摘要
为研究新疆高山多年冻土区路基结构适用性,对G219新藏公路沿线病害进行调查统计,在试验路段K595+070-K596+270修筑4种路基结构并埋设传感器以监测温度、水分和沉降变形,利用模糊数学综合评价法定量分析各路基结构的评价等级和适用性。结果表明:G219沿线多年冻土区公路病害以沉陷、裂缝为主,占比49.03%、27.53%;相比普通路基,热棒路基、片块石路基、通风管路基分别将填料内(地基中)冻土上限提高了4.3 m(1.9 m)、3.5 m(1.2 m)、2.8 m(0.3 m),将地下1 m处沉降值减小了33.5%、14.2%、24.1%,各路基水分场分布规律相似;热棒路基、通风管路基、片块石路基、普通路基的评价指数为0.77、0.71、0.68、0.54,结合评价集可知前三者具有保护高山多年冻土稳定性的作用,路基结构实践适用性依次递减。
In order to study the applicability of different subgrade structures in the alpine permafrost area of Xinjiang,the potential hazard at highway G219 were analyzed based on the field investigations.Four kinds of subgrade structures were built in the test section K595+070-K596+270 and sensors were buried to monitor temperature,moisture and sedimentation deformation,the evaluation grade and applicability of each subgrade by fuzzy mathematics comprehensive evaluation method are calculated and analyzed.The results show that the highway G219 hazard in the permafrost area are mainly subsidence and cracks,accounting for 49.03%and 27.53%.Compared with the ordinary subgrade,the thermosyphon subgrade,the block-stone subgrade and the ventilation duct subgrade raises separately the permafrost upper limit in the filler(in the foundation)by 4.3m(1.9 m),3.5 m(1.2 m),2.8 m(0.3 m),and the settlement value at 1 meter underground is reduced by 33.5%,14.2%,24.1%separately,and the distribution of the moisture field of each subgrade is similar.The evaluation index of thermosyphon subgrade,ventilation duct subgrade,block-stone subgrade and ordinary subgrade are 0.77,0.71,0.68,0.54,the top three subgrades have the effect of protecting the stability of alpine permafrost based on the evaluation set,and the practical applicability of subgrade structures decreases sequentially.
作者
王铁权
王莉云
WANG Tiequan;WANG Liyun(Shaanxi Railway Institute,Weinan 714025,China;Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang'an University,Xi'an 710064,China;Henan Provincial Institute of Communications Planning Survey&Design Institute,Zhengzhou 450000,China)
出处
《甘肃科学学报》
2023年第2期124-130,共7页
Journal of Gansu Sciences
基金
渭南市科技计划项目(2020ZDYF-JCYJ-227)
陕西铁路工程职业技术学院2019年科研基金项目计划(KY2019-01)。
关键词
路基结构
高山多年冻土
传感器监测
模糊数学综合评价
Subgrade structure
Alpine permafrost
Sensor monitoring
Fuzzy mathematics comprehensive evaluation
