Simplified dynamic calculation model and shaking table test verification of thermal anchor pipe-permafrost system

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2024-04-10 DOI:10.1016/j.coldregions.2024.104203

Xiaolei Wu , Jianhua Dong , Pengfei He , Shilin Su , Lu Wang

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引用次数: 0

Abstract

To study the seismic response of permafrost slopes supported by the thermal anchor pipe during different freeze-thaw periods, the simplified dynamic calculation model of the thermal anchor pipe permafrost system is established, considering the characteristics of freeze-thaw stratification of permafrost, the additional mass effect of the thawed soil layer, the fluid-solid interaction between the cooling liquid and pipe wall, as well as the interaction between the anchorage section and the frozen soil. The results indicate that seasonal differences in both the amplitude and waveform of the axial force response of the thermal anchor pipe during different freeze-thaw periods. The dynamic axial force increment in thawing period is greater than that in freezing period, but the total axial force is greater in freezing period, and it should be designed to prevent it from generating excessive anchor tension and breaking under the combined action of frost heaven and earthquake. Additionally, the axial force response of the adiabatic section and evaporator section is greater than that of the anchoring section. The proposed theoretical model for thermal anchor pipe is reasonable and the results can provide useful guidance for the seismic design of the new structure.

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热锚管-冻土系统的简化动态计算模型和振动台试验验证

为研究不同冻融期热力锚杆管支护冻土边坡的地震响应，考虑冻土冻融分层特征、解冻土层的附加质量效应、冷却液与管壁之间的流固相互作用以及锚固段与冻土之间的相互作用，建立了热力锚杆管冻土系统的简化动力计算模型。结果表明，在不同的冻融期，热锚管轴向力响应的振幅和波形都存在季节性差异。解冻期的动态轴力增量大于冻结期的动态轴力增量，但冻结期的总轴力更大，设计时应防止其在霜天和地震的共同作用下产生过大的锚固拉力而断裂。此外，绝热段和蒸发器段的轴力响应大于锚固段。所提出的热力锚固管理论模型是合理的，其结果可为新结构的抗震设计提供有益的指导。

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来源期刊

Cold Regions Science and Technology 工程技术-地球科学综合

CiteScore

7.40

自引率

12.20%

发文量

209

审稿时长

4.9 months

期刊介绍： Cold Regions Science and Technology is an international journal dealing with the science and technical problems of cold environments in both the polar regions and more temperate locations. It includes fundamental aspects of cryospheric sciences which have applications for cold regions problems as well as engineering topics which relate to the cryosphere. Emphasis is given to applied science with broad coverage of the physical and mechanical aspects of ice (including glaciers and sea ice), snow and snow avalanches, ice-water systems, ice-bonded soils and permafrost. Relevant aspects of Earth science, materials science, offshore and river ice engineering are also of primary interest. These include icing of ships and structures as well as trafficability in cold environments. Technological advances for cold regions in research, development, and engineering practice are relevant to the journal. Theoretical papers must include a detailed discussion of the potential application of the theory to address cold regions problems. The journal serves a wide range of specialists, providing a medium for interdisciplinary communication and a convenient source of reference.