Physical Model Test and Heat Transfer Analysis on Backfilling Construction of Qinghai-Tibet Transmission Line Tower Foundation

Jun Zhang, Chenglin Zhou, Ze Zhang, Andrey Melnikov, Doudou Jin and Shengrong Zhang
Additional contact information
Jun Zhang: School of Civil Engineering, Institute of Cold Regions Science and Engineering, Northeast-China Observatory and Research-Station of Permafrost Geo-Environment of the Ministry of Education, Northeast Forestry University, Harbin 150040, China
Chenglin Zhou: Northwest Institute of Eco-Environment and Resources, China Academy of Sciences, Lanzhou 730000, China
Ze Zhang: School of Civil Engineering, Institute of Cold Regions Science and Engineering, Northeast-China Observatory and Research-Station of Permafrost Geo-Environment of the Ministry of Education, Northeast Forestry University, Harbin 150040, China
Andrey Melnikov: Melnikov Permafrost Institute, Siberian Branch, Russian Academy of Science, 677010 Yakutsk, Russia
Doudou Jin: School of Civil Engineering, Institute of Cold Regions Science and Engineering, Northeast-China Observatory and Research-Station of Permafrost Geo-Environment of the Ministry of Education, Northeast Forestry University, Harbin 150040, China
Shengrong Zhang: School of Civil Engineering, Institute of Cold Regions Science and Engineering, Northeast-China Observatory and Research-Station of Permafrost Geo-Environment of the Ministry of Education, Northeast Forestry University, Harbin 150040, China

Energies, 2022, vol. 15, issue 7, 1-15

Abstract: The cone-cylindrical pile foundation is a kind of shallow buried foundation, which needs to be open excavated and backfilled during construction. The density of the backfill is closely related to the refreezing process of the backfill. However, there is still a lack of relevant research on the relationship between backfill density and the refreezing process of backfill. The method of model experiment is selected to study the refreezing process of backfill under three backfill soil densities. The controlled density of backfill is 1.83, 1.62 and 1.36 g/cm 3 , and the times of freeze–thaw cycle is 14, 22 and 39, respectively. The main research findings are as follows: First, the effect of the initial temperature of the backfill on the refreezing is mainly reflected in the first three freeze–thaw cycles; the second is that the higher the density of the backfill, the faster the backfill responds to changes in outside air temperature, and the shorter the freezing time; third, the pile foundation is a good conductor of heat, which will cause the soil temperature change on the pile side to be significantly greater than that of the natural soil, and the temperature change of the pile foundation surface is greater than that of the backfill. The research results can provide a reference for the backfill construction of pile foundations in cold regions and the selection of boundary conditions for related numerical simulations.

Keywords: refreezing process; foundation backfill; freeze–thaw cycles; permafrost region (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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