深大基坑开挖对临近建筑的影响

INFLUENCE OF DEEP AND LARGE FOUNDATION PIT EXCAVATION ON ADJACENT BUILDINGS

鉴于城市中深大基坑的开挖会对临近的建筑物产生影响,文中基于有限元软件Midas GTS NX,模拟深大基坑在桩+支撑的支护工况下土方开挖对支护桩及临近建筑的影响。研究结果表明,基坑开挖过程中,支护桩的水平位移随开挖深度的增加而逐渐增大且有支撑部位的位移量明显小于支撑间的位移量;临边建筑的水平位移均随着开挖深度的增加而增加且有建筑物距离坑边的距离越近,建筑物的水平位移量受开挖深度的敏感性越大。

Aiming at the impact of the excavation of deep and large foundation pits in cities on adjacent buildings,a numerical model of the impact of earthwork excavation on supporting piles and adjacent buildings under the supporting condition of pile support is established by the finite element software Midas GTS NX.The results show that the horizontal displacement of the retaining pile increases with the increase of the excavation depth,and the displacement of the supporting part is obviously smaller than that of the supporting part.The horizontal displacement of buildings near the edge increases with the increase of excavation depth,and the closer the buildings are to the pit edge,the greater the sensitivity of the horizontal displacement of buildings to the excavation depth.