›› 2009, Vol. 30 ›› Issue (4): 965-970.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental research on interface friction of geogrids and soil

LIU Wen-bai1，ZHOU Jian2   

  1. 1. Department of Ocean Environment & Engoneering Traffic, Shanghai Maritime University, Shanghai 200135, China; 2. Department of Geotechnical Engineering of Tongji University, Shanghai 200092, China
  • Received:2007-04-24 Online:2009-04-10 Published:2011-01-30

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Abstract:

Indexes of interface friction between geogrids and soil are key of design of geosynthetic reinforced soil. The analysis of soil-geogrids interface friction and the direct shear friction tests and pullout friction tests have been carries out for interface friction characteristic of two tests. In the direct shear friction tests and pullout friction tests, shear strength tested interface angle of friction φsq and interface cohesion csq on composite soil of geogrids reinforced soil; the relative displacements of geogrids and soil are not same, their strength mechanism are distinguishable. Direct shear friction test and pullout friction test are to be each applications; shear displacements of shear stress peak value on pullout friction tests are about five to ten times greater than the shear displacements of shear stress peak value on direct friction tests. The relative displacements of geogrids and soil are little, direct shear friction test can be applied; and the relative displacements are large, pullout friction test can be applied. Normal stress is increase, shear stress pear strength and its shear displacements of direct shear friction tests and pullout friction tests are increase. Shear strain rate is little, shear stress peak value is large, and its shear displacement is large too; shear strain rate is increase, shear stress peak value and its shear displacement is lower, the reasons are dissipation of pore water pressure of soil-geogrids interface and stress relaxation of geogrids. To each projection, there are correct choose direct shear friction test and pullout friction test to determine design parameters.

Key words: geogrids, soil, interface friction, direct shear friction test, pullout friction test

CLC Number: 

  • TU 411
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