Grouting technology was an effective technical means to control the geological disasters in tunnel construction

including collapse and inrush of clay and water. As for the complex structure and advantage joint development of the water-rich fault

the grouting theory and control technology had not been mature yet. Based on the typical internal rock mass structure of water-rich fault zone

a model of grouting was established. Then concept of advantage-fracture grouting was proposed. Based on the assumption of generalized Bingham fluid and single plate model of advantage-fracture grouting diffusion

a control equation for calculating the diffusion distance was developed considering the rheology behaviors of grout. It showed that the grouting diffusion distance was mainly controlled by the grouting pressure

grouting rate and the rheological parameters of grout. And the influence laws of the three factors on the diffusion distance were discussed. On this basis

the method of controlled grouting was established. Three key technology of grouting which were the grouting rate gradient control

gradient control of grouting rate and dynamic regulation of control-fluid were concluded

which impelled grout constrained diffusion in the advantage of structure. The research results were successfully applied to the tunnel fracture zone collapse in Jiangxi province and played a positive role in promoting the theoretical research and engineering practice of geological disaster.