Effect of sand on the vacuum consolidation of dredged slurry |
| |
| Authors: | Jun Wang Yuanqiang Cai Xueyu Geng Fengqi Xu |
| |
| Institution: | 1. College of Architecture and Civil Engineering, Wenzhou University, Chashan University Town, Wenzhou, China;2. Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation, Wenzhou University, Wenzhou, Zhejiang, China;3. Innovation Center of Tideland Reclamation and Ecological Protection, Wenzhou University, Wenzhou, P. R. China;4. Innovation Center of Tideland Reclamation and Ecological Protection, Wenzhou University, Wenzhou, P. R. China;5. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Zhejiang University, Hangzhou, P. R. China;6. College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, China;7. School of Engineering, University of Warwick, Coventry, UK;8. Department of Civil and Environment Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, China |
| |
| Abstract: | Vacuum preloading is often used to improve the geotechnical properties of dredged slurry. Although the performance of this method has improved with rapidly developing technology, soil columns usually formed on the drainage boundary induce the decrease of permeability around the boundary, thereby limiting the further development of this method. To address this issue, this paper proposes a method for pretreating the slurry combined with sand prior to vacuum consolidation. This method partially replaces the fine particles with sand to reduce the formation of soil columns. Two groups of vacuum preloading tests were performed to investigate the effect of sand content and sand grain size on the vacuum consolidation of dredged slurry. The test results revealed that for a given sand grain size, increasing the sand content of the sand–slurry mixture increased the pore water drainage and accelerated the dissipation of pore water pressure, thereby increasing the vane shear strength. In contrast, for a constant sand content, the samples containing coarse sand exhibited increased pore water drainage and accelerated dissipation of pore water pressure, thereby increasing the vane shear strength of the soil. |
| |
| Keywords: | Dredged slurry sand shear strength vacuum preloading |
|
|
