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Experimental Study on Swelling Property and Gas Flow in a Compacted Bentonite-Sand Sample

  • Hong-Yang Ni
  • Jiang-Feng Liu
  • Jing-Na Guo
  • Xu-Lou Cao
  • Shuai-Bing Song
Conference paper
Part of the Environmental Science and Engineering book series (ESE)

Abstract

This paper focuses on the experimental research on swelling properties gas migration in a compacted bentonite-sand plug. The aim is to investigate the swelling behaviour, gas breakthrough pressure as well as its sealing efficiency. Results show that bentonite-sand swelling is incomplete from 4 MPa gas pressure, so that gas breakthrough occurs at very low pressures (on the order of 1 MPa). Gas permeability of the bentonite-sand plug is affected by the variation in the confining pressure, so that tightness to gas can be achieved at a certain coupled hydro-mechanical condition. Specially, when the confining pressure is equal to 7 MPa and the water saturation degree is 86–91%, gas permeability can decrease to 10−20 m2.

Keywords

High-level radioactive waste Bentonite Gas permeability 

Notes

Acknowledgments

The authors are grateful to the financial support from the Fundamental Research Funds for the Central Universities (Grant No. 2018ZZCX04).

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Hong-Yang Ni
    • 1
    • 2
  • Jiang-Feng Liu
    • 1
    • 2
  • Jing-Na Guo
    • 1
  • Xu-Lou Cao
    • 1
  • Shuai-Bing Song
    • 1
  1. 1.The State Key Laboratory for GeoMechanics and Deep Underground Engineering, and School of Mechanics and Civil EngineeringChina University of Mining and TechnologyXuzhouChina
  2. 2.The State Key Laboratory of Oil and Gas Reservoir Geology and ExploitationSouthwest Petroleum UniversityChengduChina

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