Failure mechanism and supporting measures for large deformation of Tertiary deep soft rock

• Published in: International journal of mining science and technology 2015-01, Vol.25 (1), p.121-126
• Main Authors: Guo, Zhibiao, Wang, Jiong, Zhang, Yuelin
• Format: Article
• Language: English
• Subjects: Constant resistance and large deformation bolt; Countermeasures of constant resistance control; Failure mechanism of large deformation; Tertiary deep soft rock; 大变形; 失效机理; 开采深度; 支护技术; 深部软岩巷道; 第三纪; 能量吸收; 配套
• ISSN: 2095-2686
• DOI: 10.1016/j.ijmst.2014.11.002

The Shenbei mining area in China contains typical soft rock from the Tertiary Period. As mining depths increase, deep soft rock roadways are damaged by large deformations and constantly need to be repaired to meet safety requirements, which is a great security risk. In this study, the characteristics of deformation and failure of typical roadway were analyzed, and the fundamental reason for the roadway deformation was that traditional support methods and materials cannot control the large deformation of deep soft rock. Deep soft rock support technology was developed based on constant resistance energy absorption using constant resistance large deformation bolts. The correlative deformation mechanisms of surrounding rock and bolt were analyzed to understand the principle of constant resistance energy absorption. The new technology works well on-site and provides a new method for the excavation of roadwavs in Tertiary deed soft rock.