Road tunnel excavation often traverses coal strata,which is at risk of firedamp explosion that usually results in disaster.Airtight concrete grouting is popularly used in this kind of tunnel project,Based on the essential theory of mechanics of fluids in prous media,the principle of improving concrete airtight property and its influential factors are investigated.The proportioning tests and monitoring method for airtight concrete are introduced,which is illustrated by a case study applied to the project of the Huayinshan Tunnel.It is proved by engineering practices that the achievement of this research work is beneficial to tunneling project across coal strata.
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