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An Experimental Investigation of the Risk of Triggering Geological Disasters by Injection under Shear Stress

Fluid injection has been applied in many fields, such as hazardous waste deep well injection, forced circulation in geothermal fields, hydraulic fracturing, and CO(2) geological storage. However, current research mainly focuses on geological data statistics and the dominating effects of pore pressur...

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Detalles Bibliográficos
Autores principales: Liu, Yixin, Xu, Jiang, Peng, Shoujian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5144011/
https://www.ncbi.nlm.nih.gov/pubmed/27929142
http://dx.doi.org/10.1038/srep38810
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author Liu, Yixin
Xu, Jiang
Peng, Shoujian
author_facet Liu, Yixin
Xu, Jiang
Peng, Shoujian
author_sort Liu, Yixin
collection PubMed
description Fluid injection has been applied in many fields, such as hazardous waste deep well injection, forced circulation in geothermal fields, hydraulic fracturing, and CO(2) geological storage. However, current research mainly focuses on geological data statistics and the dominating effects of pore pressure. There are only a few laboratory-conditioned studies on the role of drilling boreholes and the effect of injection pressure on the borehole wall. Through experimental phenomenology, this study examines the risk of triggering geological disasters by fluid injection under shear stress. We developed a new direct shear test apparatus, coupled Hydro-Mechanical (HM), to investigate mechanical property variations when an intact rock experienced step drilling borehole, fluid injection, and fluid pressure acting on the borehole and fracture wall. We tested the peak shear stress of sandstone under different experimental conditions, which showed that drilling borehole, water injection, and increased pore pressure led to the decrease in peak shear stress. Furthermore, as pore pressure increased, peak shear stress dispersion increased due to crack propagation irregularity. Because the peak shear stress changed during the fluid injection steps, we suggest that the risk of triggering geological disaster with injection under shear stress, pore, borehole, and fluid pressure should be considered.
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spelling pubmed-51440112016-12-16 An Experimental Investigation of the Risk of Triggering Geological Disasters by Injection under Shear Stress Liu, Yixin Xu, Jiang Peng, Shoujian Sci Rep Article Fluid injection has been applied in many fields, such as hazardous waste deep well injection, forced circulation in geothermal fields, hydraulic fracturing, and CO(2) geological storage. However, current research mainly focuses on geological data statistics and the dominating effects of pore pressure. There are only a few laboratory-conditioned studies on the role of drilling boreholes and the effect of injection pressure on the borehole wall. Through experimental phenomenology, this study examines the risk of triggering geological disasters by fluid injection under shear stress. We developed a new direct shear test apparatus, coupled Hydro-Mechanical (HM), to investigate mechanical property variations when an intact rock experienced step drilling borehole, fluid injection, and fluid pressure acting on the borehole and fracture wall. We tested the peak shear stress of sandstone under different experimental conditions, which showed that drilling borehole, water injection, and increased pore pressure led to the decrease in peak shear stress. Furthermore, as pore pressure increased, peak shear stress dispersion increased due to crack propagation irregularity. Because the peak shear stress changed during the fluid injection steps, we suggest that the risk of triggering geological disaster with injection under shear stress, pore, borehole, and fluid pressure should be considered. Nature Publishing Group 2016-12-08 /pmc/articles/PMC5144011/ /pubmed/27929142 http://dx.doi.org/10.1038/srep38810 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Liu, Yixin
Xu, Jiang
Peng, Shoujian
An Experimental Investigation of the Risk of Triggering Geological Disasters by Injection under Shear Stress
title An Experimental Investigation of the Risk of Triggering Geological Disasters by Injection under Shear Stress
title_full An Experimental Investigation of the Risk of Triggering Geological Disasters by Injection under Shear Stress
title_fullStr An Experimental Investigation of the Risk of Triggering Geological Disasters by Injection under Shear Stress
title_full_unstemmed An Experimental Investigation of the Risk of Triggering Geological Disasters by Injection under Shear Stress
title_short An Experimental Investigation of the Risk of Triggering Geological Disasters by Injection under Shear Stress
title_sort experimental investigation of the risk of triggering geological disasters by injection under shear stress
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5144011/
https://www.ncbi.nlm.nih.gov/pubmed/27929142
http://dx.doi.org/10.1038/srep38810
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