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淤泥土物理性质：一是含有很多细颗粒及大量有机腐植质；二是颜色深灰色或暗绿色，有臭味；三是一般天然含水量在40%～70%之间，有的大于70%，孔隙比>1.0，天然容量在15～18kn/m3---之间。力学性质：强度极低，压缩性大，透水性差。工程特性：地基承载力低，强度增长缓慢，加荷后易变形且不均匀，变形速率大且稳定时间长