›› 2014, Vol. 35 ›› Issue (S2): 75-84.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of constitutive model of sand-geogrid interface behavior in geogrid/geotextile reinforced soil

WANG Jun1, 2，LIN Xu3，FU Hong-tao1, 2   

  1. 1. College of Architecture and Civil Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China; 2. Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation of Zhejiang Province Wenzhou University, Wenzhou, Zhejiang 325035, China; 3. College of Architecture and Engineering, Lianyungang Technical College, Lianyungang, Jiangsu 222006, China
  • Received:2014-01-08 Online:2014-10-31 Published:2014-11-12

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Abstract: Experiments were conducted in a large-scale direct shear apparatus to study the mechanical behavior at the sand-geogrid (S-GG) and sand-geotextile (S-GT) interface. The results show that a certain relationship exists between peak/residual shear strength and shear dilatancy of interface. That is, peak shear stress will occur at a stage when relative shear compression finishes, while residual shear stress will occur when relative shear dilatancy finishes. The shear stress obvious reduction with increasing shear displacement is known to be caused by geosynthetics polishing, folding and rupture, which should not be neglected in interface behavior studying. Thus, a combined constitutive model has been presented for predicting sand-geogrid interface behavior. The model is composed of four relationships: (1) The peak/residual shear strength envelope. (2) A hyperbolic relationship model of shear behavior in pre-peak region. (3) A displacement-softening model for post-peak region. (4) Modeling for shear dilatancy of sand-geogrid interface. The predictions made by the proposed model are found to be in good agreement with the results of direct shear tests, so as to prove that the model is reasonable.

Key words: sand-geogrid interface, constitutive model, pre-peak, post-peak, shear dilatancy

CLC Number: 

  • TU 443
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