首页|变暖背景下砾石换填对多年冻土区机场跑道下地温场的影响

变暖背景下砾石换填对多年冻土区机场跑道下地温场的影响

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  • 国家科技期刊平台
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受气候变暖影响，东北北部地区冻融灾害频发，对寒区工程设施造成了重要影响。地基温度场的研究是分析与解决工程基础冻融灾害的重要手段。文中我们以漠河机场跑道为对象，通过有限单元法研究了洁净砾石换填对机场道基温度场的影响，并对运行30 年内道基温度场进行预测。结果表明，换填使季节最大冻结深度(MSF)增加，且换填对道基下MSF的水平影响范围在道面中心线两侧30 m左右。之后，通过比较不同换填深度(1。5(顶)～3。5(底)、1。5～4。5、1。5～5。5和1。5～6。5 m)的道基温度场变化，发现:换填底部深度达到4。5 m时，MSF变化的速率开始减小。最后，根据IPCC 第六次评估报告(AR6)未来100年间不同气候变暖速率模型模拟研究了无换填与不同换填深度下的MSF可能变化。结果发现，到2100年，在SSP2-4。5情景下，未换填及不同换填深度的道基下MSF分别为1。63、1。86、1。84、1。84和1。84 m。因此，利用换填法来减少跑道冻融灾害时换填深度应至少达到 4。5 m。同时，应加强漠河机场道基地表水与该跑道区地下水的防排水设施建设与维运。研究结果有助于进一步认识换填对多年冻土和活动层水热状态的影响，可为解决道基冻胀和融沉问题提供重要科学依据。
Influences of gravel refilling on temperature fields of runway foundation soils in permafrost regions under a warming climate:a case study of the Mohe airport,northern Heilongjiang province,Northeast China
Under a warming climate,frost hazards have become increasingly more frequent in permafrost regions in North of Northeast China.In the studies of engineering design,construction and operation/maintenance in permafrost regions,research on the ground temperature fields of engineered foundations is key to analyzing and solving problems due to frost hazards.In this paper,the finite element method was used to investigate the impacts of refilling of clean gravels on the ground temperature fields of runway foundation soils,and to predict the temperature fields of the foundation soils under the runway over a 30-year period of runway operation.The results indicate that the gravel refilling of runway foundation soils can significantly increase the maximum-depth of seasonal frost-penetration(MSF).The horizontal thermal influence of the refilling on the MSF of the foundation would extend laterally to about 30 m at each side.Then,by comparing the changes in ground temperature fields of the foundation structures with different refilling depths(1.5(top of the refill)to 3.5,4.5,5.5 and 6.5(bottom)m),it is found that the rate of change in MSF would gradually decrease when the bottom of refilling depth reaches 4.5 m.Finally,by simulating the values of MSF under no-refilling and different filling depths for different climate warming rates over the next 100 years as indicated by the Sixth Assessment Report(AR6)of the Intergovernmental Panel on Climate Change(IPCC),it is found that by 2100,the MSF under the SSP2-4.5 scenario would be 1.63,1.86,1.84,1.84 and 1.84 m,respectively.Therefore,when using the refilling of clean gravels to mitigate frost hazards of runway foundation soils,the refilling bottom depth should be no smaller than 4.5 m.At the same time,the well-managed construction and good maintenance of drainage and/or barrier facilities for surface and subsurface waters near the runway should be considered in cases of abnormally rainy and/or snowy summers and falls.This study is helpful to understand the influences of gravel refilling on the thermal state of permafrost foundation soils,and can provide an important scientific basis for solving the problems of frost heave and thaw settlement of runway foundation soils in permafrost areas.

PermafrostAirport runwayGround temperatureMaximum-depth of seasonal frost-penetration(MSF)Numerical model simulation

王娇娇、张虎、金晓颖、黄帅、王宏伟、王文辉、詹涛、周刚义、车富强、李艳、李新宇、何瑞霞、张泽、张圣嵘、李国玉、童长江、王逊、金会军

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东北林业大学土木与交通学院冻土研究所/教育部东北冻土地质系统与环境观测试验研究站,哈尔滨 150040

黑龙江省自然资源调查院大兴安岭漠河冻土与寒区环境野外科学观测研究站(自然资源部),哈尔滨 150036

中国科学院西北生态环境资源研究院冻土工程国家重点实验室,兰州 730000

中国科学院西北生态环境资源研究院甘肃遥感重点实验室和黑河遥感试验研究站,兰州 730000

国家林业和草原局重点国有林区森林资源监测中心,加格达奇 165100

哈尔滨工业大学土木工程学院,哈尔滨 150090

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多年冻土 机场跑道 地温 季节最大冻结深度(MSF) 数值模拟

国家自然科学基金国家自然科学基金东北林业大学成栋领军人才启动项目科技部基础资源调查专项黑龙江省自然资源调查院大兴安岭漠河冻土与寒区环境野外科学观测研究站(国土资源部)自主课题

42271130U20A2082LJ2020-012022FY100703

2024

10.12006/j.issn.1673-1719.2023.216

气候变化研究进展
国家气候中心

气候变化研究进展

CSTPCD北大核心
影响因子：1.711
ISSN：1673-1719
年,卷(期)：2024.20(3)