中国铁道科学2011，Vol.32Issue(1)：75-80,6.
采用长距离水平冻结暗挖法的浅埋大断面地铁隧道施工技术
Construction Technique for the Shallow-Buried Subway Tunnel with Large-Section by Long-Distance Horizontal Ground Freezing Method and Undermining Method
摘要
Abstract
Based on the artificially frozen soil test, finite element numerical simulation and large-scale physical model test, the construction technology of long-distance horizontal ground freezing method and undermining method adopted for the construction of shallow-buried subway tunnel with large-section was studied. The physical and mechanical indexes of the frozen soil were obtained after the artificially frozen soil test on the in-situ undisturbed soil sample. The finite element numerical analysis results indicate that the strength and the stability of the frozen wall are improved along with the increase of the frozen wall thickness. The results of the large-scale physical model test show that both the frost heaving and the thawing settlement increase obviously with the thickness of the frozen wall. It is predicted that when the thickness of the frozen wall is 4.5 m, the surface frost heaving and the thawing settlement both have exceeded the allowable values in the practical engineering. The design and optimization of the freezing construction scheme were conducted according to the above research results. During the construction process,the connection mode was improved for the long-distance horizontal freezing pipe, and the new technology of drilling with simultaneous casing was adopted to ensure the completion quality of the freezing holes.The surface frost heaving and thawing settlement were effectively controlled by several technical measures,such as applying pressure relief vents, increasing brine flow, tracing and grouting the thawing settlement,which ensured the successful completion of the engineering.关键词
地铁隧道/水平冻结暗挖法/冻土试验/有限元数值分析/大型物理模型试验/施工技术分类
交通工程引用本文复制引用
姚直书,蔡海兵,程桦,马进..采用长距离水平冻结暗挖法的浅埋大断面地铁隧道施工技术[J].中国铁道科学,2011,32(1):75-80,6.基金项目
国家自然科学基金资助项目(51044004) （51044004）
安徽省自然科学基金资助项目(090414165) （090414165）
安徽省高等学校省级自然科学研究重点资助项目(KJ2009A010) （KJ2009A010）
