基坑开挖对支护桩及临近建筑桩基的影响

INFLUENCE OF FOUNDATION PIT EXCAVATION ON SUPPORTING PILE AND PILE FOUNDATION OF ADJACENT BUILDINGS

鉴于城市建筑密度越来越高,基坑开挖会对其临近建筑桩基产生不利影响,文中基于有限元软件Midas GTS NX,模拟大面积降水后基坑开挖过程,研究土方开挖对支护桩及临近建筑桩基位移及内力的影响。研究结果表明,大面积降水后,随着基坑开挖深度的增加,支护桩的水平和竖向位移分别表现为逐渐增大和先减小后增大的变化规律;临坑建筑的桩基,其水平和竖向位移均表现出随着基坑开挖深度的增加而逐渐增大的变化趋势。

In view of the increasingly high density of urban buildings,the excavation of foundation pit will have adverse effects on the pile foundation of adjacent buildings.The excavation process of foundation pit after large area precipitation is simulated by Midas GTS NX software,and the impact of earthwork excavation on the displacement and internal force of the support pile and the pile foundation of adjacent buildings is studied.The results show that the horizontal and vertical displacements of the retaining piles increase gradually and decrease first and then increase with the increase of the excavation depth after large area dewatering.The horizontal and vertical displacements of the pile foundation of the building near the pit show a trend of increasing with the increase of the excavation depth of the foundation pit.