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中文摘要：
利用MTS815岩石力学测试系统进行两类三轴压缩对比试验：一类是非充水条件下不同围压时的三轴压缩试验;一类是充水条件且围压保持恒定时不同孔隙水压力作用下的三轴压缩试验。基于莫尔-库仑准则,分析非充水条件下,不同围压σ3作用对细砂岩的峰值破坏强度σ1max及其对应的轴向应变ε1max、剪切强度τ和正应力σ等参数的影响;充水条件下,围压σ3恒定时不同孔隙水压力P作用对细砂岩的峰值破坏强度σ1max及其对应的轴向应变ε1max、有效峰值破坏强度σ1′max、有效围压3σ′、有效剪切强度τ′和有效正应力σ′等参数的影响。研究结果表明：（1）充水条件下,随着有效围压σ3′的增加,有效峰值破坏强度σ1′max呈增大的趋势,但在相同围压条件下随孔隙水压力P的增加有效峰值破坏强度σ1′max呈逐渐减小的趋势;（2）非充水条件下的τ-σ曲线和充水条件下的τ′-σ′曲线既可采用一元二次方程拟合,也可采用线性方程拟合,其相应强度曲线均能较好地符合莫尔-库仑准则;（3）有效剪切强度折减系数K可以较好地表征孔隙水压力P对有效剪切强度τ′的影响。
英文摘要：
Testing study is made on sandstone under two types of triaxial compression experiments with rock mechanic system MTS815.Based on the Mohr-Coulomb criterion,under the condition of non-pore water pressure and different confining pressures,the influence of confining pressure on the parameters such as peak failure strength σ 1max,axial strain ε 1max,shear strength τ and normal stress σ is analyzed;under the condition of pore pressure and constant confining pressure,the influence of pore water pressure P on the parameters such as peak failure strength σ 1maxand the corresponding axial strain ε 1max,effective peak intensity σ 1＇m ax,effective confining pressure σ 3＇,effective shear strength τ＇and effective normal stress σ＇ is analyzed.The following conclusions are drawn：（1） Under the condition of pore water pressure,with the increase of the effective confining pressure,the effective peak failure strength σ 1＇max increases.Under the same confining pressure,however,with the increase of the pore water pressure,the effective peak failure strength σ 1＇ maxreduces.（2） Under either the condition of non-pore water pressure or pore water pressure,both unary quadratic equation and linear equation are fit for the stress-strain relationship;and the corresponding intensity curve is in good agreement with the Mohr-Coulomb criterion.（3） The effective shear strength reduction factor can well demonstrate the influence of the pore water pressure on the effective shear strength.
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