软土区地铁工程深基坑降水施工数值模拟分析  

Numerical Simulation Analysis of Deep Foundation Pit Dewatering Construction of Subway Project in Soft Soil Area

作　　者：林华明 张盛滨 吴林涛[1,2] 黄腾枫 LIN Huaming;ZHANG Shengbin;WU Lintao;HUANG Tengfeng(Fujian Academy of Building Research Co.,Ltd.,Fuzhou 350025,China;Fujian Provincial Key Laboratory of Green Building Technology,Fuzhou 350108,China)

机构地区：[1]福建省建筑科学研究院有限公司,福建福州350025 [2]福建省绿色建筑技术重点实验室,福建福州350108

出　　处：《河南科技》2025年第6期66-70,共5页Henan Science and Technology

摘　　要：【目的】研究软土区地铁工程深基坑降水施工的渗流场及应力场变化规律。【方法】依托于福州某地铁站竖井工程,建立基于不同开挖步序及降水条件的有限元模型,分析降水施工过程中软土区基坑开挖渗流场及应力场的变化规律,并通过应力监测结果对比有限元模型的可行性,最后提出施工建议。【结果】研究结果表明,止水帷幕能够有效控制基坑内部地下水的孔压及流速,从而降低排水难度,由于排水固结的作用,竖向应力随开挖深度的增加,稳定性逐步提高,水平方向被动土压力增加迅速,水平应力随开挖深度的增加较为明显。【结论】施工时应加强下部结构的支护,以预防基坑在施工过程中发生失稳坍塌事故。[Purposes]This paper aims to study the change law of seepage field and stress field in dewatering construction of deep foundation pit of subway project in soft soil area.[Methods]This paper is based on the geological properties of a certain site in Fuzhou and establishes finite element models under different excavation sequences and groundwater conditions to analyze the changes in the seepage field and stress field during the excavation process in the soft soil area of a basement pit under groundwater control conditions.It also compares the feasibility of the finite element model through the stress monitoring results and finally proposes construction suggestions.[Findings]The research results show that the cutoff wall can effectively control the pore pressure and flow velocity of groundwater within the excavation,thereby reducing the difficulty of drainage.Due to the consolidation settlement effect,the vertical stress increases gradually as the excavation depth increases,and the stability improves.The passive earth pressure on the horizontal direction increases rapidly,and the horizontal stress increases more obviously as the excavation depth increases.[Conclusions]During construction,the reinforcement measures of the support system of the substructure should be strengthened to prevent the instability collapse of the foundation pit during construction.

关 键 词：软土区 深基坑降水 有限元 数值模拟 

分 类 号：TU753[建筑科学—建筑技术科学]