紧邻隧道的大型基坑变形控制设计  

Deformation Control Design of Large Foundation Excavation Adjacent to Tunnel

作　　者：王小波[1] 章良兵 王笃礼 WANG Xiaobo;ZHANG Liangbing;WANG Duli(AVIC Institute of Geotechnical Engineering Co.,Ltd.,Beijing 100098,China;Shanghai Investigation,Design and Research Institute Co.,Ltd.,Shanghai 200434,China)

机构地区：[1]中航勘察设计研究院有限公司,北京100098 [2]上海勘测设计研究院有限公司,上海200434

出　　处：《施工技术（中英文）》2023年第1期114-118,共5页Construction Technology

摘　　要：基坑开挖产生的变形将影响邻近既有铁路隧道的安全与正常运营,如何控制变形是基坑支护设计亟待解决的问题。针对紧邻既有铁路隧道的某人防基坑工程,采用桩锚支护、土压平衡开挖、土工格栅回填等方法进行基坑支护设计。同时,利用隧道和基坑的变形监测数据分析了基坑开挖和回填对既有铁路隧道和支护结构变形的影响。分析结果表明:支护方案能有效控制紧邻大型基坑的隧道变形;桩锚支护可以有效控制围护桩的侧向位移;土压平衡开挖可以平衡隧道两侧的土压力,减小开挖对支护结构侧向位移的影响;土工格栅回填可进一步控制支护结构的侧向位移。The deformation caused by excavation will affect the safety and normal operation of adjacent existing railway tunnels.How to control the deformation is an urgent problem to be solved in foundation excavation support design.For a civil air defense foundation excavation project adjacent to an existing railway tunnel,the design of foundation excavation support was carried out by means of pile-anchor support,earth pressure balance excavation and geogrid backfill.Meanwhile,the influence of excavation and backfilling on the deformation of existing railway tunnel and supporting structure was analyzed by using the deformation monitoring data of tunnel and foundation excavation.The analysis results show that the support scheme proposed in this paper can effectively control the deformation of the tunnel adjacent to the large foundation excavation.Pile-anchor support can effectively control the lateral displacement of retaining pile.Earth pressure balance excavation can balance the earth pressure on both sides of the tunnel and reduce the influence of excavation on the lateral displacement of supporting structure.Geogrid backfill can further control the lateral displacement of supporting structure.

关 键 词：基坑 桩锚支护 土压平衡开挖 土工格栅 变形 监测 

分 类 号：TU473.2[建筑科学—结构工程]