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采用土体卸载的HS有限元模型研究地铁换乘站坑中坑坑趾系数α对支护结构和土体变形的影响。结果表明:外墙最大侧移随坑趾系数增大而显著减小,侧移位置上移,α从0.25增加到1.5,外墙最大侧移从44.96 mm减小到30.71 mm,侧移深度从18.875 m上移到16.0 m;内墙侧移随α增大而减小,α从0.25增加到1.5,内墙最大侧移从45.74 mm减小到24.48 mm,内墙墙顶竖向位移随α增大而增大;内坑坑底在内墙10 m范围内出现显著隆起区,最大隆起量随α增加而减小,隆起区外的隆起值稳定保持在90 mm左右;外坑坑底隆起随α增大而增大,最大隆起位置出现在内墙外侧边缘,外墙内侧边缘的挤压隆起随α增大而增大,隆起范围和隆起量都较为显著;外坑坑背沉降曲线相似,沉降量随α增大而减小。
Using the finite element model of soil unloading, the influence of the pit toe coefficient α of the pit in the subway transfer station on the deformation of supporting structure and soil was studied. The results show that the maximum lateral displacement of the external wall significantly decreases with the increase of the pit toe coefficient, the lateral shift position increases, α increases from 0.25 to 1.5, the maximum lateral shift of the external wall decreases from 44.96 mm to 30.71 mm, and the lateral shift depth from The 18.875 m upward move to 16.0 m; the internal wall lateral displacement decreases with increasing α, α increases from 0.25 to 1.5, the maximum lateral displacement of the internal wall decreases from 45.74 mm to 24.48 mm, and the vertical displacement of the inner wall wall top is α Increase and increase; within the inner wall of the inner pit, there is a significant uplift within 10 m, the maximum amount of uplift decreases with increasing α, the value of uplift outside the uplift remains stable at about 90 mm, and the height of the outer bottom of the pit rises. With the increase of α, the maximum bulging position appears on the outer edge of the inner wall, and the extrusion bulge of the inner edge of the outer wall increases with α, and the bulge range and uplift amount are all significant. The backside settlement curves of the outer pit are similar. , The settlement amount decreases with increasing α.