| 季冻土区临水轻台结构冻拔特征分析及防治 |
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| 引用本文： | 孙洪伟,傅汝进.季冻土区临水轻台结构冻拔特征分析及防治[J].吉林大学学报(地球科学版),2019,49(5):1405-1414. |
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| 作者姓名： | 孙洪伟 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： | 为探索季冻土区临水轻台结构冻拔冻害破坏机理，测试套筒防冻拔冻害技术的有效性，以长春某临水轻台群为研究对象，选择基土自然冻胀轻台结构与装有套筒防冻拔冻害装置的试验轻台结构相对比，用精密水准仪观测二者的寒期竖向位移动态。结果表明：基土自然冻胀轻台结构出现了冻拔位移冻害，各观测年冻拔位移曲线随气温均呈"半驼峰型"姿态发展，对应观测年的持续降温-持续低温-持续升温-正温时段，冻拔位移呈下降-上升-下降-稳定的变化特征；冻土的冻拔力推动轻台桩上拔引发冻拔位移冻害。观测装有套筒防冻拔冻害装置的试验轻台结构发现，其竖向位移长期在±5 mm的小位移区间平位波动，比自然冻拔轻台结构的平均冻拔位移减小了98%，表明套筒装置隔离了冻拔力对轻台结构的冻拔作用，冻拔位移冻害被有效遏制。勘验装有套筒防冻拔冻害装置的试验轻台结构，未发生"错动""台板拉裂"等典型冻拔位移冻害，印证了套筒防冻害装置对防治轻台结构冻拔位移冻害有实效。
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| 关 键 词： | 季冻土区 临水轻台结构 冻拔位移冻害 冻拔位移曲线 冻拔力 套筒防冻拔冻害装置 |
| 收稿时间： | 2018-11-05 |
Feature Analysis and Control of Frost Heave to WaterfrontLight Platform Structure in Seasonal Frozen Soil Region |
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| Sun Hongwei,Fu Rujin.Feature Analysis and Control of Frost Heave to WaterfrontLight Platform Structure in Seasonal Frozen Soil Region[J].Journal of Jilin Unviersity:Earth Science Edition,2019,49(5):1405-1414. |
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| Authors: | Sun Hongwei Fu Rujin |
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| Institution: | 1. School 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 explore the damage mechanism of frost heave and freeze damage to waterfront light platform structure in seasonally frozen soil regions, and to test the effectiveness of the methods for controlling frost heave and freeze damage of the sleeve, a light platform group in Changchun was taken as the research object. Both vertical displacements of the natural frozen-swelling light platform structure and the light-platform structure equipped with anti-freeze and freeze-frozen sleeve device were observed in cold season by precise leveling instrument, and the foundations of the two were compared. It turned out that there was freeze damage to the foundation of the natural frost heave in the structure, and the frost heave curve demonstrated a "half hump shape" because of the temperature of the observation year. The displacement curve of frost heave showed the characteristics of decreasing-rising-decreasing-stable corresponding to continuous cooling, continuous low temperature, continuous heating in the positive temperature period of the observation year. The uplift of light platform pile was pulled by frost heave force, which caused damage. The vertical displacement of the structure with anti-freezing sleeve device was stable for a long time within a small displacement interval of±5mm, and the average displacement of the structure reduced by 98% compared with that of the natural frost heave in observation. The results showed that the device effectively isolated the effect of frost heave force on the structure; thus the displacement and damage were effectively controlled. During the inspection of the structure with anti-freezing-damage sleeve device, no typical freezing damage of frost heave displacement occurred, such as "misplacement" or "platen cracking", which confirms that the structure equipped with anti-freeze sleeve device is effective for controlling displacement freeze damage. |
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| Keywords: | seasonal frozen soil regions waterfront light platform structure freeze damage of frost heave displacement frost heave displacement curve frost heave force anti-freezing-damage sleeve device |
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