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Arabian Journal of Geosciences

, 12:577 | Cite as

The in situ hydraulic properties of fault zones in mine roadway floor

  • Ziwei QianEmail author
  • Huilei Wu
Review Paper
  • 14 Downloads

Abstract

In this study, we explored the hydraulic properties of the fault zone at different positions of roadway floor using in situ high-pressure water injection tests under controlled water injection. During the test, injecting water flow rate and pressure as well as water pressure in the monitor borehole were continuously measured and recorded. The test results showed that changes of injecting water pressure in the fault zone obey the changing characteristics of the typical hydraulic fracturing pressure. Analysis of the test results showed that the hydraulic process could be divided into original and post-fracture stages at the breakdown pressure. In the original stage, the flow dimension (v) continuously increased. In the post-fracture stage, the equivalent hydraulic fracture aperture (b) also continuously increased even when the flow rate decreased. The fracturing-induced fractures were scoured during water injection. In addition, the original hydraulic conductivity (K) of the fault zone decreased while the hydraulic fracturing breakdown pressure (P0) increased with the distance (D) of the test point to the roadway floor increasing. The main cause for these phenomena was the difference in the stress states of the fault zone at different locations of the roadway floor.

Keywords

Fault zone Water injection test Hydraulic conductivity Fluid dimension Scouring 

Notes

Acknowledgments

The authors would like to thank all of the peoples who participated in the fieldwork described in this paper.

Funding information

This study is supported by the National Science Youth Foundation of China (Grant No. 41602299).

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  1. 1.School of Resources and Earth SciencesChina University of Mining and TechnologyXuzhouChina
  2. 2.State Key Laboratory for Geomechanics and Deep Underground EngineeringChina University of Mining and TechnologyXuzhouChina

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