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Abstract The mechanical behaviors of interface between coarse-grained soil and concrete were investigated by simple shear tests with both bentonite slurry and mixed soil slurry(bentonite mixed with cement grout). In addition，the mechanical behaviors of interface were analyzed with different slurries. The results show that the relation curves between shear stress and shear strain exist strain softening，and strain hardening appears with bentonite slurry or without slurry，when mixed soil slurry exists；and the position of peak strength is mainly related to normal stress and cement content. The more the cement content is，the larger the strength becomes. The value of friction angle with 40 percent cement grouts is 3.2 times higher than that with 10 percent cement grouts，the strength accounts for 84 percent of the interface strength without slurry. The shear displacement increases with increasing normal stress and cement content at the same height in shear failure state. Shear dilatation is significant when the surface without slurry in small normal stress state，while shear contraction is significant with the bentonite slurry and the mixted soil slurry. Compared the sample with height of 100 mm to that with height of 30 mm，the errors of friction angle and horizontal displacement are about 3% and 6%，respectively，when the maximum grain size is 20 mm，which shows that the height of sample affects the strength and deformation to some extent. In addition，the friction angle reduces by 4.8%，i.e. 1.9°，compared to the maximum grain size of 60 mm.
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Received: 06 April 2010
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2010, Vol. 29 
