Journal
INTERNATIONAL JOURNAL OF GEOMECHANICS
Volume 22, Issue 8, Pages -Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)GM.1943-5622.0002466
Keywords
Temperature field; Frost heave force; Isothermal ring; Orthogonal test; Sensitivity analysis
Categories
Funding
- Natural Science Foundation of Shandong Province [ZR2016JL018]
- research and innovation team project of the college of civil engineering and architecture, Shandong University of science and technology, China [2019TJKYTD02]
- Project of Shandong Province Higher Educational Young Innovative Talent Introduction and Cultivation Team (Disaster prevention and control team of underground engineering involved in the sea)
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Accurately calculating the frost heave force is crucial for the frost resistance design of tunnels in cold regions. A computational model is used to analyze the mechanical parameters and their influence on the frost heave force. Based on case analysis, the stress and deformation solution for surrounding rock in cold region tunnels is obtained. The results provide insights into the design and simulation of tunnels in cold regions.
It is very important to accurately calculate the frost heave force for the frost resistance design of tunnels in cold regions. A computational model will divide the lining and surrounding rock into eight parts, such as the support zone, the frozen zone (e.g., isothermal Rings I, II, III, IV, V, and VI), and the unfrozen surrounding rock Zone VII. The model will consider the influence of the inhomogeneity of the mechanical parameters of the frozen surrounding rocks that are caused by the temperature field on the calculation results for the frost heave force. Based on the case analysis, the elastoplastic analytical solution of the stress and deformation of the surrounding rock in a cold region tunnel will be obtained. The results show that: (1) if the basic physical and mechanical parameters of the frozen surrounding rock are taken as constants, the calculation results of frost heave force, plastic radius (r(p)), and circumferential stress (sigma(theta)) at the excavation radius will be smaller than that of the model proposed in this paper, and the freezing resistance design of the tunnel lining in cold regions based on the uniform parameter model might lead to lining damage due to insufficient support strength in the later stage; (2) the results of variance analysis show that the inner radius of the lining (r(a)) and radius of Zone 7 (r(7)) had a significant effect on the frost heave force in all cases, and the elastic modulus of the lining (E-0) was significant. The influence of the elastic modulus of Zone 7 (E-7) and in situ stress (p(0)) on the frost heaving force was not significant; and (3) the influence law of the displacement release coefficient (eta), E-0, and p(0) on the force that acted on the lining will be analyzed. The model to calculate the frost heave force and the related conclusions could have guiding significance for the frost resistance design and numerical simulation of tunnels in cold regions. (C) 2022 American Society of Civil Engineers.
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