Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experimental Study on Temperature-time Characteristics of Loess under the Freeze-Thaw Cycles
The loess in northern Shaanxi is situated in the seasonal frozen region, where the soil water phase transition is predominantly caused by freeze-thaw cycles. Engineering practices have evidenced that the transformation of water from soil causes considerable damage to structures, roadways, slopes, canals, and other infrastructure. The temperature-time characteristics of loess, particularly freezing point, serve as a crucial indicator for assessing the freeze-thaw state of soil. To investigate the influence of water content w and the number of freeze-thaw cycles N on temperature-time behaviours, the temperature-time curves of loess with diverse water content were depicted through freeze-thaw cycle tests. The alterations in freeze-thaw characteristics such as freezing point, freezing time, supercooling phenomenon, thawing time, and thawing point were analysed. The findings indicated that: 1) The phenomenon of supercooling was significantly affected by w and N. When w = 9 % and 13 %, the supercooling phenomenon gradually became significant as N increment. Conversely, when w = 17 %, the supercooling phenomenon became less significant as N increment. The decline curves of various w were essentially identical in the supercooling stage, and the cooling rate decreased as w increased during continual freezing stage. 2) The freezing point of loess gradually decreased as N increment. Freezing time did not exhibit significant variations in relation to N, however, a higher water content led to a longer freezing duration. All soil samples attained a stable freezing temperature within 12 hours. 3) The thawing point of soil samples remained constant at 0 ℃ under varying N, however, the stability levels of all curves at zero degrees varied. Except for N = 3, all other cases exhibited a gradual increment after 12 hours, which might be attributed to the instability of the thawing temperature during the experiment. 4) During the rapid ascent stage of the thawing curve, the ascending rate slightly increased with the increase of N. In the slow rise stage, the rising rate was relatively rapid during N ≤ 3, the rate of increase experienced a sudden drop at N = 10, and then proceeded at a relatively slower. The change pattern of the thawing curve remained consistent across various w, with only a certain extent of influence on the rate of change. The results might provide theoretical support for the engineering design, construction, and maintenance of the seasonal frozen soil area in northern Shaanxi Province and other regions with comparable weather conditions.
Experimental Study on Temperature-time Characteristics of Loess under the Freeze-Thaw Cycles
The loess in northern Shaanxi is situated in the seasonal frozen region, where the soil water phase transition is predominantly caused by freeze-thaw cycles. Engineering practices have evidenced that the transformation of water from soil causes considerable damage to structures, roadways, slopes, canals, and other infrastructure. The temperature-time characteristics of loess, particularly freezing point, serve as a crucial indicator for assessing the freeze-thaw state of soil. To investigate the influence of water content w and the number of freeze-thaw cycles N on temperature-time behaviours, the temperature-time curves of loess with diverse water content were depicted through freeze-thaw cycle tests. The alterations in freeze-thaw characteristics such as freezing point, freezing time, supercooling phenomenon, thawing time, and thawing point were analysed. The findings indicated that: 1) The phenomenon of supercooling was significantly affected by w and N. When w = 9 % and 13 %, the supercooling phenomenon gradually became significant as N increment. Conversely, when w = 17 %, the supercooling phenomenon became less significant as N increment. The decline curves of various w were essentially identical in the supercooling stage, and the cooling rate decreased as w increased during continual freezing stage. 2) The freezing point of loess gradually decreased as N increment. Freezing time did not exhibit significant variations in relation to N, however, a higher water content led to a longer freezing duration. All soil samples attained a stable freezing temperature within 12 hours. 3) The thawing point of soil samples remained constant at 0 ℃ under varying N, however, the stability levels of all curves at zero degrees varied. Except for N = 3, all other cases exhibited a gradual increment after 12 hours, which might be attributed to the instability of the thawing temperature during the experiment. 4) During the rapid ascent stage of the thawing curve, the ascending rate slightly increased with the increase of N. In the slow rise stage, the rising rate was relatively rapid during N ≤ 3, the rate of increase experienced a sudden drop at N = 10, and then proceeded at a relatively slower. The change pattern of the thawing curve remained consistent across various w, with only a certain extent of influence on the rate of change. The results might provide theoretical support for the engineering design, construction, and maintenance of the seasonal frozen soil area in northern Shaanxi Province and other regions with comparable weather conditions.
Experimental Study on Temperature-time Characteristics of Loess under the Freeze-Thaw Cycles
Cao Xueye (Autor:in) / Zhang Eryuan (Autor:in) / Bai Xiaopeng (Autor:in) / Ji Jiaqiang (Autor:in) / Sun Jielong (Autor:in)
2025
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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