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<p>Microwave irradiation has been found efficient in weakening hard rocks through its heating effect. The fracturing and bursting mechanisms of water-bearing sandstones under microwave irradiation have not been well investigated. In this study, six types of sandstones were selected and subjected to microwave irradiation under scenarios of different saturations and power levels. After a comprehensive analysis of the test results, it was revealed that the fracturing and bursting was jointly governed by the thermal stress and steam pressure. The underlying mechanism was related to the interaction between the heating effect and water transfer behavior under microwave irradiation. Furthermore, a prediction model, including the bursting judgement coefficient <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="603_2024_4357_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="41" /> </InlineMediaObject> <EquationSource Format="TEX">\(BJC\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="italic">BJC</mi> </mrow> </math></EquationSource> </InlineEquation> (determining the possibility of bursting) and the bursting capability index <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="603_2024_4357_Article_IEq2.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="39" /> </InlineMediaObject> <EquationSource Format="TEX">\(BCI\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="italic">BCI</mi> </mrow> </math></EquationSource> </InlineEquation> (evaluating the ease or difficulty of bursting), was proposed with consideration of microwave power level, dielectric loss factor, water saturation, tensile strength, and permeability. The model was validated by comparing with experimental data and exhibited a high degree of reliability.</p>

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Bursting of Water-Bearing Sandstones Under Microwave Irradiation: Mechanisms and a Prediction Model

  • 期刊论文

  • 发表日期：

    2025年1月28日

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  • Qinhua Zhao,
  • Yanlong Zheng,
  • Jianchun Li,
  • Xiaobao Zhao

摘要

Microwave irradiation has been found efficient in weakening hard rocks through its heating effect. The fracturing and bursting mechanisms of water-bearing sandstones under microwave irradiation have not been well investigated. In this study, six types of sandstones were selected and subjected to microwave irradiation under scenarios of different saturations and power levels. After a comprehensive analysis of the test results, it was revealed that the fracturing and bursting was jointly governed by the thermal stress and steam pressure. The underlying mechanism was related to the interaction between the heating effect and water transfer behavior under microwave irradiation. Furthermore, a prediction model, including the bursting judgement coefficient \(BJC\) BJC (determining the possibility of bursting) and the bursting capability index \(BCI\) BCI (evaluating the ease or difficulty of bursting), was proposed with consideration of microwave power level, dielectric loss factor, water saturation, tensile strength, and permeability. The model was validated by comparing with experimental data and exhibited a high degree of reliability.