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循環加、卸載速率對砂巖變形和滲透特性的影響

Deformation and permeability of sandstone at different cycling loading-unloading rates

  • 摘要: 通過煤巖熱流固耦合試驗系統(THM-2)對砂巖進行循環加、卸載試驗,研究加、卸載速率對其變形和滲透特性的影響.結果表明:初始循環時,巖石的軸向變形量△ε1較大,隨著循環試驗的進行,△ε1趨于穩定,受卸載速率v2的影響較小.加載變形模量和卸載變形模量均逐漸上升,隨著循環次數的增加,上升速度逐漸變緩;同一循環內,卸載變形模量大于加載變形模量,且隨著加、卸載的進行,差值逐漸減小.加載階段和卸載階段滲透率變化量的差值隨著循環次數的增加逐漸減小;從第5次循環開始,滲透率曲線呈“∞”形,滲透率演化規律可以用軸向應變的變化特點表征,軸向應變的變化量△ε1i受到卸載速率v2i和應力加載上限σmaxi的綜合作用,二者對應變在卸載初期起到積極的促進作用,三者之間的相互關系可用冪函數表達.

     

    Abstract: In order to research the effect of cycling loading and unloading rates on the deformation and permeability of sandstone, cycling loading and unloading tests were performed with a self-made thermal-hydrological-mechanical coupling test system for gas-infiltrated coal and rock. The results show that the axial deformation of sandstone 駐著 1 is larger in the initial cycle and tends to be stable with cycling, but the influence of unloading rate is minimal. The loading deformation modulus and unloading deformation modulus both increase and the rising speed becomes slow with the increase of the number of cycles. In the same cycle, the unloading deformation modulus is bigger than the loading deformation modulus, and their difference gradually decreases with the test proceeding. Meanwhile, the difference of permeability variations in loading and unloading phases decreases with the increasing of unloading rate. Starting from the fifth cycle, the shape of permeability curves is "∞". The evolution rule of permeability can be characterized by using the change regularity of axial strain. The variation of axial strain △ε1i is influenced by unloading rate v2i and loading stress σmaxi, which both promote the development of strain. The relationship of them can be characterized with a power function.

     

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