Pressure control during grout injection behind tunnel linings is crucial for several reasons, all aimed at achieving effective ground support and preventing damage to the lining itself. The primary purpose is to fill voids between the tunnel lining and the surrounding ground completely and uniformly. This ensures that the lining is fully supported and that loads are evenly distributed. Without proper pressure control, the grout may not reach all areas, leaving voids that can lead to instability and settlement. Controlling the pressure als....
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