Changes in Interface Stresses During Pullout Tests on Geogrid Strip Reinforcement

Abstract

For a strip geogrid reinforcement, pullout resistance per unit width is known to increase with decreasing specimen width at low applied normal stresses. This phenomenon can be explained by a conceptualized model for a pullout interaction mechanism consisting of combined 2-D and 3-D interaction mechanisms, and the results obtained from laboratory pullout tests can be extended to the field. In this paper, a series of pullout tests on stiff extruded geogrid specimens embedded in dense sandy gravel was carried out and the normal stresses at the soil-reinforcement interface were measured by small-diameter earth pressure cells. On the basis of these tests, the fundamental behavior of soil-geogrid reinforcement interaction is explained and the conceptualized pullout interaction model is corroborated. It is shown that restrained positive dilatancy, observed at low applied normal stresses, results in an increase in actual normal stresses at the soil-reinforcement interface at the edges of the geogrid, thereby increasing the pullout resistance of the reinforcement.

Study on the Treatment and Settlement Monitoring Technology of Passenger Dedicated Line Collapsible Loess Foundation

“…3. One of the settlement monitoring purposes is predicating the final settlement by the monitoring data [4,5] . The major predication method of more experienced is hyperbolic curve method and settlement rate method.…”

Comparison of One-Way Shearing Test between Coarse-Grained Soils and Reinforced Earth

“…He found that the strength improved several times when there existed fiber materials in the earth. At present, there have many reports about the interface mechanics characteristics of the coarse-grained soils [2][3][4], but the reports about these characteristics of reinforced earth under one-way shearing force are less [5][6], not to mention the dynamic characteristics. In this paper, we have taken the one-way shearing test of coarse-graine soils and reinforced earth.…”