Published Online: 14 May 2009
Page Count: 7
El Mohtar, Chadi S.
Assistant Professor, Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Texas at Austin, Austin, TX
Khire, Milind V.
Professional EngineerAssociate Professor, Dept. of Civil and Environmental Engineering, Michigan State Univ., E. Lansing, MI
(Received 25 November 2007; accepted 13 April 2009)
This paper presents a vertical pullout test (VPT) developed to measure the peak interface friction angle (δ) and adhesion (a) between soil and planar geosynthetic products. The key advantages of this test are (1) relatively low capital cost for the equipment, (2) relatively simple compared to the conventional methods, (3) the setup can be relatively easily adapted by small conventional soil testing laboratories, and (4) the setup can be transported to the field for field measurement for relatively quick preliminary evaluation of soils. The testing method was evaluated by comparing the δ and a obtained from the VPT to (1) those parameters measured using a conventional soil direct shear apparatus modified to also measure interface friction between planar geomembranes and soil according to
Paper ID: GTJ101593