Rock mass grouting is typically used to reduce leakage into underground structures and increase rock strength. It is costly in terms of both direct cost and the required time to achieve the desired result of grouting and is therefore a tractable process to optimize. Here we describe how the non-Newtonian grout material flows and behaves in thin fractures and fracture networks and how it can be solved numerically and efficiently with complexity beyond one-dimensional approximation. An immiscible two-phase flow formulation, describing the grout and (here) water in the fractures, is compared to a one-dimensional analytic solution. The geomechanical response to grouting is discussed and an efficient boundary condition (using the injectivity; the ratio of injection rate and pressure) to handle a complex fracture network in a numerical model is described and applied to a real-life grout injection data.

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