Abstract: With the high development of society, municipal sludge production increased year by year. It has important significance for
improving the urban ecological environment and economic sustainable development to efficiently dispose this kind of municipal sludge.
Sludge usually has high moisture content, More importantly, it has a very high fraction of organic and fine particles with the high
viscosity, and it is not only low efficient to reduce the total volume through mechanical dehydration but has a low strength of the sludge
after dehydration, which is easy to cause the landfill pile skid, instability and other accidents. Fiber-reinforcement is a newly developed
soil improvement technology. in order to study the effect of fiber reinforcement on sludge sheer strength properties, a series of shear
strength tests were conducted on sludge with different fiber contents (0, 0.05, 0.1, 0.2, 0.4 and 0.8%) under different consolidation
pressure （50, 100, 200 and 400 kPa） . The effect of fiber addition on the moisture content, dry density and shear strength under
different consolidation pressure were analyzed. The results showed that under different consolidation pressure, the water content of the
sludge decreased firstly and then increased with the increase of the fiber content after the consolidation, while the dry density change
trend is opposite, and the experimental determination of the optimal dosage of fiber content is 0.1%. The shear strength of sludge is
increased with the increase of the content of the fiber after consolidation, fiber reinforcement effect on sludge are very effective in the
shear strength, and the reinforcement effect is the most significant under the 100 kPa. The strain hardening tendency is more
 significant with the increase of fiber content in the late shear failure process

Key words: sludge, fiber reinforcement, moisture content, dry density, shear strength