Abstract
A pile foundation in a permafrost region is in a negative-temperature environment, so concrete is affected by the negative temperature of the surrounding soil. It not only affects the formation of concrete strength but also leads to engineering quality accidents in serious cases. With the support of the two permafrost bridge projects of the national highway from Beijing to Mohe in the Greater Khingan Mountains region, a systematic remote dynamic monitoring method for ground temperature in ice-rich tundra is proposed. Based on the actual measurement of temperature at different strata depths and the comprehensive consideration of surface temperature, terrestrial heat flux and other parameters, the ground temperature profile evolution in relation to depth in Greater Khingan was established. The theoretical ground temperature profile curve is similar to the measured profile. The results show that the variation trends of ground temperatures in relation to the strata depth at different monitoring sites is similar, and all show seasonal variation: From June to November, the ground temperature at different depths tends to be constant. From December to May, the ground temperature at any depth within the range of 0 to 5.5 m follows the curve of the cosine function. Below 5.5 m, the earth temperature no longer varies with depth. The research results can be used as reference for pile foundation construction in a negative-temperature environment in ice-rich tundra.
Highlights
The Greater and Lesser Khingan Mountains in northeast China belong to degraded perennial island tundra with an area of about 214,600 km2
From the perspective of environmental resource protection, it is of great significance to study the variation of ground temperature in relation to the strata depth in perennial island tundra, so as to predict the degradation of the permafrost environment and take timely protection measures [4,5]
The variation of the ground temperature in relation to the strata depth in the permafrost region can be applied to the negative-temperature environment of pile foundation to ensure the engineering quality by selecting an appropriate construction period [9], designing anti-freeze concrete [10,11] and using an insulating layer [10,12,13,14,15]
Summary
The Greater and Lesser Khingan Mountains in northeast China belong to degraded perennial island tundra with an area of about 214,600 km. It is necessary to establish a simple calculation model applicable to ice-rich tundra, based on a comprehensive consideration of the ground temperature variation in relation to time and the stratum depth. This approach is more convenient and effective in obtaining the variation of surface and shallow ground temperatures. Based on the continuous monitoring of the ground temperature in the ice-rich tundra of the Greater Hinggan region for one year, this paper reveals the variation of the ground temperature with time and depth, and establishes a ground temperature prediction model for this area, in order to provide a reference for pile foundation construction
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