A consideration based on the grouting-model for fractured rock mass

A variety of types of grouting models have been proposed. We propose the parallel plates radial flow model with limited geometrical parameters. The model is considered to be useful to the intelligent construction for grouting. Also, the model is applicable mainly to a developed fractured rock mass in which turbulent and laminar flow condition coexists. Therefore the critical Reynolds number is very important to the model, which is related to the transfer condition between laminar and turbulent flow. Thus we conducted laboratory tests in use of single rock fissure and in-situ permeability tests with highly viscous fluid in several dam sights. Moreover, we conducted grouting simulations with the model under consideration on the viscous property of a grout as non-Newtonian fluid. This analysis researched for injection conditions in order to adjust a turbulent-laminar transfer radius to a target grouting radius under a low critical Reynolds number. The result indicates that the condition is available on limited injection pressure, flow rate and grout mix corresponding to each hydraulic fracture-aperture.