邻近地铁隧道与桩基桥梁基坑工程稳定性分析  

作　　者：邓伟明 方伟 任兵强 孔维智 

机构地区：[1]中铁三局集团有限公司,北京102300 [2]山东科技大学土木工程与建筑学院,山东青岛266590 [3]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590

出　　处：《科技创新与应用》2025年第6期48-51,55,共5页Technology Innovation and Application

摘　　要：结合青岛市重庆中路西侧电力隧道基坑开挖的工程实例,使用数值模拟的方法,针对放坡开挖基坑对既有地铁隧道及桥梁桩基的综合影响展开研究。结果表明,该工程的放坡基坑开挖对地铁隧道和桥梁桩基影响较小,方向都朝向基坑方位,且变形随着基坑开挖深度的增加而逐步增大。放坡开挖主要集中在基坑底部,变形方向向上隆起,隆起的程度随着基坑的开挖即土体的卸荷而逐渐增大。基坑开挖的过程中桩基自身只存在正弯矩或负弯矩,不存在反弯点,自身不会因为弯矩的突变受到不同的弯曲效应,导致桩基被破坏。该工程为浅基坑,且距离地铁隧道较远,对隧道的影响并不大,并不需要控制结构进行保护。Based on the engineering example of foundation pit excavation of a power tunnel on the west side of Chongqing Middle Road in Qingdao City,the comprehensive impact of sloping excavation of foundation pit on existing subway tunnels and bridge piles is studied using numerical simulation methods.The results show that the sloping foundation pit excavation of this project has little impact on the subway tunnel and bridge pile foundation,and the directions are all towards the foundation pit,and the deformation gradually increases with the increase of the foundation pit excavation depth.Slope excavation is mainly concentrated at the bottom of the foundation pit,and the deformation direction bulges upward.The degree of bulge gradually increases with the excavation of the foundation pit,that is,the unloading of the soil.During the excavation of the foundation pit,the pile foundation itself only has positive or negative bending moments,and there is no reverse bending point.It will not suffer different bending effects due to sudden changes in the bending moment,causing the pile foundation to be destroyed.The project is a shallow foundation pit and is far away from the subway tunnel.The impact on the tunnel is not significant and does not require a control structure for protection.

关 键 词：基坑工程 放坡开挖 邻近隧道 邻近桥梁 变形特性 

分 类 号：U445[建筑科学—桥梁与隧道工程]