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| Effect of shallow tunnel construction by horizontal freezing on adjacent orthogonal subgrades |
| DONG Jianhua1，2，WU Xiaolei1，2，SHI Lijun1，2，KOU Haijun3 |
| (1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province，Lanzhou University of Technology，Lanzhou，Gansu 730050，China；2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education，Lanzhou University of Technology，Lanzhou，Gansu 730050，China；3. China Railway 19 Bureau Group Co.，Ltd.，Beijing 100176，China) |
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Abstract In order to evaluate the influence of horizontal freezing tunnel construction on the adjacent orthogonal subgrade more reasonably，considering the non-uniform frost heave of soil and regarding the subgrade structure as an elastic Euler Bernoulli continuous beam， a coupling calculation equation for evaluating the effect of horizontal freezing tunnel construction on the adjacent orthogonal subgrade was deduced based on deformation coordination conditions，random medium theory and superposition principle. The reliability of the random medium prediction method was verified by an engineering example，and the accuracy of the coupling method was shown by comparing the measured values with the calculation results of the coupling method and the two-stage method. Finally，numerical simulation was carried out based on ABAQUS software，and the results show that the coupling method and ABAQUS simulation results are in good agreement with each other. It is also shown that the uplift displacement at the same location of the subgrade increases gradually as the frozen wall expands，and that the lower the temperature of the refrigerant medium or the shallower the tunnel depth，the larger the uplift deformation of the subgrade. The frozen pipes in silty clay layers have the greatest impact on the uplift deformation of the subgrade. The improved calculation method in this paper can provide some theoretical guidance for the protection measures to reduce the influence of horizontal freezing tunnel construction on subgrade.
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2020, Vol. 39 
