渗透压力作用下岩石三轴压缩过程变形特性分析

发布时间：2018-03-30 07:23

本文选题：岩石力学　切入点：渗透压力　出处：《中国安全生产科学技术》2017年12期

【摘要】：为研究渗透压力作用下岩石承载过程中的变形特性,采用GDS-VIS三轴流变仪对红砂岩开展渗透压力作用下的三轴压缩试验,研究各渗透压力作用下偏应力加载过程中岩石轴向应变、径向应变和变形模量的变化规律。结果表明:随渗压增大,岩石峰值应力减小,岩石破坏时对应的轴向应变的变化幅度较小,而径向应变的变化幅度则较大;随渗压增加,岩石对应的各承载阶段的变形模量相对减小,最大变形模量也出现不同程度的降低,同时最大变形模量对应的轴向应变有后移趋势;随偏应力增加,变形模量逐渐增大,并在弹性变形阶段后期出现最大值,整个过程中轴向应变逐渐增加,径向应变则在变形模量最大值出现后才明显增大,说明与轴向应变相比径向应变更能够反映出岩石承载过程变形模量的减小和强度的降低。研究结果为探讨类似岩石渗透压力作用下的变形和强度特性提供参考。
[Abstract]:In order to study the deformation characteristics of rock under seepage pressure, a triaxial compression test of red sandstone under permeation pressure was carried out by using GDS-VIS triaxial rheometer. The change of radial strain and deformation modulus. The results show that the peak stress of rock decreases with the increase of seepage pressure, and the variation range of axial strain in rock failure is smaller, while the change of radial strain is larger, and the change of radial strain increases with the increase of osmotic pressure. The deformation modulus of each bearing stage of rock is relatively reduced, and the maximum deformation modulus is decreased to some extent, and the axial strain corresponding to the maximum deformation modulus has a trend of backward shift, and the deformation modulus increases gradually with the increase of deviant stress. In the later stage of elastic deformation, the maximum value appeared, the axial strain gradually increased during the whole process, and the radial strain increased only after the maximum deformation modulus appeared. Compared with axial strain, radial strain can reflect the decrease of deformation modulus and strength in rock bearing process. The results provide a reference for studying the deformation and strength characteristics of similar rock under seepage pressure.
【作者单位】：江西理工大学资源与环境工程学院;江西省矿业工程重点实验室;中国安全生产科学研究院;
【基金】：国家自然科学基金项目(51564012)
【分类号】：TU45

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