| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 99 === Nowadays the electrode arrangement of the electroosmotic chemical grouting in the field still adopts that suggested in the pure electroosmotic method because of deficiency in research. Therefore, the cemented zone of soil often occurs only near the electrode pipe. If the electrode arrangement is inappropriate, the cemented zone will be less than expected. The objective of this study is to investigate the cemented zone when calcium chloride solution is used as an injection material. A series of laboratory electroosmotic chemical treatment tests was carried out for different electrode sizes, input voltages and spacing of steel pipes. After the tests, cemented zones, pH values, cone resistances, water contents, and concentrations of Ca2+ in kaolinite at different locations were measured and discussed. Finally, the experimental results are analyzed with a suitable theory of electricity. Results show that the cemented zone normally occurs when pH values near the cathode is greater than 9. for small size of electric plates, which the boundary of the electroosmotic cell does not restrained from the development of cemented zones, the shape of cemented zones are highly related to the electric field and close to cylinder centering to the electric plate. The extensions of cemented zones for four different sizes of electro-plates are all equal to 40 mm. The extension of cemented zones is enlarged to N^0.5 times when the electric field increases by N times. A simple method is thus developed to estimate the possible range of cemented zone for different sizes of electrodes based on an electroosmotic experimental result.
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