Abstract:

To investigate the propagation regularity of multiple-hole fracture grouting, a numerical model was used to simulate the simultaneous multiple-hole fracture grouting. The numerical method considered the coupling of mesh element damage and the stress distribution. The propagation process of single-hole and multiple-hole simultaneous fracture grouting can be numerically simulated. Simulation results showed that when multiple holes were injected simultaneously, fractures among grouting holes might change their propagation direction and go towards each other. Grouting holes spacing had significant influence on the deflection direction of grout veins. Furthermore, when multiple holes were grouted simultaneously,the uplift displacement was larger than the sum of uplift displacements when each grouting hole separately grouted. Results indicated that multiple-hole simultaneous grouting induced grouting veins to attract each other, which was beneficial to the formation of grouting curtains and better uplift effect.

Key words: propagation regularity, finite element method, multiple-hole, fracture grouting