It is a truth that laying thermal insulation layer is an effective way to prevent and control heat damage in high ground temperature tunnel. The understanding of heat damage prevention and control mechanism of high geothermal tunnel can be improved by studying the temperature evolution of lining structure in the process of temperature field change of tunnel surrounding rock. In this paper, numerical simulation and model test are used to study the temperature evolution characteristics of surrounding rock and tunnel structure at different positions in the process of heating and cooling surrounding rock. The accuracy of the numerical analysis model of the temperature evolution characteristics of the surrounding rock and tunnel structure in the process of temperature change is verified, and the evolution characteristics of the cooling performance of the thermal insulation layer in the process of temperature change are revealed. The results show that during the overburden heating process, the overburden and liner temperature exhibit three phases of mixed increase, slow increase, and stable evolution with time. While during the cooling process of the surrounding rock, the temperature of the surrounding rock and the lining structure shows a three-stage evolution characteristic of a slow decrease, a non-linear decrease, and a stability with time. The process of changing the temperature of the surrounding rock does not affect the cooling range of the thermal insulation layer, but only changes the temperature changing pattern of the surrounding rock structure.
Zhou Junwei
. Temperature Evolution Characteristics of Tunnel Lining Structure in the Process of Rock Temperature Variation[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S2)
: 749
-756
.
DOI: 10.20174/j.JUSE.2024.S2.27
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