冻融循环对原状过湿土固结变形特性的影响

doi:10.7522/j.issn.1000-0240.2019.0031

摘要/Abstract

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。

关键词: 冻融循环, 过湿土, 固结变形, 渗透性

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.

Key words: freezing-thawing cycles, over-wet soil, consolidation deformation, permeability

中图分类号:

P642.14

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.

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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