地铁车站深基坑邻近浅基础房屋保护措施研究

Study on the Protective Measures for the Shallow Foundation Houses Adjacent to Deep Foundation Pit of a Metro Station

文章以深厚软土场地上地铁车站深基坑开挖对邻近两排房屋的影响为研究对象,探讨了隔离桩和锚杆静压桩组合加固措施对房屋的保护作用。通过建立二维平面应变有限元分析模型,模拟隔离桩桩径、桩长和桩位对第一排房屋沉降影响规律,提出了合理的桩长、桩径和桩位设计参数。针对提出的隔离桩设计参数,模拟计算无隔离桩及锚杆静压桩加固措施、有隔离桩无锚杆静压桩加固措施、无隔离桩有锚杆静压桩加固措施和有隔离桩及锚杆静压桩加固措施四种工况下前后两排房屋沉降变形情况,从而合理准确地预测地铁车站深基坑开挖施工对邻近房屋安全影响程度。

In this paper the influence of the deep foundation pit excavation in deep soft soil layer on adjacent two rows of houses was studied,and the protective effect of the combined consolidation method of the isolation pile and anchor rod static pressure pile was discussed.Through a two-dimensional plane strain finite element analysis model, a simulation of isolation pile diameter,pile length and pile position on the settlement of the first row of housing was conducted,and the reasonable design parameters of pile length,pile diameter and pile position were presented.Furthermore simulated calculations of housing settlements were conducted regarding the four cases of having no isolation pile and anchor bolt static pressure pile,having isolation pile but without anchor bolt static pressure pile,having no isolation pile but with anchor bolt static pressure pile,and having isolation pile and anchor bolt static pressure pile,and finally the effect of deep foundation pit excavation of the metro station on the safety of adjacent housing was predicted reasonably.