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对丹巴电站调压井围岩的片岩试样进行了加载试验和卸荷试验研究,分别分析了常规三轴试验及加轴压卸围压、以相同速率同时卸轴压与围压的3种加、卸载方式下的应力-应变关系及整个加、卸载过程中变形参数的变化规律,分析表明:片岩在卸荷条件下表现出明显的脆性破坏特征,而且有强烈的扩容现象,卸荷条件下岩石的破坏也是由于扩容所引起的;卸荷会造成岩体变形模量迅速减小、泊松比迅速增大;试验采取的两种卸荷方式与常规三轴相比较,岩石试样从受力至破坏的整个过程中其变形模量和泊松比的变化趋势有明显的不同,尤其是在相同速率同时卸轴压与围压的卸荷方式对岩石的变形参数影响很大。
Load tests and unloading tests were carried out on the schist samples of the surge rock at the surge tank in Danba power station. The effects of conventional triaxial tests and unloading pressure on the unloading and unloading of the shaft at the same rate were analyzed respectively. The relationship between stress and strain under different loading and unloading methods and the variation law of deformation parameters during the whole loading and unloading process shows that the schist has obvious brittle failure characteristics under unloading condition, Under the conditions of rock damage is also caused by the expansion; unloading will cause the rock mass deformation modulus decreases rapidly, the Poisson’s ratio increases rapidly; two unloading methods taken test compared with the conventional triaxial rock samples The change trend of deformation modulus and Poisson’s ratio are obviously different from stress to damage in whole process, especially the unloading of axial pressure and confining pressure at the same rate has a great influence on the deformation parameters of rock.