Model tests on wrap-faced geosynthetic reinforced soil wall with sandy soil backfills and its deformation patterns

• Main Authors: Zong-Han Li, 李宗翰
• Other Authors: Po-Kai Wu
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/59283130452016519838

碩士 === 國立雲林科技大學 === 營建工程系碩士班 === 100 === In this study, a series of model tests on wrap-faced geogrid-reinforced soil (GRS) retaining wall with sandy soil backfill was performed. Three types of geogrids having different nominal strengths were adopted. The dimensions of the model wall were 250 cm (width) × 80 cm (depth) × 112 cm (height). A footing of 30 cm wide was located on the surface of backfill to resist the applied vertical load during model test. The effect of setback distance of footing on the ultimate load of GRS wall is also experimentally evaluated. The lateral deformation of facing and the vertical displacement of footing are measured. Besides, a photogrammetric analysis procedure was used to distinguish the deformed pattern of marked grid on the membrane and to define the thickness of shear zone. The above results indicate that the ultimate load of reinforced one is increased largely than that of unreinforced case. For the reinforced soil, compared to the effect of setback distance of footing, the geogrid embedded length of pullout strength has more significant effect on the ultimate footing load. On the other hand, the effect of stiffness of geogrid on the ultimate footing load is less important for currently adopted reinforcements. For reinforced soil with the shortest embedded length of geogrid, a pullout failure and tensile rupture failure were both found. The stiffness of geogrid also has significant effect on the observed reinforcement tensile rupture failure.