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为研究周期荷载对工程岩体长期稳定性的影响作用,利用Rockman207岩石力学试验系统对黄砂岩试件进行了单轴条件下不同上限应力和应力幅值的周期荷载疲劳试验。试验结果表明:黄砂岩的疲劳破坏受到静态应力–应变全过程曲线轴向、环向以及体积变形量的控制,在控制曲线的峰值强度或峰值强度之后,疲劳试验过程中会出现“初始破坏”;黄砂岩疲劳破坏轴向和环形不可逆变形的3阶段发展规律的本质影响因素是产生的应变速率不同,黄砂岩的疲劳破坏过程是轴向和环向不可逆变形不断累积的过程;在一定条件下,黄砂岩的循环次数–上限应力曲线(N–S曲线)可以用来预测岩石的疲劳寿命。
In order to study the effect of periodic load on the long-term stability of engineering rock mass, cyclic loading fatigue tests with different upper limit stress and stress amplitude under uniaxial condition were carried out using Rockman 207 rock mechanics test system. The experimental results show that the fatigue failure of the yellow sandstone is controlled by the axial, circumferential and volumetric deformation of the whole curve of the static stress-strain process. After the peak or peak strength of the control curve, the initial damage The essential factor of the three-phase development law of the axial failure and annular irreversible deformation of the yellow sandstone is the different strain rate. The process of fatigue failure of yellow sandstone is the process of cumulative axial and circumferential irreversible deformation. Under the conditions, the number of cycles of yellow sandstone-upper limit stress curve (N-S curve) can be used to predict the fatigue life of rock.