Calculation and test of geogrid strain in pile-supported reinforced embankment(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年03期
- Page:
- 64-71
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Calculation and test of geogrid strain in pile-supported reinforced embankment
- Author(s):
- CHEN Yong-hui; CHEN Geng; QI Chang-guang; XU Kai
- (1. Key Laboratory of Geotechnical and Embankment Engineering of the Ministry of Education, Hohai University, Nanjing 210098, Jiangsu, China; 2. Research Institute of Geotechnical Engineering, Hohai University, Nanjing 21098, Jiangsu, China; 3. Nanjing Hydraulic Research Institute, Nanjing 210029, Jiangsu, China)
- Keywords:
- geotechnical engineering; pile-supported reinforced embankment; modified EBGEO standard; field test; geogrid strain; equivalent pile diameter coefficient
- PACS:
- TU473.1
- DOI:
- -
- Abstract:
- In order to improve the calculation method of geogrid strain in pile-supported reinforced embankment, this paper based on the German standard EBGEO, considered the effect of cap and the stiffness of geogrid on the calculation of geogrid strain and proposed the modified calculation method with consideration of equivalent pile diameter. Based on field experiment of pile-supported embankment, the embankment settlement, pile-soil stress and the rule of the geogrid-strain variation were monitored and recorded, and the measured results were compared with the calculated results. The results show that types of geogrid have no significant effect on embankment settlement. Pile-soil load transformation is further strengthened with the increase of modulus of geogrid. There are differences in the transformation mode of the embankment load. Strain of steel-plastic geogrid increases with the increase of the height of embankment in the filling period, what’s more, creep is observed. The strain changes of wire geogrid during the filling period are not obvious, but strain mutation appears after that. By comparing the field experiment results with the theoretical results, the rationalization of the equivalent pile diameter coefficient method used to calculate the geogrid strain is verified. It is suggested that the modified EBGEO method with consideration of the equivalent pile diameter coefficient can be adopted for geogrid strain and stress analysis when the high-strength stiff geogrids such as steel geogrids are used.
Last Update: 2016-06-12