隧道不同位置下穿施工引起邻近建筑物的变形分析

发布时间：2018-10-12 14:19

【摘要】：针对龙厦铁路石桥头隧道工程埋深浅、地表建筑物密集,且多为砖混结构的特点,应用数值分析手段,通过建立隧道-建筑物的三维数值分析模型,分析了在不同下穿位置的隧道施工条件下,邻近建筑物的变形性状。结果表明:各位置处的建筑物沉降受夹角α变化的影响不大,当建筑物中心偏离隧道中心一定距离,使得建筑物近隧道端位于隧道中心正上方时,建筑物沉降达到最大。墙体垂直于隧道走向时,建筑物仅在垂直方向发生局部倾斜,墙体斜交隧道走向时,建筑物将发生纵、横双向倾斜。建筑物中心与隧道中心之间的距离D小于1倍隧道直径时,建筑物发生下凹挠曲,D大于1倍隧道直径时,建筑物发生上凸挠曲,距离D为隧道半径的5倍时,挠曲值仅为最大值的1/5。建筑物仅在墙体斜交隧道走向时才发生扭转变形,最大扭转变形量发生在建筑物处于D=0m,α=45°位置时。墙体拉应变根据建筑物所受变形作用的形式而呈现相应的分布规律,当受到复合变形作用时,建筑物往往处于不利位置。
[Abstract]:In view of the characteristics of shallow buried, dense surface buildings and mostly brick-concrete structures in Shiqiao head Tunnel of Long-Xia Railway, a three-dimensional numerical analysis model of tunnel-building is established by means of numerical analysis. The deformation behavior of adjacent buildings under the condition of tunnel construction with different underpass positions is analyzed. The results show that the settlement of buildings at different positions is not affected by the change of angle 伪. When the center of the building deviates from the center of the tunnel at a certain distance, the settlement of the building reaches the maximum when the near end of the tunnel is located directly above the center of the tunnel. When the wall is perpendicular to the tunnel direction, the building will only have a partial tilt in the vertical direction, and when the wall inclined towards the tunnel, the building will be inclined in both vertical and horizontal directions. When the distance between the center of the building and the center of the tunnel is less than 1 times the diameter of the tunnel, the concave flexure occurs in the building, and when D is greater than 1 times the diameter of the tunnel, the upper convex flexure of the building occurs, and the distance from D is 5 times the radius of the tunnel. The flexure value is only 1 / 5 of the maximum value. The maximum torsional deformation occurs when the building is in the position of D0 m, 伪 = 45 掳. The tensile strain of the wall is distributed according to the form of the deformation of the building. When the wall is subjected to the compound deformation, the building is often in a disadvantageous position.
【作者单位】：长沙理工大学;
【基金】：湖南省教育厅高等学校科学研究重点项目(10A007)
【分类号】：U455

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