PHYSICAL MODEL FOR ROCKBURST BASED ON ACOUSTIC EMISSION
Rockburst is one drastic type of rock failure and a hazard to the production and safety of underground mining and tunnelling. It is a difficult problem to describe the mechanism of rockburst. From the point of solid physics and mesomechanics, a bond spring model of rock failure (BSMRF) was given upon acoustic emission (AF.) of rock damage and a virtual bond spring, which represents the elastics and plastics of compression and tension and rotation of rock bond. Applied to the analysis of damage development and energy change of rock failure, the model gives a criterion of fracture development, which is called virtual remaining energy. According to the AE pattern of rock failure, the paper gives three types of rock failure, i.e. whole-course-pattern, end-course-pattern, and burst-pattern. The burst-pattern rock failure is rockburst. Through analysis of three rock samples based on BSMRF, it was found that AF. during the loading, ruptured particle distribution, and their surface area of rockburst are very distinctive. It indicates that the failure of the last series of bond spring has decisive influence to rock failure. In one pattern of rock failure, the ratio of the last bond springs of rockburst has a sharp difference from the common, which took more than a half of the total. When the result is applied to the explanation of size effect, confining pressure effect, and some other rockburst phenomena, it is found that reasonable explanation can be obtained.
XU-BIAO DENG WEN-FENG DU GANG XU XU-BIAO DENG WEN-FENG DU GANG XU
School of Safely and Resource Engineering, China University of Mining and Technology (Beijing), Beij State Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology, B
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
1597-1604
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）