The laboratory consolidation tests were perofrmed to investigate the compression characteristics of the dewatered sludge as a construction mateiral. The sludge is dredged from the bottom of a lake. After the dehydration, it is broken into fragments. The fragments shows different compression behavior from that of ordinary undisturbed clay. The remarkable point in our research is: The eapproxlog p curves of fragments have two kinds of compression index in the normally consolidation region. The first compression index has linear relation with initial water content, while the second one is almost constant.
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