Abstract: The feasibility of treating water burst using cement-based fiber glass slurry is investigated via theoretical, numerical, and engineering approaches. The crack control mechanism as well as the influence of slurry on the elastic modulus, cohesion, and internal friction angle of rock are examined. Moreover, the validity of the numerical simulation is obtained according to monitoring results of water burst and surrounding rock deformation. Results evince that fiber glass attenuates the stress development of cracks and reduces the stress intensity factor at the tip of crack. In addition, the vertical and horizontal displacements of surrounding rock in different working conditions are acquired according to comparative analysis before and after grouting. Cement-based glass fiber slurry is manifested to be feasible through engineering test and data analysis of the simulation results.

Key words: tunnel, cement-based fiber glass slurry, grouting and water plugging, water burst, numerical simulation