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THMC多場耦合作用下巖石物理力學性能與本構模型研究綜述

A review of the research on physical and mechanical properties and constitutive model of rock under THMC multi-field coupling

  • 摘要: 巖石多場耦合作用的研究已經開展了數十年,包括巖石在單一物理場、兩場耦合或三場耦合作用效應的研究。然而深部礦產資源開采和地下空間開發中巖體的賦存環境非常復雜,巖體在高溫、高滲透壓、高應力及復雜水化學環境中將發生溫度–水流–應力–化學(THMC)多場耦合作用。綜合分析巖石多場耦合作用下的裂隙演化、變形力學機制、力學本構和耦合模型構建等方面的研究,在分析巖石強度理論的基礎上得出巖石多場耦合本構模型以及巖石蠕變本構模型。不同行業對巖石多場耦合作用的研究重點存在一定的差異,巖石多場耦合作用不僅涉及到礦產資源開發、油氣田開采、地熱資源開發等資源能源領域,其在水利水電工程、高寒工程、地下工程、地下核廢料處置及深埋能源儲庫等領域也是研究的重點。巖石在高應力、水流、高溫和化學作用下,不僅會發生耦合作用,而且會對巖石本身的物理力學性能產生影響。分析研究多場耦合作用下巖石的力學性能對于預防事故發生和保障工程安全開展具有重要的現實意義。最后探討分析了巖石多場耦合研究的重點、難點和今后研究的方向,為工程實踐和相關問題的解決提供參考。

     

    Abstract: The study of multi-field coupling of rocks has been carried out for decades, including the effects of single physical field, two-field coupling, and three-field coupling of rocks. However, the occurrence environment of rock mass in deep mining of mineral resources and underground space development is very complex. Thermal–hydrological–mechanical–chemical (THMC) multi-field coupling effect will occur in rock mass under high temperature, high osmotic pressure, high stress, and complex hydrochemical environment. The multi-field coupling of rocks is not the simple superposition of multiple physical fields, but the mutual influence and action of each physical field. The research on fracture evolution, deformation mechanics mechanism, mechanical constitutive and coupling model construction was comprehensively analyzed. Based on the analysis of rock strength theory, the development of a rock multi-field coupling constitutive model and a rock creep constitutive model were obtained. There are some differences in the research focus of multi-field coupling of rocks for different industries. The multi-field coupling of rocks not only involves the development of mineral resources, oil and gas fields, geothermal resources and other resources and energy fields, but also water conservancy and hydropower engineering, alpine engineering, underground engineering, underground nuclear waste disposal, and deep buried energy storage. Under the action of high stress, seepage, high temperature and chemical action, not only will the coupling effect occur, but the physical and mechanical properties of rock itself will be affected. It is of great practical significance to analyze and study the mechanical properties of rocks under the action of multi-field coupling for preventing accidents and ensuring engineering safety. Finally, the key and difficult points of rock multi field coupling research and the direction of future research were discussed, which provides a reference for engineering practice and related problems.

     

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