Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Electro-osmotic consolidation of marine hydraulically filled sludge ground using electrically conductive wick drain combined with automated power supply
Electro-osmosis (EO) methods have not been widely used for the drainage consolidation of soft clay soils in practice because of two key problems; (i) metallic electrode corrosion, and (ii) high electric energy consumption. With recent advancements of conductive plastics, there has been interest in using conductive plastic electrodes instead of metallic electrodes to accelerate drainage of soft clay soils. This paper presents the details of a field EO test using a type of new patented electrically conductive wick drain (ECWD) and a specially designed automated power supply (APS) on a hydraulically filled sludge ground in Jiangsu Province, China. The in-situ investigations and laboratory tests were conducted to evaluate the improvement effectiveness after performing EO treatment for a period of 36 days (including a continuing intermittence of 16 days). The results suggest that the EO technique using the ECWD combined with the APS (i) decreased the average moisture content of the sludge from 62 to 39%; (ii) increased the vane shear strength from ∼0 to 25.5 kPa. In addition, the ground bearing capacity also increased from ∼0 to 74 kPa. The electric energy consumption for this EO treatment is 5.6 kWh/m3. Moreover, the prediction models for electric current I and cumulative drainage Q during EO are validated using data from the present field and laboratory tests. Investigations to date suggest that the new ECWD combined with APS presented in this paper is encouraging for consolidating the large area of soft clay soil with high water content to achieve favourable conditions with respect to increase in shear strength at an acceptable cost.
Electro-osmotic consolidation of marine hydraulically filled sludge ground using electrically conductive wick drain combined with automated power supply
Electro-osmosis (EO) methods have not been widely used for the drainage consolidation of soft clay soils in practice because of two key problems; (i) metallic electrode corrosion, and (ii) high electric energy consumption. With recent advancements of conductive plastics, there has been interest in using conductive plastic electrodes instead of metallic electrodes to accelerate drainage of soft clay soils. This paper presents the details of a field EO test using a type of new patented electrically conductive wick drain (ECWD) and a specially designed automated power supply (APS) on a hydraulically filled sludge ground in Jiangsu Province, China. The in-situ investigations and laboratory tests were conducted to evaluate the improvement effectiveness after performing EO treatment for a period of 36 days (including a continuing intermittence of 16 days). The results suggest that the EO technique using the ECWD combined with the APS (i) decreased the average moisture content of the sludge from 62 to 39%; (ii) increased the vane shear strength from ∼0 to 25.5 kPa. In addition, the ground bearing capacity also increased from ∼0 to 74 kPa. The electric energy consumption for this EO treatment is 5.6 kWh/m3. Moreover, the prediction models for electric current I and cumulative drainage Q during EO are validated using data from the present field and laboratory tests. Investigations to date suggest that the new ECWD combined with APS presented in this paper is encouraging for consolidating the large area of soft clay soil with high water content to achieve favourable conditions with respect to increase in shear strength at an acceptable cost.
Electro-osmotic consolidation of marine hydraulically filled sludge ground using electrically conductive wick drain combined with automated power supply
Zou, Wei-Lie (Autor:in) / Zhuang, Yan-Feng (Autor:in) / Wang, Xie-Qun (Autor:in) / Vanapalli, Sai K. (Autor:in) / Huang, Yun-Lan (Autor:in) / Liu, Fei-Fei (Autor:in)
Marine Georesources & Geotechnology ; 36 ; 100-107
02.01.2018
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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