The Deformation and Failure Characteristics Research of the Roof Rocks in Anchorage Areas

Abstract

Aiming at the problems that local roof falls during the roadway driving, similar simulation experiment and numerical analysis experiment is designed to compare and analysis the deformation and failure characteristics in anchorage areas for different supporting forms. The results show that: if the A3 round steelanchoris used to support in the experiment, the rocks loaded 240kg began to appear local caving, the roof loaded 360kg appear fully caving, the ultimate bearing capacity of the roof support structure is achieved, the falling height is 2.4m above the roof. As the distance beyond the bolt anchorage range, the stability of the roof is hardly to maintain. When we choose deformed steel bar bolt, the bearing capacity of supporting structure reach to 624 kg, 73% is increased compared to A3 round steel anchor, and the capacity is greater than the actual load in the overburden; the deformed steel bar bolt make the roof form a complete anchorage structure, increase the bearing capacity of the roof structure.