Study on stress influential factors of geogrids of geosynthetic reinforcement layer in pile net subgrade structure under train load
WEI Ping
WEI Jing
XIAO Hong
ZHANG Dong
Abstract：The influential factors of geogrid tension such as pile spacing,subgrade height,soil modulus of pile tip and geosynthetic reinforcement layer modulus under dynamic train load are studied based on the dynamic finite element model of pile net subgrage structure.The results show that the longitudinal geogrid tension increases with the increase of pile spacing.Besides,pile spacing has little effect on the geogrid tension in soil between piles when it reaches 2m or more,but it has great effect on the geogrid tension in the pile-top and at the edge.The value of geogrids tension is proportional to that of subgrade height.The value of geogrids tension decreases with the increase of soil modulus of pile tip,and the effect of the latter could be neglec-ted when it reaches 100 MPa,which is little affected by the change of geosynthetic reinforcement layer modulus.The geogrid tension increment increases with the increase of subgrade height,but decreases with the increase of soil modulus of pile tip.For the geogrids distributed from the center to the edge of subgrade section,the effect of the above four influential factors to the geo-grid tension have the same variation regularities,however,such effect become weaker at the road shoulder compared to the subgrade center,and the weakest at the slope toe.
Keywords：train loadpile net structuresubgradegeogridstress analysis
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 77-83 )