Effects of fracture grouting with sodium hydroxide during electro-osmosis on clay |
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| Authors: | Jun Wang Ziyang Gao Lingyu Li Hongtao Fu Yuanqiang Cai |
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| 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. Department of Civil Engineering, Shanghai University, Shanghai, PR China;5. Innovation Center of Tideland Reclamation and Ecological Protection, Wenzhou University, Wenzhou, P.R. China;6. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Zhejiang University, Hangzhou, P.R. China;7. College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, China |
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| Abstract: | ABSTRACTElectro-osmosis is a foundation treatment method for clay that is not widely used because of its nonuniform consolidation effect and high cost. To overcome these limitations, this study investigates fracture grouting. To determine the optimal grouting method, anode grouting, polyurethane grouting, and fracture grouting were first compared in one-dimensional electro-osmosis consolidation tests using self-made model boxes under an equal electric potential gradient, and then different solution concentrations were tested. By comparing the current, drainage rate, and coefficient of energy consumption during the electro-osmosis process, as well as moisture content, electrical conductivity, and shear strength after the tests, the moisture and shear strength of clay after electro-osmosis were found to be significantly improved by adding chemical reagents at the fracture. In addition, the optimum concentration of fracture grouting was determined to be 1.5%, and the shear strength after testing of clay that had been treated with sodium hydroxide was found to be higher than that of the control group. However, the effects of fracture grouting in the early stage were clearer than the effects of fracture grouting at later stages. |
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| Keywords: | Clay concentration electro-osmosis fracture grouting grouting method sodium hydroxide |
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