Comparative Experimental Investigation of Geogrid-soil Interface Behavior of Biaxial and Triaxial Geogrid
Laboratory direct shear test and pullout test were conducted focusing on biaxial geogrid (SS20) and triaxial geogrid（TX160） to investigate the deformation and geogrid-soil interface behavior. The displacements of geogrid specimens were recorded at 4 sections in the pullout test. The development of geogrid-soil interface shear stress, geogrid deformation, shear dilatancy/shrinkage behavior and interface parameters were analyzed, and the effect of test methods on the testing results was also investigated. The results show that the interaction between the geogrid and soil of TX160 concentrates at the vicinity of pullout end. However, this interaction is well developed along the full length of SS20 specimens. Meanwhile, this interaction of TX160 can be better enhanced with the increase of vertical stress compared with that of SS20. Both the peak and residual friction angles of SS20 case are greater than that of TX160 case, while the cohesion is just opposite. The vertical stress has obvious effect on the geogrid-soil interface strength parameters obtained from both the direct shear test and pullout test. Thus, the vertical stress adopted in the test should be determined based on the actual stress status of the geogrid for engineering application.
Keywords: geogrid, geogrid-soil interface behavior, direct shear test, pullout testing, geogrid-soil interface parameters
YANG G Q, LI G X, ZHANG B J. Experimental studies on interface friction characteristics of geogrids [J]. Chinese Journal of Geoteshnical Engineering, 2006, 28 (8): 948—952 (In Chinese)
DONG Y L,HAN J, BAI X H. Numerical analysis of tensile behavior of geogrid with rectangular and triangular apertures[J]. Geotextiles and Geomembranes, 2011, 29 (2):83—91.
QIAN Y, HAN J, PODHAREL S K,et al. Performance of triangular aperture geogrid–reinforced base courses over weak subgrade under cyclic loading [J]. Journal of Materials in Civil Engineering, 2013, 25 (8):1013—1021.
CHEN C, MCDOBELL G R, THOM N H. Discrete element modeling of cyclic loads of geogrid –reinforsed ballast under confined and unconfined conditions [J]. Geotextiles and Geomembranes, 2012, 35:76—86.
MA S D. Testing study on soil interface characteristics of geosynthetics [J]. Journal of Yangtze River Scientific Research Institute, 2004, 21 (1): 11—14 (In Chinese)
TEIXEIRA S H C, BUENO B S, ZORNBERG J G. Pullout resistance of individual longitudinal and transverse geogrid ribs [J]. Journal of Geotechnical and Geoenvironmental Engineering, 2007, 133 (1):37—50.
SHI D D, LIU B B,SHUI B H, et al. Comparative experimental studies of interface characteristics between uniaxial/biaxial plastic geogrids and different soils[J]. Roch and Soil Mechanics,2009,30 (8):2237—2244(. In Chinese)
ZHENG J J, CAO B s, ZHOU Y J, et al. Pull –out test study of interface behavior between triaxial geogrid and soil [J]. Rosch and Soil Mechanics,2017, 38 (2) :317—324 (In Chinese)
ZHOU F, ZHOU Z M, DU Y X. Experimental study on influence of compaction degree on vertical deformation of reinforced soil[J]. Journal of Huan University (Natural Sciences), 2017, 44 (5): 73— 79(. In Chinese)
XU L R. Research on selection of measuring method of interface parameters between reinforcements and soils [J]. Roch and Soil Mechanics, 2003, 24 (3):458—462 (In Chinese)
Editorial Board of the Handbook about Application of Geosynthetics in Engineering. The handbook about application of geosynclines in engineering [M]. 2nd ed.Beijing:China Architecture and Building Press, 2000 :95—100 (In Chinese)
BAO C G. The principle and application of geosynthetics in engineering[M]. Beijing: China Bater & Power Press, 2008 :142— 147 (In Chinese)
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