摘要
本文提出了一种具有通风降温、支挡锚固和减胀减震功能的新型框架通风锚杆冻土边坡支护结构,并阐述其工作机理。基于传热学和自然对流理论,建立新型框架通风锚杆与土体换热的计算模型,对其降温效果进行了分析;基于Winkler理论,建立冻胀和融沉阶段新型框架通风锚杆与土体相互作用的力学简化计算模型,分析冻胀和融化阶段新型框架通风锚杆受力性能。结合算例,采用提出的简化计算方法分析了新型框架通风锚杆支护多年冻土边坡的热学和力学效应,并通过模型试验与理论计算对比,对所提出理论计算方法的合理性进行验证。结果表明:①新型框架通风锚杆能够充分发挥冷季吸收冷量冻结土体、暖季屏蔽热量保护冻土的作用,并逐年抬升冻融交界面;②新型框架通风锚杆支护结构支护效果良好,能够减弱土体冻胀作用,提高多年冻土边坡的稳定性;③所提出简化计算方法以期为新型框架通风锚杆支护多年冻土边坡提供理论依据。
A new type of framework ventilation anchor rod support structure for frozen soil slopes with functions of ventilation and cooling,support anchoring,and expansion reduction and shock absorption was proposed,and its working mechanism was explained.Based on the heat transfer and natural convection theory,the calculation model of heat transfer between new frame ventilation anchor and soil is established,the cooling effect is analyzed.Based on the Winkler theory,the simplified mechanical calculation models of the interaction between the new frame ventilation anchor and soil during frost heaving and thawing settlement are es-tablished respectively.The mechanical properties of the new frame ventilation bolt during frost heaving and thawing are analyzed.The thermal and mechanical effects of a new type of frame ventilation bolt supporting permafrost slope are numerically analyzed by using the sim-plified calculation method.The rationality of the proposed theoretical calculation method is verified by comparing the theoretical results with those of the model test.The research results show that,(1)The new frame ventilation anchor can make full use of the cold ab-sorption capacity to freeze soil in cold season and can shield heat to protect frozen soil in warm season,although the interface of freezing and thawing is raised year by year.(2)The new frame ventilation bolt support structure can reduce the frost heaving effect of soil and improve the stability of permafrost slope.(3)The proposed simplified calculation method can provide theoretical basis for the application of the new frame ventilation bolt supporting permafrost slope.
作者
董建华
师利君
吴晓磊
Dong Jianhua;Shi Lijun;Wu Xiaolei(Key Laboratory of Disaster Prevention and Mitigation in Cimil Engineering of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China;Western Engineering Research Center of Disaster Mitigation in Cinil Engineering of Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2024年第7期90-105,共16页
China Civil Engineering Journal
基金
国家自然科学基金项目(52178335、51778275)
中央引导地方科技发展资金项目(YDZX20216200001739)
甘肃省基础研究创新群体项目(20JR10RA205)
陇原青年创新创业人才(团队项目)(2020RCXM120)
甘肃省知识产权局高价值专利培育和转化项目(20ZSCQ034)
兰州市十大科技创新项目(2020-2-11)。
关键词
多年冻土边坡
新型框架通风锚杆
自然对流
协同工作
融沉固结
permafrost slope
new frame ventilation anchor
natural convection
cooperative work
thawing settlement consolidation
