A Research on Pre-Grouting Treatment for Water Inrush Disasters During Tunnel Excavation
With the increase of mining depth in a certain mine,mine tunnels face severe challenges posed by water inrush disasters,which have a serious impact on construction safety and production efficiency.The study determined through in-depth analysis that the main causes of water inrush include the water dissolution effect at the contact interface between the limestone and the aquifer,as well as the replenishment of surface precipitation.Based on engineering geology and hydrogeological conditions,the study designed a pre-grouting scheme,including the selection of grouting method,determination of reinforced thickness,selection of grouting materials,calculation of grouting diffusion radius,final hole interval,and grouting section length.Detailed design and planning have been carried out in terms of grouting hole layout,grouting fluid configuration,and grouting construction process.In actual construction,dual-liquid grouting technology was adopted,and grouting parameters were dynamically adjusted based on the suction capacity of the formation.The governance results showed that pre-grouting technology significantly reduced the water inflow from 280 m3/h to 50 m3/h,a decrease of 82.1%,ensuring the safety and stability of the tunnel,and providing reference and guidance for water inflow issues in similar mine construction.
Tunnel water influxPre-grouting technologyLayout of grouting holesGrouting materialPreparation of grouting fluid
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