Journal Published Online: 25 January 2021
Volume 49, Issue 6

Study of the Distribution and Change Law of Stress in Subgrade Immersed in Water in the Hetao Irrigation Area

CODEN: JTEVAB

Abstract

The Bayan Nur Section of the Jing-Xin Expressway is located in the Hetao irrigation area. In this area, open river flooding is employed to irrigate the farmland, which causes seasonal subgrade immersion. With the fluctuation in the water levels, the water content of the subgrade soil increases, and the soil strength decreases due to water infiltration and capillary action. Thus, a field test section is built for long-term monitoring of the earth pressure, pore pressure, and settlement, and gravel cushion and reinforcement materials are utilized to reinforce the foundation in the test section. The test results show that the tidal variation in the groundwater level is obvious during the irrigation season, with the maximum increase in the pore pressure being 147.7 %, and the highest water level being 0.9 m above the ground. The change of subgrade soil moisture content and subgrade buoyancy results in the change of subgrade base pressure direction. The pressure distribution of the subgrade base after the reinforcement of the sand-gravel cushion and geotechnical materials presents an inverted bell type, which is similar to the pressure distribution of the rigid foundation base. The restraint and tension film effect of the cushion and reinforcement materials helps in improving the rigidity of the subgrade base.

Author Information

Shen, Zuo
Department of Civil Engineering, Shandong Jiaotong University, University Science Park, Jinan City, Shandong Province, China
Jin, Li
Department of Civil Engineering, Shandong Jiaotong University, Jinan City, Shandong Province, China
Xin-zhang, Cui
Department of Civil Engineering, Shandong University, Jinan City, Shandong Province, China
Miao-zhang, Yu
Department of Civil Engineering, Shandong Jiaotong University, Jinan City, Shandong Province, China
Pages: 10
Price: $25.00
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Details
Stock #: JTE20190845
ISSN: 0090-3973
DOI: 10.1520/JTE20190845