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Title: Dilatancy and strength of an unsaturated soil-cement interface in direct shear tests
Authors: Hossain, MA
Yin, JH 
Keywords: Direct shear
Completely decomposed granite
Cement grout
Matric suction
Net normal stress
Issue Date: 2015
Publisher: American Society of Civil Engineers
Source: International journal of geomechanics, 2015, v. 15, no. 5, 04014081, p. 1-10 How to cite?
Journal: International journal of geomechanics 
Abstract: The dilatancy of a soil is significantly influenced by matric suction, and it affects the apparent friction angle and shear strength of the soil. To examine the influence of dilatancy on interface behavior, a series of direct shear box tests are conducted on a compacted completely decomposed granite (CDG) soil–grout interface in a cast in situ condition under different matric suctions and net normal stresses. The test results indicate that matric suction and net normal stress have significant influence on the hardening-softening and dilatancy of the soil–cement grout interface. The failure envelopes for different matric suctions are observed as linear. The apparent interface friction angle and adhesion intercept increase with matric suction. The suction envelope is found to be nonlinear as the δbδb-angle decreases with matric suction. A modified model is proposed to consider the influence of dilatancy on the apparent interface friction angle and hence on the interface shear strength. Experimental shear strength data are compared with the analytical shear strength results obtained from the modified model using effective interface strength parameters and analytical values of dilation angles obtained from dilatancy curves. The experimental shear strength data agrees well with the analytical results for different net normal stresses and matric suctions.
ISSN: 1532-3641
EISSN: 1943-5622
DOI: 10.1061/(ASCE)GM.1943-5622.0000428
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