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THMC多場耦合作用下巖石力學實驗與數值模擬研究進展

Research review of rock mechanics experiment and numerical simulation under THMC multi-field coupling

  • 摘要: 巖石多場耦合作用的研究是當前研究的熱點難點問題,為了更好的分析巖石在多場耦合作用條件下的作用機理,主要通過實驗和數值模擬兩方面進行研究。在總結國內外多場耦合微觀–細觀–宏觀多尺度力學試驗設備的改進和研發、數值模擬軟件及耦合計算程序的開發等方面的研究現狀的基礎上,展望多場多相耦合作用下巖石力學實驗設備和數值分析的研究方向。為了研究巖石多場耦合作用下的力學性能,通過改進和研發設計了不同物理場多場耦合試驗系統,在開發試驗設備的基礎上引起和發展現代無損探測手段,比如實時CT(Computed tomography)掃描技術,電鏡掃描技術(SEM)、核磁共振技術(NMRI)、X射線立體成像法、超聲波技術等,既能無損檢測到巖石的內部孔隙微細觀結構及演化過程,也能得出巖石在溫度?水流?應力?化學(THMC)多場耦合作用中各物理場的宏觀關系,進一步從微細觀和宏觀相結合的角度得出巖石在多場耦合作用下的性能。隨著計算機技術的進步,巖石多場耦合作用下的數值模擬軟件及耦合計算程序的開發有了一定的發展,特別是TOUGHREACT與FLAC3D相結合的THMC四場耦合作用的數值模擬軟件和數值仿真軟件Comsol與Matlab對接的多場耦合計算程序的開發,為巖石多場耦合模擬的開展提供了技術支持。

     

    Abstract: The study of multi-field coupling of rocks is currently a pressing and difficult problem at present. To better analyze the interaction mechanism of rocks under of multi-field coupling, research is mainly carried out by experiment and numerical simulation. On the basis of summarizing the research and development of multi-field coupling micro-meso-macro multi-scale mechanical test equipment at home and abroad, and the developments of numerical simulation software and coupling calculation program, the development direction of rock mechanical test equipment and numerical analysis under multi field and multi-phase coupling are prospected. To study the mechanical properties of rocks under multi-field coupling, a multi-field coupling test system with different physical fields was designed by improvement through research and development. Based on the development of the test equipment, modern non-destructive detection methods, such as real-time computed tomography (CT) scanning technology, scanning electron microscopy (SEM), nuclear magnetic resonance imaging (NMRI), X-ray stereo imaging and ultrasonography, were developed. Acoustic wave technology can not only nondestructively detect the micro-structure and evolution process of rock internal pores, but also clarify the macro-relationship of rock physical fields in the multi-field coupling action of thermal-hydrological-mechanical-chemical (THMC), and further clarify the rock performance under multi-field coupling action from the perspective of a combination of micro and macro scales. With the advancement of computer technology, the development of numerical simulation software and coupling calculation program under multi-field coupling of rock has made certain progress. Especially, the development of the numerical simulation software of THMC four-field coupling interaction combined with TOUGHREACT and FLAC3D, and the multi-field coupling calculation program of Comsol docking with MATLAB provide technical supports for the development of multi-field coupling simulation of rocks. Finally, the key difficulties and future research directions of rock multi-field coupling research were discussed and analyzed, which can provide a reference for engineering practice and related problems.

     

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