标题：Failure mechanism of bolting support and high-strength bolt-grouting technology for deep and soft surrounding rock with high stress
作者：Li Shu-cai; Wang Hong-tao; Wang Qi; Jiang Bei; Wang Fu-qi; Guo Nian-bo; Liu Wen-jiang; Ren Yao-xi
作者机构：[Li Shu-cai; Wang Hong-tao; Wang Qi; Jiang Bei] Shandong Univ, Res Ctr Geotech & Struct Engn, Jinan 250061, Peoples R China.; [Wang Hong-tao] Shando 更多
通讯作者地址：[Wang, Q]Shandong Univ, Res Ctr Geotech & Struct Engn, Jinan 250061, Peoples R China;[Wang, Q]Yankuang Grp Co Ltd, Postdoctoral Sci Res Stn, Zoucheng 更多
来源：JOURNAL OF CENTRAL SOUTH UNIVERSITY
关键词：high stress; soft rock; bolting support; interface dilation; failure; mechanism; high strength; bolt-grouting technology
摘要：In deep underground mining, the surrounding rocks are very soft with high stress. Their deformation and destruction are serious, and frequent failures occur on the bolt support. The failure mechanism of bolt support is proposed to solve these problems. A calculation theory is established on the bond strength of the interface between the anchoring agent and surrounding rocks. An analysis is made on the influence law of different mechanical parameters of surrounding rocks on the interfacial bond strength. Based on the research, a new high-strength bolt-grouting technology is developed and applied on site. Besides, some helpful engineering suggestions and measures are proposed. The research shows that the serious deformation and failure, and the lower bond strength are the major factors causing frequent failures of bolt support. So, the bolt could not give full play to its supporting potential. It is also shown that as the integrity, strength, interface dilatancy and stress of surrounding rocks are improved, the bond strength will increase. So, the anchoring force on surrounding rocks can be effectively improved by employing an anchoring agent with high sand content, mechanical anchoring means, or grouting reinforcement. The new technology has advantages in a high strength, imposing pre-tightening force, and giving full play to the bolt supporting potential. Hence, it can improve the control effect on surrounding rocks. All these could be helpful references for the design of bolt support in deep underground mines.