Solutions
Four solutions are summarized for different scenarios: defect treatment of hydropower engineering, defect treatment of high-speed rail transit engineering, defect treatment of water resource environment engineering, and defect treatment of new energy power generation engineering
Emergency repair of water leakage during shield tunneling entry and exit at the subway terminal shaft
- Project Background:
For shield/pipe jacking tunnels, in addition to the spiral machine gushing and tail seepage during the normal excavation phase, the main risk points are the shield entry and exit phases; if a large amount of water and soil is lost, especially if a large amount of soil at the bottom of the tunnel is lost, it is very dangerous.
Exit risk 1: Gushing and seepage occur during the process of the shield machine not reaching the entrance ring and removing the retaining structure;
Exit risk 3: Gushing and seepage still occur when the shield machine exits the reinforced area;
Entry risk 1: The shield machine reaches the retaining structure, but the soil pressure in the soil chamber cannot be completely relieved;
Entry risk 2: Seepage occurs when the shield machine reaches the retaining structure, and the retaining structure has been removed
- Emergency grouting scheme:
Leading scheme (supplementary backfilling and pressure balancing measures may be required as necessary)
Polyurethane grouting is performed through pre-embedded holes in the tunnel lining segments. The grout, carried by water flow, enters the gaps between the lining segments and the reinforced area, the openings, and damaged areas of the steel plates. Grouting is performed at the tail of the shield and around the shield to reinforce the soil and seal the water inflow channels. Care must be taken in material selection and grouting methods to avoid solidifying the shield. To prevent shield sinking, appropriate grouting should be performed at the bottom of the shield's middle section.
- Material Selection:
9105 emergency oil-soluble polyurethane grouting material (flame-retardant type), cement-water glass double-liquid slurry;
Material System Selection:
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