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Shock and Vibration
Volume 2015, Article ID 371948, 8 pages
http://dx.doi.org/10.1155/2015/371948
Research Article

Study on Monitoring Rock Burst through Drill Pipe Torque

Academy of Rock Burst, Liaoning Technical University, Fuxin 123000, China

Received 13 October 2014; Revised 5 January 2015; Accepted 5 January 2015

Academic Editor: Shimin Liu

Copyright © 2015 Zhonghua Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presents a new method to identify the danger of rock burst from the response of drill pipe torque during drilling process to overcome many defects of the conventional volume of drilled coal rubble method. It is based on the relationship of rock burst with coal stress and coal strength. Through theoretic analysis, the change mechanism of drill pipe torque and the relationship of drill pipe torque with coal stress, coal strength, and drilling speed are investigated. In light of the analysis, a new device for testing drill pipe torque is developed and a series of experiments is performed under different conditions; the results show that drill pipe torque linearly increases with the increase of coal stress and coal strength; the faster the drilling speed, the larger the drill pipe torque, and vice versa. When monitoring rock burst by drill pipe torque method, the index of rock burst is regarded as a function in which coal stress index and coal strength index are principal variables. The results are important for the forecast of rock burst in coal mine.