai(Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Tongji University,201804,Shanghai,China;Jinan Rail Transit Group Co.,Ltd.,250013,Jinan,China;CCCC Road&Bridge Construction Co.,Ltd.101117,Beijing,China)
出处
《城市轨道交通研究》
北大核心
2026年第1期89-99,共11页
Urban Mass Transit
基金
国家重点研发计划项目(2023YFC3009400)
山东省重点研发计划项目(2021CXGC011203)。
关键词
地铁
装配式地下车站
结构内力
永临结合
数值模拟
机器学习
metro
prefabricated underground station
structural internal forces
permanent-temporary combination
numerical simulation
machine learning
