干湿交替作用（alternation of drying and wetting） 土壤具有湿胀干缩的性能。当土壤由湿变干 时，土壤各部分胶体脱水程度和速度不同，干缩的程度不一致，就会沿粘结力薄弱的地方裂...
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在干湿交替作用下，微液滴的扩展与腐蚀电流之间相互影响、相互促进。
Under cyclic wet-dry conditions, it showed a closed relation between the spreading of micro-droplets and corrosion current. They were influenced and promoted with each other.
认为土壤胀缩运动主要决定于土壤粘粒的含量，同时季节性冻融作用与干湿交替作用是导致土壤胀缩运动的直接因素。
Moreover, seasonal freezing and melting and seasonal drying and wetting are the direct factors causing soil to expand and contract.
渗流作用可以影响土体强度，红粘土在干湿交替作用后出现了裂缝，裂缝的发育增强了渗流作用对土体强度的影响程度。
Seepage action can influence the intensity of soil, and the development of cracks that come forth under the dry-wet alternate action reinforces force of seepage action.
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