摘要
基坑开挖的稳定性问题是工程领域的研究热点,尤其对于强渗透性地层,需要重点考虑渗透作用对基坑开挖的不利影响。研究基于某越江通道段的工程实际,建立PLAXIS有限元模型来进行数值分析。充分考虑土体的弹塑性并选定相应的本构模型,基于现场实测数据标定模型材料参数。在建模过程中进行网格划分、设置荷载及边界条件来考虑地下水的渗流作用,并通过定义工作步来模拟实际的开挖过程。最后基于有限元模型,分析了各阶段变形与应力,得到了基坑具体的位移和力响应,研究了开挖过程中基坑的渗流稳定性。同时针对性分析了水位变化对结构稳定性的影响,研究成果可为渗流作用下深基坑施工提供切实可行的指导建议。
The stability of foundation pit excavation has long been a focal point of research in the engineering field,particularly for highly permeable strata,where the adverse effects of seepage on excavation must be carefully considered.This study is based on the engineering context of a river-crossing tunnel section,utilizing the PLAXIS finite element software to establish a numerical model for analysis.The elastoplastic behavior of the soil is fully accounted for,and an appropriate constitutive model is selected,with model material parameters calibrated based on field-measured data.During the modeling process,mesh generation,load application,and boundary condition settings are employed to incorporate the influence of groundwater seepage,while the actual excavation process is simulated through the definition of working steps.Finally,based on the finite element model,the deformation and stress at each stage are analyzed,yielding specific displacement and force responses of the foundation pit.The seepage stability during the excavation process is investigated,and the impact of water level changes on structural stability is specifically analyzed.The research findings provide practical guidance for the construction of deep foundation pits under seepage conditions.
出处
《建筑技术开发》
2026年第2期122-124,共3页
Building Technology Development
关键词
渗流作用
基坑开挖
数值模拟
稳定性分析
seepage
foundation pit excavation
numerical simulation
stability analysis
