北京交通大学学报2024，Vol.48Issue(1)：11-19,9.DOI:10.11860/j.issn.1673-0291.20230070
盾构隧道下穿对高速铁路CFG桩复合路基影响规律研究
Research on impact pattern of shield tunnel underpass on CFG pile composite roadbed of high-speed railways
摘要
Abstract
Addressing the unclear response mechanism of CFG pile composite roadbed to groundsettlement and the lack of theoretical foundation for predicting and controlling roadbed settlement during the construction of urban subway tunnels beneath high-speed railways, this study leverages the engineering project where the Zhengzhou Rail Transit Line 8 shield section crosses under the throat area of Zhengzhou East Railway Station. It introduces a method for predicting the settlement of CFG pile composite foundations. Analyzing the reinforcement effect of CFG piles on the roadbedbased on ground reinforcement theory and employing physical model experiments, this research in-vestigates the pattern of influence exerted by shield tunnel crossings on the CFG pile composite foun-dations of high-speed railways. The research results indicate that CFG piles significantly enhance the roadbed's compression modulus without compromising the composite foundation's integrity. The deformation pattern of the composite roadbed aligns with Peck's settlement curve. Addition-ally, CFG pile composite roadbed increase the ground layer's equivalent internal friction angle by approximately 50％, thus reducing ground settlement by about 23％. The maximum settlement in-duced by shield tunnel crossings in the CFG pile composite foundation is recorded at 1.65 mm. Sig-nificant ground settlement deformation begins when the shield tunnel face is 10 m from the roadbed centerline, with 83.6％ of the settlement occurring during the shield crossing phase. As the shield moves away, the settlement of the roadbed continues to increase, suggesting the need for settlement monitoring to persist until stabilization is achieved. These results offer valuable insights for the settlement prediction and reinforcement of CFG pile composite roadbed in scenarios involving shield tunnel underpassing high-speed railways.关键词
盾构下穿/高铁路基/CFG桩/地层沉降/影响规律Key words
shield tunnel underpass/high-speed railway roadbed/CFG pile/ground settlement/impact pattern分类
交通运输引用本文复制引用
杜家庆,豆海涛,郭华伟,史小萌,邓廷邦,王承亮..盾构隧道下穿对高速铁路CFG桩复合路基影响规律研究[J].北京交通大学学报,2024,48(1):11-19,9.基金项目
北京市自然科学基金(8214052)Beijing Municipal Natural Science Foundation(8214052) （8214052）
