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Abstract The pullout behavior of geogrid in red clay is studied. An experimental investigation is conducted using geogrid in eight groups of red clays with different water contents. The results indicate that the geogrid embedded in red clay mainly represents pullout failure，and the ultimate pullout force is sensitive to water content. It decreases with the increase of the water content firstly. Then it tends to be constant around the plastic limit. Moreover，the ultimate pullout force is independent of the normal load in this zone. The distribution character of geogrid strains proves that the decrease of the ultimate pullout force is due to the reduction of the friction resistance between soil and geogrid. Besides，the water content influences the process of the pullout behavior. The increase of water content leads to the ultimate pullout force soon after the geogrid strain increases linearly.
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Received: 07 August 2008
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