Development of Grouting Material for Fly Ash Backfilling by Application of Chemical Injection

摘要

The technology of grouting, like the several other ground improvement methods, is in a constant state of flux, with new materials and construction techniques being developed constantly. Modern grouting began in the mining industries, concerned with seepage and strength control in mines, tunnels and shafts, then was taken up by civil engineering. In order to reduce the water flow through soil or fractured rock mass, grouting is a commonly used method and a very important method. In particular, in dam construction, grouting is the method used abundantly to ensure water-tightness and tightness. Generally, grouting in dam construction is the construction method that soil voids and crack around borehole is filled by pressurized injection of grouting material such as cement and permeability or mechanical characteristics of rock mass is improved. It was previously mentioned that backfilling material plays an important role as a support against overburden pressure after finishing construction. Therefore most of the underground deformations caused by the injection may be caused by changing the condition of surrounding rock masses and numbers of cracks. That is why the discussion of appropriate injection methods, etc. in preparation for such changes is inevitable. From this point of view, the new backfilling material can be developed for several kinds of soil conditions in this paper.