Failure mechanism of bolting support and high-strength bolt-grouting technology for deep and soft surrounding rock with high stress

作     者：李术才 王洪涛 王琦 江贝 王富奇 郭念波 刘文江 任尧喜 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：Research Center of Geotechnical and Structural EngineeringShandong University School of Civil EngineeringShandong Jianzhu University Post-Doctoral Scientific Research StationYankuang Group Company Limited Liangjia Coal MineLongkou Coal-Electric Company Limited 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2016年第23卷第2期

页      面：440-448页

核心收录：

学科分类：0810[工学-信息与通信工程] 0806[工学-冶金工程] 081401[工学-岩土工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0814[工学-土木工程] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：Projects(51304125,51379114)supported by the National Natural Science Foundation of China Project(BS2013NJ004)supported by Award Fund for Outstanding Young and Middle-Aged Scientist of Shangdong Province,China Project(201301004)supported by the Innovation Fund for Postdoctor of Shandong Province,China 

主　　题：失效机理 注浆技术 高强锚杆 岩锚支护 界面粘结强度 高应力 锚杆支护设计 高强螺栓 

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.