Centrifugal model test and numerical simulation of vertical earth pressure on soft foundation box culvert  

作　　者：张军辉 姚永胜 郑健龙 张涛 

机构地区：[1]National Engineering Laboratory of Highway Maintenance Technology (Changsha University of Science and Technology) [2]Texas Transportation Institute, Texas A&M University System, College Station [3]Hunan Province Highway Administration Bureau

出　　处：《Journal of Central South University》2015年第9期3556-3563,共8页中南大学学报（英文版）

基　　金：Project(2012AA112504) supported by the National High Technology Research and Development Program of China;Projects(51108048,51478054) supported by the National Natural Science Foundation of China

摘　　要：To obtain the vertical earth pressure on a soft foundation box culvert and investigate the interaction of the soil-culvert-foundation system, both a centrifugal model test and a numerical simulation were conducted and the comparisons with the current methods to determine the load on a culvert were completed. The results of the model test and numerical analysis are in satisfactory agreement, which shows that the direction of the shear stress between the culvert and the adjacent embankment depends on the differential settlement between them. A vertical earth pressure concentration appears on the culvert with a rigid piles foundation because of a downward shear stress. The ratio of the load on a soft foundation culvert and the overburden pressure above the culvert raises first and then decreases as the backfill height increases. In order to reduce the load on a culvert, it is suggested to limit the stiffness difference of the foundations under the culvert and embankment and to use a light backfill over the culvert.To obtain the vertical earth pressure on a soft foundation box culvert and investigate the interaction of the soil-culvert-foundation system, both a centrifugal model test and a numerical simulation were conducted and the comparisons with the current methods to determine the load on a culvert were completed. The results of the model test and numerical analysis are in satisfactory agreement, which shows that the direction of the shear stress between the culvert and the adjacent embankment depends on the differential settlement between them. A vertical earth pressure concentration appears on the culvert with a rigid piles foundation because of a downward shear stress. The ratio of the load on a soft foundation culvert and the overburden pressure above the culvert raises first and then decreases as the backfill height increases. In order to reduce the load on a culvert, it is suggested to limit the stiffness difference of the foundations under the culvert and embankment and to use a light backfill over the culvert.

关 键 词：box culvert vertical earth pressure soft foundation centrifugal model test 

分 类 号：TU43[建筑科学—岩土工程]