Centrifugal model test and numerical simulation of vertical earth pressure on soft foundation box culvert
来源期刊：中南大学学报(英文版)2015年第9期
论文作者：ZHANG Jun-hui YAO Yong-sheng ZHENG Jian-long ZHANG Tao
文章页码：3556 - 3563
Key words：box culvert; vertical earth pressure; soft foundation; centrifugal model test
Abstract: 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.
ZHANG Jun-hui(张军辉)1, 2, YAO Yong-sheng(姚永胜)1, ZHENG Jian-long(郑健龙)1, ZHANG Tao(张涛)3
(1. National Engineering Laboratory of Highway Maintenance Technology
(Changsha University of Science and Technology), Changsha 410114, China;
2. Texas Transportation Institute, Texas A&M University System, College Station, Texas 77843, USA;
3. Hunan Province Highway Administration Bureau, Changsha 410004, China)
Abstract: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.
Key words:box culvert; vertical earth pressure; soft foundation; centrifugal model test
