岩土工程学报2025，Vol.47Issue(11)：2255-2263,9.DOI:10.11779/CJGE20241058
盾构下穿既有隧道诱发沉降后注浆抬升试验研究
Experimental study on grouting uplift after settlement induced by shield tunneling under existing tunnels
摘要
Abstract
To investigate the efficacy of the bag grouting technique in mitigating settlement induced by shield tunneling,a distinct grouting process is formulated subsequent to the completion of a model test simulating the said scenario.Subsequently,an uplift test is conducted to evaluate the technique's impact on the tunnel's flexural deformation,settlement,and changes in additional earth pressure exerted on the superstructure during the grouting-induced settlement test of an existing tunnel beneath a shield tunnel.The experimental findings reveal transverse elliptical deformations occurring within a zone of 120 cm to 250 cm from the northern terminus of the tunnel.Notably,a significant uplift in the superstructure is observed at this location,with the peak uplift reaching approximately 15 mm at the tunnel's midpoint.The greatest increment in additional earth pressure is recorded at the tunnel's midpoint as well.During the grouting operation,the bag grouting method exerts a robust binding effect on the grouting slurry and concentrates the slurry pressure predominantly around the injection point,thereby inducing a soil arching effect in the adjacent soil mass.In practical engineering,it is recommended to employ concurrent multi-point grouting to elevate the tunnel as a integral unit,thereby restoring the tunnel's internal forces and structural configuration to their pre-underpass conditions.Moreover,enhanced monitoring of the tunnel's uplift should be implemented throughout the grouting phase to avert excessive uplift.关键词
盾构隧道/模型试验/囊袋注浆/盾构下穿/注浆抬升Key words
shield tunnel/model test/bag grouting/shield through/grouting uplift分类
交通工程引用本文复制引用
黄大维,胡新平,耿大新,樊潇宇,杨威..盾构下穿既有隧道诱发沉降后注浆抬升试验研究[J].岩土工程学报,2025,47(11):2255-2263,9.基金项目
国家自然科学基金项目(52378398) （52378398）
江西省主要学科学术和技术带头人领军人才项目(20232BCJ22009) （20232BCJ22009）
江西省自然科学基金项目(20242BAB26077)This work was supported by National Natural Science Foundation of China(Grant No.52378398),Jiangxi Province Major Discipline Academic and Technical Leader Leading Talent Project(Grant No.20232BCJ22009),and Jiangxi Provincial Natural Science Foundation(Grant No.20242BAB26077). （20242BAB26077）
