Simulation And Study On Minimum Bedrock Safe Thickness Of Thin Bedrock Big Section Tunnel By UDEC

The stability of thin bedrock big seciton tunnel has to do with the natural factors, such as bedrock thickness, bedrock layered thickness, loose layer thickness, water of overburden, also to do with roadway width and supporting.In this paper the number of plastic element on the roof and both sides of the tunnel and the maximum roof displacement under different geological conditions are obtained, taking a work face in Daliuta mine Shendong group as engineering background, being based on the roof structure of field test (borehole TV), using discrete element method (UDEC) for simulation. And the effect of groundwater seepage to the tunnel Stability is considered, according to analysis features of UDEC fluid-solid coupling. The minimum bedrock safe thickness charts under different conditions are analyzed, where the minimum bedrock safe thickness of tunnel is subjectd to "without plastic element in roof". According to a series of graphs obtained, the minimum bedrock safe thickness of tunnel under different conditions can be checked and providing reference for the reasonable supporting parameters of roadway. These results provide theoretical basis for supporting of thin bedrock big seciton tunnel in some mines Shendong group.