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为得到层状岩体在真三轴压缩情况下的强度变形特征,利用数值分析方法建立计算模型,得到不同结构面倾角β下试样的应力和变形响应,结果表明,(1)加载初期,结构面倾角β=0°和β=90°试样对应的初始弹性模量最大;随着试样变形的增大,对应的弹性模量以β=90°、60°、0°的顺序逐渐减小;β=90°和β=0°试样发生破坏的脆性特征比较明显;(2)随着围压σ3=σ2的增大,压缩强度σ1不断增大;围压对强度极值发生的位置影响不大;(3)最小主应力与结构面走向平行情况下,随着中间主应力σ2的增大,试样压缩强度呈现先增大后减小的趋势;随着最小主应力σ3的增大,σ1逐渐增大;当σ3较小时,二者符合线性关系;随着σ3的增大,二者的关系逐渐呈现非线性特征;并且结构面滑移破坏型试样的非线性特征更加明显;(4)最小主应力与结构面走向垂直的情况下层状岩体的压缩强度与中间主应力和最小主应力的关系均呈现显著的线性特征。
In order to obtain the strength and deformation characteristics of layered rock mass under true triaxial compression, the numerical model is established by numerical analysis to get the stress and deformation response of specimens with different structural face dip angle β. The results show that: (1) The initial elastic modulus corresponding to the structural plane inclination β = 0 ° and β = 90 ° is the largest. With the increase of deformation, the corresponding elastic modulus gradually decreases in the order of β = 90 °, 60 °, 0 ° (2) With the increase of confining pressure σ3 = σ2, the compressive strength σ1 increases continuously; and the confining pressure has a great effect on the intensity extreme value (3) When the minimum principal stress is parallel to the structural plane, with the increase of the intermediate principal stress σ2, the compressive strength of the sample first increases and then decreases; with the minimum principal stress σ3 , And σ1 gradually increases. When σ3 is small, the two are in a linear relationship. With the increase of σ3, the relationship between the two shows a nonlinear characteristic gradually. And the non-linear characteristics of the structural failure-slip specimen (4) The compressive strength and intermediate principal stress of layered rock mass under the condition that the minimum principal stress and structural plane are perpendicular to each other Relationship minimum principal stress showed a significant linear characteristics.