Influence of Pile and Geogrid on Bearing Capacity of Highway Embankment Foundation

YAN Shu-wang, CHENG Dong-dong, HOU Jin-fang, YANG Chang-min

China Journal of Highway and Transport ›› 2008, Vol. 21 ›› Issue (4) : 30-36.

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China Journal of Highway and Transport ›› 2008, Vol. 21 ›› Issue (4) : 30-36.

Influence of Pile and Geogrid on Bearing Capacity of Highway Embankment Foundation

  • YAN Shu-wang1, CHENG Dong-dong1, HOU Jin-fang1, YANG Chang-min2
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Abstract

In order to study effect of geogrid and pile on a new highway soft soil foundation reinforcement, the plane strain elasto-plasticity finite element method was used to calculate the ultimate bearing capacity of the foundation. Two-dimensional finite element model of the geogrid-reinforced and pile-supported foundation of the embankment was built. The effect of the geogrid on top of the piles to improve the soft soil foundation wasanalyzed. With the unchangeable rate of replacement, the influences of different pile diameters and distances between piles on bearing capacity and stability of the foundation were studied. Then, improving laws of bearing capacity of composite foundation were studied with increase of the rate of replacement. In order to reduce the total settlement of embankment and improve the non-uniform settlement, effects of two measures of reducing piles distance under the roadbed and the embankment slope were calculated. The finite element analysis result shows that the non-uniform settlement of highway foundation can be controlled effectively by geogrid and pile, especially for the soft soil foundation. Reducing the distance of the piles under road surface can improve the non-uniform settlement and reduce the embankment settlement.

Key words

road engineering / highway embankment / elasto-plasticity finite element method / ultimate bearing capacity / geogrid / rate of replacement

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YAN Shu-wang, CHENG Dong-dong, HOU Jin-fang, YANG Chang-min. Influence of Pile and Geogrid on Bearing Capacity of Highway Embankment Foundation[J]. China Journal of Highway and Transport, 2008, 21(4): 30-36

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