1. Engineering Research Center of Railway Environmental Vibration and Noise, Ministry of Education, East China Jiaotong University, Nanchang 330013, China;
2. Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, Shanghai 201804, China;
3. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
4. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China;
5. Institute of Geotechnical Engineering, Ningbo University, Ningbo 315211, China
To explore the influences of surface surcharge on the existing shield tunnels buried in soft and hard soil strata, the scaled model tests on the interaction between shield tunnels and strata are carried out, and the tunnel deformation, earth pressure and soil settlement under surface surcharge are measured. Analysis of model test results shows that under the same surface surcharge, larger deformation is induced for the tunnel buried in soft soils than in hard soils. As the compression modulus of the soil strata is small, the overlaying soils over the tunnel exhibit passive earth arch pressure under surface surcharge. Under the large compression modulus of the soil strata, the overlaying soils over the tunnel show active earth arch pressure. The relation between the vertical convergence deformation of the tunnel and the vertical compression of the soil strata indicates that both the stiffness of cross section of shield tunnel and the compression modulus of soil strata determine the settlement state of the overlaying soils over the tunnel, and thus decide the influences of surface surcharge on the existing shield tunnels. The research results qualitatively reveal the reason of the mechanism why the oversized deformation is easily induced for the existing shield tunnels under surface surcharge.
黄大维, 周顺华, 冯青松, 李雪, 封坤, 黄强. 地表超载对软、硬地层中既有盾构隧道影响的试验研究[J]. 岩土工程学报, 2019, 41(5): 942-949.
HUANG Da-wei, ZHOU Shun-hua, FENG Qing-song, LI Xue, FENG Kun, HUANG Qiang. Experimental study on influences of surface surcharge on existing shield tunnels buried in soft and hard soils. Chinese J. Geot. Eng., 2019, 41(5): 942-949.
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