新型框架通风锚杆支护多年冻土边坡降温效果及力学效应试验研究
Experimental study on cooling and mechanical effects of new frame ventilation anchor bolt supporting permafrost slope
摘要
Abstract
The new frame ventilated anchor is an independently developed flexible support structure for frozen soil slope,which has a broad application prospect.In order to explore the cooling effect and mechanical effect of the new frame ventilation anchor,a multifunctional frozen soil laboratory box was designed,and it has the functions of loading,changing angle,adapting to the shaking table,and can simultaneously measure the temperature,moisture,wind speed and internal force.And a permafrost model slope reinforced by the frame ventilation bolts was erected to investigate the variation laws of temperature,moisture,wind speed and internal force of frame ventilation bolts subjected to freeze-thaw cycles.The closer to the anchor bolts,the more obvious the change of soil temperature and moisture.The frame ventilation anchor can absorb the cold energy and transmit and diffuse it along the axial and radial direction,with good cooling effect and maintaining the frozen state of frozen soil slope.The wind speed change law in the anchor bolt is consistent with the change of the external wind speed.A large external wind speed can motivate a more remarkable cooling effect of the frame ventilation anchor bolt.In a freeze-thaw cycle,the axial force of the anchor bolt changes in a parabola,and the axial force in the freezing period is greater than that in the thawing period.And the internal force of frame in freezing period is 2-3 times that in thawing period.The results can provide guidance for the design and engineering application of the new frame ventilation anchor.关键词
多年冻土边坡/新型框架通风锚杆/降温效果/模型试验Key words
permafrost slope/new frame ventilation anchor/cooling effect/model test分类
土木建筑引用本文复制引用
董建华,师利君,吴晓磊,王璐..新型框架通风锚杆支护多年冻土边坡降温效果及力学效应试验研究[J].岩土力学,2023,44(11):3141-3150,10.基金项目
国家自然科学基金项目(No.52178335,No.51778275) （No.52178335,No.51778275）
中央引导地方科技发展资金项目(No.YDZX20216200001739) （No.YDZX20216200001739）
甘肃省基础研究创新群体项目(No.20JR10RA205) （No.20JR10RA205）
陇原青年创新创业人才(团队项目)(No.2020RCXM120) （团队项目）
甘肃省知识产权局高价值专利培育和转化项目(No.20ZSCQ034) （No.20ZSCQ034）
兰州市十大科技创新项目(No.2020-2-11).This work was supported by the National Natural Science Foundation of China(52178335,51778275),the Central Government Guides Local Science and Technology Development Fund Projects(YDZX20216200001739),the Gansu Basic Research Innovation Group Project(20JR10RA205),the Longyuan Youth Innovation and Entrepreneurship Talent(Team Project)(2020RCXM120),the High Value Patent Cultivation and Transformation Project of Gansu Intellectual Property Office(20ZSCQ034)and the Ten Science and Technology Innovation Projects in Lanzhou City(2020-2-11). （No.2020-2-11）
