摘要：
In order to study the deformation characteristics of rock in the loading process under the action of seepage pres -sure, the triaxial compression tests on red sandstone under seepage pressure were carried out by using the GDS -VIS triaxial rheometer , and the change laws of axial strain , radial strain and deformation modulus of rock in the deviator stress loading process under the effect of seepage pressure were studied .The results showed that the peak stress of rock decreased with the increase of seepage pressure , and the changing amplitude of axial strain corresponding to the rock failure was smaller , while that of radial strain was larger .With the increase of seepage pressure , the deformation modulus of rock in each loading stage decreased relatively , the maximum deformation modulus also decreased with different degrees , and the axial strain corre-sponding to the maximum deformation modulus presented a backward trend .With the increase of deviator stress , the deforma-tion modulus increased gradually , and the maximum value appeared at the later period of elastic deformation stage .The axial strain increased gradually in the whole process , and the radial strain increased obviously after the maximum deformation mod-ulus appeared , which showed that compared with the axial strain , the radial variation is more able to reflect the decrease of deformation modulus and the reduction of strength of rock during the loading process .The results provide a reference for stud-ying the deformation and strength characteristics of rock under seepage pressure .%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.
