关键词: 涌水事故, 强透水地层, 承压水

Abstract: This paper presents the treatment process and causes analysis of the water gushing hazard in the process of a deep excavation in a subway station construction in Fuzhou. The lessons learned are as follows: Thick and strong permeable stratum has the characteristics of the large water volume and the strong permeability. The bottom of the excavated area has been sealed and reinforced, so that the water layer below the reinforcement layer has pressure bearing. On the basis of meeting the stability requirements of the artisan water against the sudden surge, the deep excavation should fully consider whether there are weak parts in the reinforcement layer through pumping test before construction. During the excavation process, the normal operation of the dewatering well should be ensured, and the occurrence of the water gushing hazard can prevent the expansion of the hazard. If the monitoring data changes greatly, the earth covering and backfilling should be conducted in time to ensure the safety of the excavated area. After the backfilling, the water gushing part should be blocked and grouted to ensure that the safety situation is controlled before the excavation.

Key words: Water Gushing Hazards, Highly Permeable Stratum, Artisan Water