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| Mechanism of Geogrid Reinforced Soil at Bridge Approach |
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2009-08-28
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Using Geogrid-Reinforced Soil (GRS) we studied the working mechanism and design method of GRS at bridge approach with high backfi ll by fi eld experiment. In a highway section where the height of backfi ll is 13.5 meters, geogrids were used at two bridge approaches to address the bumping problems. Some soil pressure cells were used to measure the normal and lateral soil pressure at different locations in the roadbed. The experimental results indicate that geogrids in geogrid-reinforced soil (GRS) could produce an uplift force, the closer the location to the abutment, the larger the uplift force, and the reduction of measured soil pressures compared with theoretical values was the largest at the bottom of roadbed, less at the top than at the bottom, and the least in the mid-height of roadbed than at the bottom. These fi ndings are different from those of the traditional greogrid-reinforced subgrade design method.
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Copyright
© 2005-2008, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences
Xiaohongshan, Wuchang, Wuhan 430071, P. R. China
E-mail: irsm@whrsm.ac.cn |
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