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进行了单轴压缩试验条件下重复加载时加载方向变化对细晶花岗岩凯塞效应的影响试验研究。试验发现,加载方向不变或加载角度变为7°时,岩石的凯塞效应明显;加载角度为10°和15°时,部分试件由于受试验环境、试件加工等因素的影响观测不到凯塞效应。试验统计数据表明,重复加载时加载方向变化越大,其凯塞效应越弱。研究同时发现:加载方向变化对凯塞效应的影响还取决于岩石的受力状态,单轴压缩状态下,岩石受力状态单一,重复加载时加载方向的轻微变化不会影响岩石对历史应力的记忆能力;劈裂状态下,圆盘试样应力状态复杂,加载方向的轻微变化足以引起试样内应力的重分布,进而影响岩石的凯塞效应。
Experimental study on the effect of loading direction on the Kaiser effect of fine grained granite under uniaxial compression test under repeated loading is carried out. It is found that the Kaiser effect of the rock is obvious when the loading direction is the same or the loading angle is changed to 7 °. When the loading angle is 10 ° and 15 °, some of the specimens are not observed under the influence of the test environment and specimen processing To the Kaiser effect. Experimental statistics show that the greater the change of load direction during repeated loading, the weaker the Kaiser effect. The study also found that the influence of the loading direction on the Kaiser effect is also dependent on the stress state of the rock. Under uniaxial compression, the stress state of the rock is single, and slight changes in the loading direction during repeated loading will not affect the rock’s response to historical stress Memory ability. Under the splitting condition, the stress state of the disk specimen is complex, and slight changes in the loading direction are enough to cause the redistribution of stress in the specimen, thus affecting the Kaiser effect of the rock.