盖挖法基坑开挖对临近桥梁桩基的影响研究  

Impact study of cover-and-cut excavation method on adjacent bridge pile foundations

作　　者：曹虹 杜鹏 盛健超 田俊豪 王哲[2] Cao Hong;Du Peng;Sheng Jianchao;Tian Junhao;Wang Zhe(Tengda Construction Group Co.,Ltd.,Shanghai 201204,China;College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310013,China)

机构地区：[1]腾达建设集团股份有限公司腾达研究院,上海201204 [2]浙江工业大学土木工程学院,杭州310013

出　　处：《工程勘察》2024年第7期22-26,共5页Geotechnical Investigation & Surveying

摘　　要：城市交通建设往往临近既有建筑结构,为了掌握盖挖法深基坑开挖对临近桥梁桩基的影响,依托之江路输水管廊及道路提升工程,建立数值模型并对工程现场展开监测,分析对比了基坑开挖导致的围护结构变形及桥桩变形规律。结果表明:围护结构最大位移出现在基坑北侧坑中坑开挖后,为6.14mm,最大位移深度随基坑开挖而下移,且坑中坑开挖完成后,其对侧围护结构变形反而减小,坑中坑开挖布置在敏感结构对侧时对临近结构具有一定控制效果;桥梁桩基最大沉降出现在首道混凝土支撑安装后,但随基坑开挖而逐渐减小,盖挖造成的沉降主要水平影响范围距围护结构约为12.71m,对邻近桥桩的影响主要发生在基坑开挖的早期阶段,各项变形均在安全范围内,且不均匀沉降控制效果明显。Urban transportation construction often involves existing building structures.In order to understand the impact of deep excavation using the cover-and-cut excavation method on adjacent bridge pile foundations,a numerical model was established and monitoring was conducted at the construction site of the Zhijiang Road water pipeline tunneling and road improving project.The deformation of lateral support structure and bridge piles caused by the excavation was analyzed.The results show that the depth of maximum displacement on support structure shifts downwards with the excavation progress.The maximum displacement is 6.14mm appears after the excavation of the inner pit in the north side of the pit,and the displacement of the adjacent retaining wall decreases after the completion of the inner excavation.The maximum settlement of the bridge pile foundations appears after the installation of the first concrete bracing,but gradually decreases with the excavation.The main affected horizontal range is approximately 12.71m from the edge of enclosure structure,and all deformations are within the safety limit.

关 键 词：盖挖法 临近桥梁 桩基变形 地表沉降 地连墙变形 坑中坑开挖 

分 类 号：TU449[建筑科学—岩土工程]