Large-Deformation Failure Mechanism and Stability Control of a Swelling Soft Rock Roadway in a Sea Area: A Case Study in Eastern China

Abstract

Coal mining in sea areas has higher requirements for geological support systems, technical equipment levels, and safety production capacities because of the complex engineering geological conditions of underwater coal mines. In this paper, the deformation failure mechanism and stability control of a typical swelling soft rock roadway in the Beizao coal mine in a sea area are studied. A series of mechanical experiments and theoretical analyses were conducted to research the mechanical properties and reasons for the deformation failure of the swelling soft rock roadway. The type of the large-deformation failure mechanism of the soft rock roadway was identified as type IIIABC, which could be converted to a simple one, such as type IIB. The proposed stability control measure, containing constant-resistance large-deformation bolts, steel mesh, floor hollow grouting cables, and steel fiber concrete, was applied to the site. A good supporting effect was achieved, which could provide a beneficial reference for swelling soft rock roadways in sea areas.