区间暗挖隧道侧穿既有桥桩施工扰动分析  

Construction Disturbance Analysis of Existing Bridge Piles Traversed by Interval Subsurface Excavation Tunnel

作　　者：黄鹂[1] 梁小勇[1] 李娴[1] 

机构地区：[1]河北科技大学建筑工程学院,河北石家庄050018

出　　处：《河南科技大学学报（自然科学版）》2016年第4期66-70,75,共6页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家杰出青年科学基金项目(51108020);河北省教育厅科技计划青年基金项目(QN2015062)

摘　　要：将三维数值计算和现场实测相结合,对区间暗挖隧道侧穿既有桥桩施工扰动进行了分析。分析结果表明:隧道开挖引起的既有桩体的位移响应表现出明显的空间效应,沿桩长的沉降差值主要是由桩基两侧的侧压力差异导致的。既有桩基沿X轴方向的位移呈"S"型,最大位移值位于桩顶;以隧道轴线为界,既有桩基X轴方向的位移模式不同。既有桩基Y轴方向的位移表现为抛物线型,最大值位于隧道轴线位置。弯矩沿桩长变化曲线有2个反弯点,最大值位于隧道轴线位置,桩体两侧地层侧压力不均衡导致桩体产生弯矩。The construction disturbance of existing bridge piles traversed by interval subsurface excavation tunnel was analyzed by 3D numerical analysis and site measurement. The results show that the spatial effect of existing bridge piles displacement response is significant which caused by tunnel excavation. The subsidence difference value is caused by difference side pressure along piles. The piles displacements show S pattern on X axis,and the maximum value locates at top of pile. The displacement pattern is different with the tunnel axe on X axis. The piles displacements show parabola pattern on Y axis,and the maximum value locates at tunnel axes. The bending moment of existing bridge piles have two recurvature points,and the maximum value locates at tunnel axes. The bending moment of existing bridge piles is caused by different side pressure along piles.

关 键 词：区间隧道 既有桥桩 施工扰动 轴力 数值计算 现场实测 

分 类 号：U45[建筑科学—桥梁与隧道工程]