Expansive pressure characteristic and borehole parameter analysis on large scale borehole soundless cracking

Jiang Nan; Xu Quan-jun; Long Yuan; Liao Yu; Lin Wei

doi:10.11883/1001-1455(2015)04-0467-06

Volume 35 Issue 4

Jun. 2016

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Jiang Nan, Xu Quan-jun, Long Yuan, Liao Yu, Lin Wei. Expansive pressure characteristic and borehole parameter analysis on large scale borehole soundless cracking[J]. Explosion And Shock Waves, 2015, 35(4): 467-472. doi: 10.11883/1001-1455(2015)04-0467-06

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Expansive pressure characteristic and borehole parameter analysis on large scale borehole soundless cracking

doi: 10.11883/1001-1455(2015)04-0467-06

1.
College of Field Engineering, PLA University of Science and Technology, Nanjing 210007, Jiangsu, China
2.
Nanjing Urban Construction Investment Holding (Group) Limited Corporation, Nanjing 210002, Jiangsu, China

Received Date: 2013-12-23
Rev Recd Date: 2014-03-06
Publish Date: 2015-08-10

Abstract

Abstract

Large scale borehole soundless cracking is significantly different from traditional soundless cracking. Experiments were made to measure the expansive pressure of the soundless cracking agent (SCA) working in the boreholes of ∅40 mm and ∅100 mm. The different phenomenon between two sizes of cracking was compared and analyzed to show that the increase of borehole diameter could increase the expansive pressure and speed up the reaction. Based on the experimental data, finite element analysis was utilized to study the stress concentration and stress distribution around the borehole during the cracking process. Using the experimental data and the results of the finite element method, the elastic model of rock stress distribution was modified, and the stress distribution equations were proposed. The formulas of borehole arrangement parameters deduced by those equations are suitable for the actual engineering.
- mechanics of explosion,
- soundless cracking,
- finite element method,
- large scale borehole,
- data fitting,
- stress distribution

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References(13)

References

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