指肥料养分等有机和无机物质随雨水、渗透水或上升水从土层中流出的这一现象。这些物质中以盐分最易受影响，所以有时使用脱盐作用和脱碱作用这些术语。
本文着重阐述了软弱夹层的物质组成、结构特性及其在长期渗水作用下的化学溶失作用和变化趋势。
This paper mainly describes the mineral composition, structural behaviour of the weak seam in dam foundation, and its chemically solvent action and variation under long term infiltration of water .
风化前锋是一个重要的地球化学作用场所，在这一狭窄的界面上，伴随碳酸盐矿物的快速淋失，残余酸不溶物开始了明显分解。
The weathering front is a main place of geochemical reaction, and at this limited-thick interface, with quick dissolution of carbonates, acid-insoluble residues begin to obviously decompose.
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