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| Model test on treatment of soft clay under combined vacuum preloading with electro-osmosis using prefabricated horizontal drain |
| WANG Liujiang1，CHEN Qiangqiang1，2，LIU Sihong1，FU Yingjie1 |
| (1. College of Water Conservancy and Hydropower，Hohai University，Nanjing，Jiangsu 210098，China；2. Gansu Water Conservancy and Hydropower Survey and Design Research Institute Co.，Ltd.，Lanzhou，Gansu 730000，China) |
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Abstract Considering the existed shortages of the method combining vacuum preloading with electro-osmosis using prefabricated vertical drain(EPVD)，a new method combining vacuum preloading with electro-osmosis using prefabricated horizontal drain(EPHD) is proposed in this study. Thus，the model tests for both EPHD and EPVD were conducted，respectively，for comparison. Through the result of drainage，electric current and potential during the test，and settlement，water content and shearing strength of different parts of soil after the test，it is found that EPHD has a remarkable advantage in accelerating consolidation over EPHD. Compared with EPVD，the final drainage of EPHD increased about 21.7%，while the final settlement increased by 10.9%. The soil thickness between the anode and the cathode decreases in the EPHD，which not only shortens the path of drainage，but also prevents the decrease of current and effective potential applied on the soil，to improve the electro-osmotic consolidation. Moreover，the water content after the EPHD is obviously smaller than that of EPVD，and the soil strength also increases significantly for EPHD，especially at the place near the anode. However，there exists a nonuniformity for soil treated by EPHD，for relatively small effect on soil consolidation at the cathode. In addition，the energy consumption of electro-osmosis is reduced remarkably for EPHD with the same drainage. In summary，EPHD shows great advantages from the efficiencies of dewatering，reinforcement，and economy，and the further studies are necessary for its field application to treat the hydraulic reclamation slurry.
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2020, Vol. 39 
