有压与无压烧结雪无侧限抗压强度对比试验研究  

Unconfined Compressive Strength Comparative Experimental Research of Sintered Snow with and Without Pressure

作　　者：霍海峰 杨雅静 孙涛 樊戎 蔡靖[1] 胡彪 HUO Haifeng;YANG Yajing;SUN Tao;FAN Rong;CAI Jing;HU Biao(School of Transportation Science and Engineering,Civil Aviation University of China,Tianjin 300300,China;Ministry of Transport Airport Engineering Safety and Long Term Performance Research Base,Tianjin 300300,China;Army Logistics Academy of PLA,Chongqing 401331,China;China People’s Liberation Army National Defence University,Beijing 100091,China)

机构地区：[1]中国民航大学交通科学与工程学院,天津300300 [2]交通部机场工程安全与长期性能科研基地,天津300300 [3]中国人民解放军陆军勤务学院,重庆401331 [4]中国人民解放军国防大学,北京100091

出　　处：《材料导报》2024年第5期40-45,共6页Materials Reports

基　　金：中央高校基金(3122020040);天津市交通运输委员会面上项目(2019-18)。

摘　　要：雪层烧结是全球高纬度寒区雪跑道建造的重要环节,是指雪颗粒间胶结强度随时间不断增长的过程。为确定压实雪层烧结时间设计值,并深入对比有压烧结和无压烧结雪层烧结强度变化规律,自主研发加压设备进行无侧限抗压强度试验。研究表明,无侧限压缩应力-应变曲线呈现有峰值强度和无峰值强度两种形式,有峰值的情况更易发生在高压和长烧结时间下。有压烧结时雪颗粒不断受到挤压,促进雪融化成水,有利于冰的形成,故雪的密度随烧结时间延长先快后慢不断增长,而无压烧结时密度基本不发生变化,进而造成有压烧结雪样的强度和弹性模量均大于无压烧结雪样。无压烧结15 d后雪的强度增长显著放缓,故雪跑道建设过程中,在烧结温度为-10℃左右,建议取15 d作为压实雪层烧结时间设计值。研究成果可用来指导雪跑道建造中雪层强度指标和变形指标的确定。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.

关 键 词：高纬度寒区 压实雪层 烧结 抗压强度 弹性模量 

分 类 号：TU5[建筑科学—建筑技术科学]