Unconfined Compressive Strength Comparative Experimental Research of Sintered Snow with and Without Pressure
HUO Haifeng1,2, YANG Yajing1, SUN Tao3,*, FAN Rong4, CAI Jing1, HU Biao1
1 School of Transportation Science and Engineering, Civil Aviation University of China, Tianjin 300300, China 2 Ministry of Transport Airport Engineering Safety and Long Term Performance Research Base, Tianjin 300300, China 3 Army Logistics Academy of PLA, Chongqing 401331, China 4 China People's Liberation Army National Defence University, Beijing 100091, China
Abstract: Snow sintering is an important step in the construction of snow runways in high latitude cold regions around the world, which refers to the process of increasing strength of snow over time. In order to explore the strength change law of naturally deposited snow (sinter with pressure) and compacted snow layer (sinter without pressure), the sintered snow samples were studied by using self-developed pressurized equipment for unconfined compressive strength test. It was found that the unconfined compressive stress-strain curves presented both peak and no-peak strength forms, and the case with peak was more likely to occur under high pressure and long sintering time. The density of pressurized sintered snow samples grows with sintering time and shows the characteristics of fast and then slow, while the density of unpressurized sintering basically does not change. The strength and elastic modulus of pressurized sintered snow samples are greater than that of unpressurized sintering, and the growth rate of both are also greater than that of unpressurized. During the construction of snow runways, it is recommended to take 15 d as the design sintering time for compacted snow layers, and the unpressurized sintered snow strength slows down significantly after 15 d at sintering temperatures of around -10 ℃. The research results have excellent guidance for the determination of snow layer strength index and deformation index in the construction of snow runways.
霍海峰, 杨雅静, 孙涛, 樊戎, 蔡靖, 胡彪. 有压与无压烧结雪无侧限抗压强度对比试验研究[J]. 材料导报, 2024, 38(5): 23060124-6.
HUO Haifeng, YANG Yajing, SUN Tao, FAN Rong, CAI Jing, HU Biao. Unconfined Compressive Strength Comparative Experimental Research of Sintered Snow with and Without Pressure. Materials Reports, 2024, 38(5): 23060124-6.
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2024, Vol. 38 
