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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 2    February 2016

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Failure mechanism of bolting support and high-strength bolt-grouting technology for deep and soft surrounding rock with high stress
LI Shu-cai(李术才)1, WANG Hong-tao(王洪涛)1, 2, WANG Qi(王琦)1, 3, JIANG Bei(江贝)1, WANG Fu-qi(王富奇)3, GUO Nian-bo(郭念波)3, LIU Wen-jiang(刘文江)3, REN Yao-xi(任尧喜)4

1. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China;
2. School of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China;
3. Post-Doctoral Scientific Research Station, Yankuang Group Company Limited, Zoucheng 273500, China;
4. Liangjia Coal Mine, Longkou Coal-Electric Company Limited, Longkou 265700, China

Abstract: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.

 

Key words: high stress; soft rock; bolting support; interface dilation; failure mechanism; high strength; bolt-grouting technology

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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