Behavior of over-cutting area injected by flyash surface-active agent mixture material

Lubrication can effectively reduce the needed thrust if a discrete layer of the lubricant is maintained between the pipe and the excavated soil. The lubricant must be designed to form a layer in the surrounding soil, be pressurized to overcome ground water pressure and stabilize the over-cutting area. Lubricant should fill the complete over-break void to minimize surface settlement. However, it was clarified that for a commercial lubricant to be effective, it is suggested that ingredients such as sodium and potassium be eliminated. As a result, for a lubricant to not lose its function as a support against the overburden pressure of an overcutting area and to enable a reduction in thrust, it is necessary to develop a better quality lubricant which can overcome these problems as soon as possible. From this perspective, a lubricating material comprised of a mixture of the surface-active agent and flyash was developed. In this paper, in order to examine the characteristics and behavior of the flyash surface-active agent mixture developed for use as a lubricant, a fundamental investigation is performed.