2-D cylindrical test on HKMD slurry under surcharge
2-D cylindrical test on HKMD slurry with horizontal drain at bottom
Led by Ir Prof. Jian-hua YIN, management committee member of RILS and Chair Professor of Soil Mechanics at the Department of Civil and Environmental Engineering (CEE), the research team has developed and implemented an innovative technique using horizontal band drains in the aid of vacuum preloading method to facilitate the possible reuse of dredged sediment as fill material in future reclamation projects in Hong Kong. Three physical model tests are ongoing in order to simulate the whole process of implementing the new soft soil improvement method, including the dredging process, self-weight consolidation process, and fast consolidation process by vacuum preloading with prefabricated band drains. The preliminary test results well proved that the new method is capable of decreasing water content and increasing soil strength in an efficient and economical way. For example, it can be observed in large-scale plane strain physical model that the average water content of dredged sediment decreased from 220% to 76% and the shear strength of sediment increased from almost zero to 27 kPa at the bottom of model within 100 days of applying vacuum pressure. As the following work, a mechanical-chemical combined method, which incorporates binder stabilization using industrial wastes and vacuum preloading with prefabricated band drains at the same time, will be further investigated to propose a sustainable way in the marine reclamation practice.
A Hydraulic Laboratory visit and clay reclamation model test demonstration were hosted by Prof. YIN to Departmental Advisory Committee of CEE, led by Ir Chun-kit LAU, Ricky, JP, Permanent Secretary for Development (Works) of Development Bureau. Please click here for details.
| Research Units | Research Institute for Land and Space |
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