摘要
福平铁路岱岭段斜下穿一栋6层宿舍楼,楼房基础形式为桩径0.8m的人工挖孔灌注桩和柱下独立基础,桩长4~6m,隧道拱顶距最近桩基底端约12m,为保障楼房安全,针对掘进导致的桩基沉降变形开展模拟研究。结果表明,随开挖距离的逼近,隧道拱顶位移与桩基沉降量逐渐增大,开挖断面处于建筑最下方时增长速率最快,桩基产生不均匀沉降,其中最大沉降值为11.6mm。通过验算确定该沉降不致造成楼房结构性损伤。
The railway section of Dai Ling in Fuping crosses under the dormitory. The building foun-dation form is artificial digging pile of 0. 8 m pile diameter and independent foundation under column, and the pile length is 4？6 m. The distance between the top and bottom of the tunnel is about 12 m. In order to ensure the safety of buildings, simulation analysis is used to research the pile foundation settlement deformation caused by excavation. Results show that the displacement of tunnel vault and surface settlement gradually increase with the advance of excavation distance. The growth rate is fas-test when the excavation section is at the bottom of the building. Pile foundations emerge uneven set-tlement, and the maximum sedimentation value is 11. 6 mm. Through the calculation, it is concluded that the settlement will not affect the structural damage.
出处
《交通科技》
2017年第2期86-89,共4页
Transportation Science & Technology
关键词
浅埋隧道
下穿楼房
桩基位移
地基沉降
shallow tunnel
down across the building
pile foundation displacement
foundation settle-ment
