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基金项目:国家自然科学基金资助项目(52078142),广州市科技计划项目(202002030194)
作者单位
谢晟,韦巡洲 广东省地质建设工程集团公司 
摘要:
      依托某大厦基坑支护工程项目,研究深厚软土地层中基坑开挖对涉支护结构下穿盾构隧道变形的影响规律。采用三维有限元数值模拟分析隧道顶部支护桩的长度对支护结构变形和隧道隆起的影响,并将数值模拟结果与现场监测结果进行对比。结果表明:深厚软土地层中基坑开挖对下穿盾构隧道产生了较大的隆起变形;因下穿隧道的影响,隧道顶部支护桩嵌固深度的减小对支护结构的变形和下穿隧道的隆起会产生重要影响,当支护桩底与隧道顶的竖向间距S>4 m或支护桩边缘与隧道边缘的水平间距S1>4 m 时,支护桩的踢脚位移和下穿隧道的隆起变形迅速增加。研究成果可为类似工程提供应用参考和理论支撑。
关键词:深基坑;深厚软土地层;下穿隧道;隧道变形;三维有限元模型  数值模拟分析
Abstract:
      Based on the foundation pit supporting project of a building, this paper studies the influence rule of foundation pit excavation in deep thick soft ground on the deformation of the underneath shield tunnels with supporting structure. 3D finite element numerical simulation was used to analyze the influence of the length of the supporting pile at the top of the tunnel on the deformation of the supporting structure and tunnel uplift while the numerical simulation results were compared with the field monitoring results. The results show that pit excavation in deep soft ground produces large uplift deformations in the underneath shield tunnels. Due to the influence of the underneath tunnels, the reduction in the embedded depth of the supporting pile at the top of the tunnel has an important effect on the deformation of the supporting structure and the uplift of the underpass. When the vertical spacing between the bottom of the supporting pile and the top of the tunnel is greater than 4 m or the horizontal spacing between the edge of the supporting pile and the edge of the tunnel is greater than 4 m, the deformation of the supporting pile and underpass tunnel increases rapidly. The research results can provide application reference and theoretical support for similar projects.
Keywords:deep foundation pit  deep-thick-soft ground  underneath tunnel  tunnel deformation  3D finite element model  numerical simulation analysis
谢晟,韦巡洲.基坑开挖对涉支护结构下穿盾构隧道变形的三维模拟与影响规律研究[J].地质学刊,2022,46(2):214-220