Research methods: Based on the site geological survey information about water bursting of Cangling Tunnel, the concrete analyses are made for the scale , location , causes and geological conditions of water bursting and the explorations are made on the characteristics of composite of surrounding rock, geological structure, modern structural stress field and underwater from the view of geological engineering point in order to seek the regularity of water bursting and better treatment.
Research results: Water bursting in Gangling Tunnel is controlled by the geological conditions in the zone. Although tuff is not dissolved in water, but the special structure formed under the effect of modem stress field provides the passage and stored area for the underwater. This is the main cause for water bursting. Therefore，the geological prediction in advance system with TSP-203 and relative marks for it should be established and relative measures should be taken with the principle of ”Drainage first and grouting block second".
Research conclusions: For the soil and water disasters occurred in tunnel, first, the research should be done on the engineering geology，then the prediction and treatment should be carried out
2007, Vol. 24 
