采暖场景下大跨度建筑基础周围冻土上限演化  

Evolution of permafrost upper limit around long-span structural foundation in permafrost region under heating scenario

作　　者：贾海锋 杨晓明 Jia Haifeng;Yang Xaioming(Northwest Research Institute Co.,Ltd.of China Railway Engineering Corporation,Lanzhou 730000,China)

机构地区：[1]中铁西北科学研究院有限公司,甘肃兰州730000

出　　处：《山西建筑》2022年第14期77-80,共4页Shanxi Architecture

基　　金：中国中铁新疆区域工程建设指挥部科技研发项目(2019003)。

摘　　要：基于有限元理论构建数值仿真模型,研究了高原多年冻土区室内采暖场景下大跨度建筑物基础周围的冻土上限演化规律。结果表明:建筑物周围的冻土上限呈漏斗状分布,且随着时间的推移漏斗的范围逐渐扩展;与室内无采暖场景相比,室内采暖时的漏斗范围明显偏大;随着时间的推移,建筑物基础周围的冻土上限最大值呈递增趋势,但采暖场景下的最大冻土上限较未采暖时明显偏大;采暖温度越高,建筑物周围的多年冻土上限越低;对沉降敏感的大跨度结构应采取对应的措施减小或消除其冻土上限变化对建筑物的影响。Based on the finite element theory,a numerical simulation model was established to study the evolution of frozen soil upper limit around long-span building foundations in indoor heating scenario in plateau permafrost region. The results show that the upper limit of frozen soil around buildings is funnel-shaped,and the funnel-shaped range expands gradually over time.Compared with the scene without indoor heating,the funnel range for indoor heating is obviously larger. The maximum permafrost limit around the building foundation increases over time,but the maximum permafrost limit under heating is obviously larger than that without heating. The higher the heating temperature,the greater the permafrost upper limit around the building.For long-span structures sensitive to settlement,corresponding measures should be taken to reduce or eliminate the influence of permafrost upper limit change on buildings.

关 键 词：大跨度结构:采暖 冻土上限 

分 类 号：TU445[建筑科学—岩土工程]