| 冻融循环对原状过湿土固结变形特性的影响 |
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| 引用本文： | 程培峰,王佳康.冻融循环对原状过湿土固结变形特性的影响[J].冰川冻土,2019,41(4):858-864. |
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| 作者姓名： | 程培峰 王佳康 |
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| 作者单位： | 东北林业大学 土木工程学院, 黑龙江 哈尔滨 150040 |
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| 基金项目： | 黑龙江省交通运输厅重点项目（43216011）资助 |
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| 摘 要： | 为了研究季冻区过湿土的固结变形特性，对黑大公路青冈段路基原状过湿土进行固结试验和渗透试验，研究了冻融循环作用下原状过湿土的固结变形特性。试验结果表明：原状过湿土的含水率越高，土体的压缩性越高；初始孔隙比越大，渗透性越高。冻融循环后，过湿土产生不规则裂缝，土的结构也发生改变，土的压缩系数有所增大，随着冻融循环次数的增加，压缩性先增大后趋于平缓。冻融后过湿土的竖向渗透系数明显增大，且随着冻融循环次数的增加渗透性呈现先增大后趋于平缓的规律，而横向渗透系数冻融前后无明显差异。
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| 关 键 词： | 冻融循环 过湿土 固结变形 渗透性 |
| 收稿时间： | 2018-02-12 |
| 修稿时间： | 2018-08-18 |
Effect of freezing-thawing cycles on consolidation deformation characteristics of natural over-wet soil |
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| CHENG Peifeng,WANG Jiakang.Effect of freezing-thawing cycles on consolidation deformation characteristics of natural over-wet soil[J].Journal of Glaciology and Geocryology,2019,41(4):858-864. |
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| Authors: | CHENG Peifeng WANG Jiakang |
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| Institution: | College of Civil Engineering, Northeast Forestry University, Harbin 150040, China |
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| Abstract: | In order to study the consolidation and deformation characteristics of over-wet soil in seasonal frozen areas, a consolidation test and a permeability test were carried out by using the natural soil sampled from a wet soil roadbed of the the highway from Lanxi to Qinggang in Heilongjiang Province. The effect of the freezing-thawing cycles on the consolidation and deformation characteristics of the over-wet soil was studied emphatically. The results show that the higher the moisture content of the undisturbed soil, the lower the compressibility of the soil; the higher the initial porosity ratio, the higher the permeability. After freezing-thawing cycles, soil specimen produces irregular cracks, along with soil structure changing and compression coefficient increasing. With increase of freezing-thawing cycles, compression increases gradually and then gently. After freezing-thawing cycles, the vertical permeability coefficient of the wet soil obviously increases. With increase of freezing-thawing cycles, the permeability increases gradually and then gently. There is no obvious difference of the transverse permeability coefficient before and after freezing-thawing. |
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| Keywords: | freezing-thawing cycles over-wet soil consolidation deformation permeability |
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