|
|
|
| Research on the Mechanical Characteristics of Double-deck Geogrids of Pile Net Structure of Low Embankment under Dynamic Load |
| WEI Ping，WEI Jing，YANG Song-lin，ZHANG Dong，MA Ying-li |
| (1.Beijing Jiaotong University, Beijing 100044， China; 2.Beijing Polytechnic College, Beijing 100042， China) |
|
|
|
|
Abstract Abstract：Research purposes： The dynamic analysis model software was built to investigate characters of double-deck geogrids within pile net structure in low embankment under train dynamic load. Both of the interaction mechanism among dynamic load, double-deck geogrids, pile and soil, and the force or deformation law of double-deck geogrids were studied. Research conclusions： Under train dynamic load, for the longitudinal section geogrid, pull stress of the substratum geogrid is higher than of the superstratum. For the transvers section geogrid, pull stress of the superstratum geogrid is higher than of the substratum and led to a very small difference value from subgrade center to slope toe. Tensioned membrane effect, the total pull stress and the reduction of single geogrids stress were all be better for the double-deck than for the single one. Double-deck geogrids can reduce the incremental value of geogrids pull stress and led to stucture stable.It will provide method of working mechanism for geogrids of railway roadbed structure in this research.
|
|
Received: 05 April 2017
|
|
|
|
|
|
|
2017, Vol. 34 
