【摘要】 在软土地区深基坑工程中，承压水引发的突涌事故是重大安全隐患之一。我国现行规范主要采用压力平衡法对基坑突涌稳定性进行验算，但该方法忽略了工程桩对基坑抗承压水突涌的有利作用。本研究基于有限元数值模拟，系统研究了工程桩对基坑抗承压水突涌的影响规律。研究表明：工程桩的存在能够有效提升基坑的稳定性，同时，随着工程桩进入承压含水层深度的增加，其提升作用不断增强；当工程桩进入承压含水层深度达到某一临界值时，突涌破坏模式由整体顶升转变为塑性滑移，工程桩的抗承压水突涌提升效果达到极限。在本文计算条件下，工程桩进入承压含水层的临界深度约为隔水层厚度的1.3倍，基坑抗承压水突涌稳定性（以临界承压水头表征）提高约16.24%。本文揭示了工程桩对基坑抗承压水突涌的影响规律，提出了基于临界深度判别突涌破坏模式的方法，对地下室底板施工前的深基坑工程抗承压水突涌研究具有重要的理论意义及工程应用价值。更多还原

【Abstract】 In deep excavation projects in soft soil areas, water inrush induced by confined groundwater is one of the major safety hazards. At present, the prevailing design codes in China mainly adopt the pressure equilibrium method to evaluate the stability of deep excavations against confined water inrush, while the beneficial effect of engineering piles on resisting water inrush is neglected. Based on finite element numerical simulations, this study systematically investigates the influence of engineering piles on the resistance of deep excavations to confined water inrush. The results indicate that the presence of engineering piles can significantly enhance excavation stability. As the penetration depth of the piles into the confined aquifer increases, their contribution to improving the resistance against water inrush continuously increases.When the pile penetration depth reaches a critical value, the water inrush failure mode changes from overall uplift to plastic sliding, and the enhancement effect of engineering piles on anti-water inrush stability reaches a limiting value.Under the conditions considered in this study, the critical penetration depth of foundation piles into the confined aquifer is approximately 1.3 times the aquitard thickness, leading to an approximately 16.24% increase in excavation stability against confined water inrush, as indicated by the critical confined water head. This study reveals the influence law of engineering piles on the resistance to confined water inrush in deep excavations, and proposes a method for identifying the inrush failure mode based on the critical penetration depth. The findings hold significant theoretical importance and engineering application value for research on confined water inrush resistance in deep excavations prior to the construction of the basement floor slab.更多还原