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冻融循环作用下黄土的物理力学特性研究综述
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Abstract:
我国分布着众多的黄土，尤其西北和华北部分地区大面积存在。这些区城又属于季节性冻土区，区域内的路基、边坡等与黄土密切相关的岩土工程不可避免地受到干湿–冻融循环的劣化作用，产生复杂变形。情况严重时会诱发诸如不均匀沉降、边坡失稳等工程病害，严重威胁相关工程的安全性和稳定性，亟需对干湿–冻融循环作用下压实黄土的变形特性开展全面研究。针对黄土在经历冻融循环后的土体强度问题，本文归纳总结了冻融循环对黄土微结构以及力学性质和参数产生的影响、改性黄土提高土体强度等的研究进展。
There are numerous loess in China, especially in the northwest and north parts of large area, these areas also belong to seasonal frozen regions, and the soil engineering closely related to loess, such as area of subgrade and slope, is inevitable subject to the deterioration of under dry-wet-freeze-thaw cycle, resulting in complex deformation. If the situation is serious, it will induce serious engineering diseases, such as uneven settlement and slope instability. It is a serious threat to the safety and stability of related projects, and it is urgent to carry out a comprehensive study on the deformation characteristics of compacted loess under the action of dry-wet-freeze-thaw cycle. In this paper, aiming at the soil strength problem of loess after freeze-thaw cycle, the influence of freeze-thaw cycle on loess microstructure, mechanical properties and parameters was summarized, and the research progress of modified loess to improve soil strength was summarized.
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