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 .

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。

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The WMF also called for immediate action to combat water infiltration and structural deterioration at the cathedral church of St Michael in Coventry, England.

BBC: An increase of urban areas on watch