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为研究不同方向频繁扰动对节理岩体力学特性及损伤规律的影响,利用伺服试验机对南坡铜矿砂岩平行层理方向、垂直层理方向进行单轴循环加卸载,每次应力水平依次递增的实验,直至岩石破坏,通过实验数据分析得到:1平行层理方向加载的泊松比和弹性模量比垂直层理方向大,破坏强度相反;2卸载阶段的弹性模量和泊松比总比对应的加载阶段的要大;3随着循环次数的增加,两种加载方向均体现出形成的封闭塑性滞回环的面积逐渐增大,但垂直层理方向增加幅度要明显大于平行层理方向;且对应的各循环阶段的滞回环面积比平行层理方向要大;4每次循环残余变形量总比上一次的要大,但增长速度降低,降低幅度为5%~10%;5对于两种不同的加载方向,损伤规律、纵向应变的发展及应力大小有很好的一一对应关系,且岩石的损伤记忆性不受各向异性影响.
In order to study the influence of frequent disturbance in different directions on the mechanical properties and damage laws of jointed rock mass, the uniaxial cyclic unloading and unloading of parallel loading direction and vertical bedding direction of south slope copper sandstone were carried out by servo testing machine, and each stress level was increased The experimental results show that the Poisson’s ratio and the elastic modulus of the parallel bedding direction are larger than the vertical bedding direction and the damage strength is opposite. 2 The elastic modulus and Poisson’s Ratio Corresponding to the loading phase is larger; 3 with the increase of the number of cycles, both loading directions showed that the area of the closed plastic hysteresis loop formed gradually increased, but the vertical bedding direction increased significantly more than the parallel bedding direction; And the corresponding hysteresis loop area is larger than the parallel bedding direction. 4 The residual deformation of each cycle is always larger than the previous one, but the growth rate decreases by 5% -10%. 5 For two There is a good one-to-one correspondence between the different loading directions, the damage laws, the development of longitudinal strain and the stress magnitude, and the damage memory of the rock is not affected by the anisotropy.