Water Inrush Prevention

In fact, acrylate systems also penetrate fine-particle, non-cohesive types of soil and solidify these while preserving certain ductility of the stabilized areas at the same time.

To stop only a minor water inrush using this technique, the acrylate gel must be set to its most rapid reaction time (approx. 10-15s). The injection process should be carried out at a flow rate as high as possible via packers with a large inner diameter.

Water and mud inrush is one of the typical geological hazards during tunnel construction in karst areas. In weight of water or mud inrush risks of karst tunnels are studied and the index system for water and mud inrush risk evaluation is established based on an analytic hierarchy process.

The analysis shows that geological structure, formation lithology, and groundwater level are the main control ingredients of water or mud inrush risk geographic and geomorphic conditions, the attitude of rock formation is the minor significant factor surrounding rock mass classification, and rainfall is the least important element.

The main problem is the high void ratio in the soil with high pressure of water, So we must prevent the water to get in the void by using grouting with a special material such as:

• Acrylate gels.
• Polyurethane resin.