Grouting Treatment and Parameters Optimization in Watery Karst Areas of High Speed Railway Tunnel Based on Comprehensive Geological Forecast: A Case Study
Table 4
Grouting parameters.
Parameter name
Grouting range
Length
Grout injection 25 m (including stop wall) Excavation length 20 m (including slurry stop wall), set aside 5 m as a safety rock pan
Thickness
Diffusion radius of the slurry
1.5 m
Final pressure of the grouting
3.0~5.0 MPa
Diameter of grouting holes
Φ90mm, Φ130 mm
Grouting speed
10~90 L/min
Spacing of the final hole
≤2.3 m
Grouting technology
Combination of forward segmental grouting, backward segmental grouting, and cluster cuff tube grouting
