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Electro-Osmosis Dewatering and Consolidation—G-I China Scan Tour Overview
As one of the electrokinetic phenomena, electro-osmosis has been used since 1970s as a soil improvement method to assist dewatering from soil, especially soft clay. The application of electro-osmosis for dewatering or consolidation involves installing anodes and cathodes, which induces directed water movement toward cathode. Over the past decade, due to the invention of different conductive materials, the electrodes can now be made from polymer; as a result, the electrodes can be made into the form of Prefabricated Vertical Drains (PVDs) to serve dual functions. Such development facilitated the wider adoption of electro-osmosis to treat clay soil. G-I sponsored Soil Improvement Committee a scan tour in China in 2018. A large land reclamation project in Taizhou, China, was visited during that scan tour. The soil at the site consisted of 3–4 m of dredging fill that was underlain by approximately 20 m of peat. The reclaimed land will be used for warehouse, roads, and office buildings. The estimated post-construction settlement would be in the magnitude of meters if soil was not treated before construction. Multiple soil improvement methods were utilized to drain the water from dredging soil and peat, among which electro-osmosis was used in one test section. Totally, two hundred electrodes were installed in the sections and connected to DC power. The electric current was monitored and adjusted in real time by a central control unit to ensure a good progress of the dewatering. During our site visit, the measured settlements was in a ranged from 500 to 750 mm, 32 days since the start of electro-osmosis dewatering/consolidation. The settlement values were significantly higher than these obtained from the neighboring sections with conventional vacuum preloading to consolidate the clay. The average energy consumption of the electro-osmosis ranged from 4 to 7 kwh/m3 for the project. The project indicates that the electro-osmosis has great potential to treat clay with the newly developed polymeric electrodes.
Electro-Osmosis Dewatering and Consolidation—G-I China Scan Tour Overview
As one of the electrokinetic phenomena, electro-osmosis has been used since 1970s as a soil improvement method to assist dewatering from soil, especially soft clay. The application of electro-osmosis for dewatering or consolidation involves installing anodes and cathodes, which induces directed water movement toward cathode. Over the past decade, due to the invention of different conductive materials, the electrodes can now be made from polymer; as a result, the electrodes can be made into the form of Prefabricated Vertical Drains (PVDs) to serve dual functions. Such development facilitated the wider adoption of electro-osmosis to treat clay soil. G-I sponsored Soil Improvement Committee a scan tour in China in 2018. A large land reclamation project in Taizhou, China, was visited during that scan tour. The soil at the site consisted of 3–4 m of dredging fill that was underlain by approximately 20 m of peat. The reclaimed land will be used for warehouse, roads, and office buildings. The estimated post-construction settlement would be in the magnitude of meters if soil was not treated before construction. Multiple soil improvement methods were utilized to drain the water from dredging soil and peat, among which electro-osmosis was used in one test section. Totally, two hundred electrodes were installed in the sections and connected to DC power. The electric current was monitored and adjusted in real time by a central control unit to ensure a good progress of the dewatering. During our site visit, the measured settlements was in a ranged from 500 to 750 mm, 32 days since the start of electro-osmosis dewatering/consolidation. The settlement values were significantly higher than these obtained from the neighboring sections with conventional vacuum preloading to consolidate the clay. The average energy consumption of the electro-osmosis ranged from 4 to 7 kwh/m3 for the project. The project indicates that the electro-osmosis has great potential to treat clay with the newly developed polymeric electrodes.
Electro-Osmosis Dewatering and Consolidation—G-I China Scan Tour Overview
Huang, Jie (author) / Shao, Lisheng (author) / Han, Jie (author) / Clemente, Jose (author) / Zhuang, Yanfeng (author)
Geo-Congress 2022 ; 2022 ; Charlotte, North Carolina
Geo-Congress 2022 ; 418-430
2022-03-17
Conference paper
Electronic Resource
English
Electro-Osmosis Dewatering and Consolidation—G-I China Scan Tour Overview
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