| 季冻土区临水内、外拱护墙结构冻胀特征分析及治理 |
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| 引用本文： | 孙洪伟,翟利杰,任望忠,傅汝进.季冻土区临水内、外拱护墙结构冻胀特征分析及治理[J].吉林大学学报(地球科学版),2020,50(6):1833-1843. |
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| 作者姓名： | 孙洪伟 翟利杰 任望忠 傅汝进 |
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| 作者单位： | 1. 长春工程学院土木工程学院, 长春 130012;2. 长春市新立城水库管理局, 长春 130119 |
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| 基金项目： | 吉林省科技发展计划资助项目（20180201046SF） |
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| 摘 要： | 为厘清季冻土区临水内、外拱护墙结构冻胀平位移冻害机理，测试隔离层防冻害装置的有效性，在20101110-20110531、20131110-20140531、20171110-20180531三个观测年内，以长春某湖泊临水内、外拱护墙结构为研究对象，选择内、外拱护墙结构和设隔离层防冻害装置的试验内拱护墙结构三者相对比，用钢尺量距法观测三者寒期的平位移状态。结果表明：内拱护墙结构出现倾斜、裂缝导致的内向冻胀平位移冻害，其内向平位移曲线随气温均呈"半驼峰型"，对应观测年持续降温-持续低温-持续升温-正温时段，内向冻胀平位移呈减小-增大-减小-稳定残余的位移运动，诱因是平冻胀应力的生成-增长-减弱-消失作用；外拱护墙结构出现较小的外向冻胀平位移，外向冻胀平位移曲线均呈"波浪型"，无冻害发生，冰凸拱平冻胀应力推动外拱护墙结构压缩冻土凹拱形成外向冻胀平位移，冻土凹拱限制了外向冻胀平位移发展；设隔离层防冻害装置的试验内拱护墙结构未发生平位移冻害，其内向冻胀平位移较自然冻胀的内拱护墙结构减小83.92%，较外拱护墙结构减小51.74%，表明隔离层防冻害装置防治冻胀平位移冻害有效。
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| 关 键 词： | 内拱护墙结构 外拱护墙结构 平冻胀应力 冻胀平位移 隔离层防冻害装置 |
| 收稿时间： | 2020-02-24 |
Frost Heaving Feature Analysis and Treatment of Inner and Outer Waterfront Arch Parapet Structures in Seasonal Frozen Soil Regions |
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| Sun Hongwei,Zhai Lijie,Ren Wangzhong,Fu Rujin.Frost Heaving Feature Analysis and Treatment of Inner and Outer Waterfront Arch Parapet Structures in Seasonal Frozen Soil Regions[J].Journal of Jilin Unviersity:Earth Science Edition,2020,50(6):1833-1843. |
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| Authors: | Sun Hongwei Zhai Lijie Ren Wangzhong Fu Rujin |
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| Institution: | 1. Shool of Civil Engineering, Changchun Institute of Technology, Changchun 130012, China;2. Changchun Xinlicheng Reservoir Authority, Changchun 130119, China |
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| Abstract: | In order to clarify the frost damage mechanism of horizontal frost heaving displacement to the inner and outer waterfront arch parapet in the seasonal frozen soil regions, and test the effectiveness of the anti-freezing device with isolation layer, some inner and outer structures in Changchun were taken as the research objects. In comparison with the three arch parapet structures including inner, outer, and experimental inner with isolation layer anti-freezing devices, the horizontal displacement states were observed and measured by steel rule in the three observation years (20101110-20110531, 20131110-20140531, 20171110-20180531) in cold periods. It turned out that there were inward horizontal frost heaving displacement frost damages, such as, tilt and crack in the inner structure. All the inward horizontal displacement curves developed a "half hump" trend according to the temperature;Corresponding to the continuous cooling-continuous low temperature-continuous heating-positive temperature period in the observation year, the inward horizontal frost heaving deformation showed the residual displacement movement of decreasing-increasing-decreasing-stabilizing caused by generating-growing-weakening-disappearing of the horizontal frost heaving stress. There was minor outward displacement to the outer structure, and all the curves of such a displacement showed wavy without any occurrence of frost damages. The horizontal frost heaving stress of the ice convex arch pushed the outer arch structure to compress the frozen soil concave arch to form the outward horizontal frost heaving displacement, which restricted its development. There was no horizontal displacement frost damages in the experimental inner arch structure. The inner horizontal frost heaving displacement is 83.92% less than that of the natural inner structure and 51.74% less than that of the outer structure. This result demonstrates that the anti-freezing device with isolation layer can prevent the horizontal displacement frost damage effectively. |
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| Keywords: | inner arch parapet structure outer arch parapet structure horizontal frost heaving stress horizontal frost heaving displacement anti-freezing device with isolation layer |
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