Geotechnical and Geological Engineering

, Volume 36, Issue 1, pp 589–597 | Cite as

Effect of Saturation Time on the Coal Burst Liability Indexes and Its Application for Rock Burst Mitigation

Technical note
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Abstract

Coal seam water infusion is one of the widely used techniques for rock burst mitigation, and the saturation time of coal is one of the essential factors influencing the effectiveness of water infusion. To analyze the effect of saturation time on coal burst liability indexes, bursting liability indexes of coal specimens taken from No. 2 mining face in Changgouyu Mine in Beijing were tested under natural state and different saturation time. Compared with coal specimens under natural state, the uniaxial compressive strength, elastic strain energy index, and bursting energy index all decrease in different degrees as the saturation time increases. The dynamic failure duration, however, shows an opposite tendency. When the saturation time is 0–6 days, the bursting liability indexes vary significantly, but when the saturation time is longer than 6 days, this phenomenon is not very obvious. When the saturation time increases from 0 to 6 days, the uniaxial compressive strength, elastic strain energy index, and bursting energy index decreases from 18.31 to 7.15 MPa, 2.59 to 1.25, 3.04 to 1.20, respectively, but when the saturation time increases from 6 to 8 days, their corresponding increments are only 0.02–0.05. Moreover, the time of coal seam water infusion in No. 2 mining face was designed 6–8 days based on the test results. Practical experiences show that excellent destress effect was achieved by water infusion. After coal seam water infusion, the average moisture content of coal seam increases from 0.85 to 1.26%, and the width of destress zone increases from 0–4 to 0–6 m.

Keywords

Rock burst Water infusion Saturation time Bursting liability Mitigation 
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Notes

Acknowledgements

The research described in this paper was financially supported by National Natural Science Foundation of China (No. 51674160 and No. 51474137), State Key Research Development Program of China (No. 2016YFC0801401), Tai’shan Scholar Engineering Construction Fund of Shandong Province of China, Taishan Scholar Talent Team Support Plan for Advantaged & Unique Discipline Areas, Shandong Province Science and Technology Development Plan Item (No. 2014GSF120002), China Postdoctoral Science Foundation Funded Project (No. 2016M592220).

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and TechnologyShandong University of Science and TechnologyQingdaoChina
  2. 2.College of Mining and Safety EngineeringShandong University of Science and TechnologyQingdaoChina
  3. 3.National Demonstration Center for Experimental Mining Engineering EducationShandong University of Science and TechnologyQingdaoChina

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