Rock-like replicas with different dip-angle flaws were tested in an apparatus with axial loading and lateral restraint to study the stress-strain characteristics of high-porosity rock with a single flaw. The results showed that a coefficient of the lateral stress could be calculated using a coefficient of the lateral frictional resistance and frictional coefficient. It was determined that the lateral stress increases linearly with axial loading. The relationship between the flaw aperture and loading can be described by an exponential function. The high-porosity rock mass with a single flaw exhibited a creep deformation, which was practically no creep deformation during an initial loading stage and then increased remarkably when the loading pressure exceeded the uniaxial compressive strength. The internal flaw affected a lateral deformation of the porous space for a high-porosity rock replica, which was limited to outside lateral deformation, and the porosity structure collapse was the main reason for the flaw closure. Elastic-plastic stage, collapse stage, and strain-hardening stage were investigated in the rock replica stress-strain process, and the strain-hardening process was generated after the flaw closure. The volumetric ratio of fracture volume to porosity was kept constant in the first loading process, and after the porosity structure collapsed, the ratio decreased quickly, and porosity deformation played a dominant role in the overall strain. This study provided a new understanding related to research of stress-strain characteristics of fractured-porous rock.

中文翻译：

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轴向载荷和侧向约束下单孔高孔隙度岩体的变形特征

在具有轴向载荷和侧向约束的装置中测试了具有不同倾角缺陷的类岩石复制品，以研究具有单个缺陷的高孔隙度岩石的应力应变特性。结果表明，可以利用侧向摩擦阻力系数和摩擦系数来计算侧向应力系数。可以确定，横向应力随轴向载荷线性增加。缺陷孔径和载荷之间的关系可以通过指数函数来描述。具有单个缺陷的高孔隙率岩体表现出蠕变变形，实际上在初始加载阶段没有蠕变变形，然后在加载压力超过单轴抗压强度时显着增加。内部缺陷影响了高孔隙率岩石复制品的多孔空间的横向变形，这种变形仅限于外部横向变形，而孔隙结构的崩塌是造成缺陷封闭的主要原因。在岩石复制品的应力-应变过程中研究了弹塑性阶段，塌陷阶段和应变硬化阶段，并在裂纹闭合后产生了应变硬化过程。在第一次加载过程中，裂缝体积与孔隙的体积比保持恒定，并且在孔隙结构塌陷后，该比率迅速下降，孔隙变形在整个应变中起主导作用。该研究提供了与裂隙岩石应力应变特性研究有关的新认识。限于外部横向变形，而孔隙结构塌陷是造成裂纹闭合的主要原因。在岩石复制品的应力-应变过程中研究了弹塑性阶段，塌陷阶段和应变硬化阶段，并在裂纹闭合后产生了应变硬化过程。在第一次加载过程中，裂缝体积与孔隙的体积比保持恒定，并且在孔隙结构塌陷后，该比率迅速下降，孔隙变形在整个应变中起主导作用。该研究提供了与裂隙岩石应力应变特性研究有关的新认识。限于外部横向变形，而孔隙结构塌陷是造成裂纹闭合的主要原因。在岩石复制品的应力-应变过程中研究了弹塑性阶段，塌陷阶段和应变硬化阶段，并在裂纹闭合后产生了应变硬化过程。在第一次加载过程中，裂缝体积与孔隙的体积比保持恒定，并且在孔隙结构塌陷后，该比率迅速下降，孔隙变形在整个应变中起主导作用。该研究提供了与裂隙岩石应力应变特性研究有关的新认识。研究了岩石复制品应力应变过程中的应变硬化阶段，并在缺陷封闭后产生了应变硬化过程。在第一次加载过程中，裂缝体积与孔隙的体积比保持恒定，并且在孔隙结构塌陷后，该比率迅速下降，孔隙变形在整个应变中起主导作用。该研究提供了与裂隙岩石应力应变特性研究有关的新认识。研究了岩石复制品应力应变过程中的应变硬化阶段，并在缺陷封闭后产生了应变硬化过程。在第一次加载过程中，裂缝体积与孔隙的体积比保持恒定，并且在孔隙结构塌陷后，该比率迅速下降，孔隙变形在整个应变中起主导作用。该研究提供了与裂隙岩石应力应变特性研究有关的新认识。孔隙变形在总应变中起主导作用。该研究提供了与裂隙岩石应力应变特性研究有关的新认识。孔隙变形在总应变中起主导作用。该研究提供了与裂隙岩石应力应变特性研究有关的新认识。