Abstract:

Today, in Vietnam, the determination of support structures in underground mines, which is determined by experience or analytical solutions. In this article, author uses finite element method to determine the plastic zone surrounding the adit. It bases on rock and rock-mass properties, adit's depth,... These calculations are performed in Leases: medium strength and geneous rock; weak rock. As the', the author estimates to the Nation between plastic zone size and depth and rock properties. The result be applied for designing and ructing adits in underground mines at g Ninh coal basin.