大理岩干湿循环力学特性试验研究

发布时间：2018-04-19 08:47

本文选题：大理岩 + 干湿循环　；参考：《水利学报》2017年10期

【摘要】：针对库水变幅带边坡岩体水力风化作用下性能劣化现象,选取锦屏水电站左岸边坡大理岩为研究对象,采用干湿循环处理,开展了单轴和不同围压下的三轴压缩试验,研究了大理岩在不同干湿循环作用下强度、变形和破坏形式等力学特性。试验结果表明:大理岩单轴峰值强度与干湿循环次数呈负相关关系,初次循环阶段的劣化效应显著;较低循环次数下大理岩内摩擦角基本不变,黏聚力有较大幅度下降,总体上黏聚力受干湿循环作用的影响效应比内摩擦角更敏感;干湿循环对大理岩有一定程度的软化作用,多次循环后大理岩弹性模量逐渐降至临界值,围压的增加能有效弱化这种软化作用。
[Abstract]:Aiming at the deterioration of rock mass performance under hydraulic weathering of slope with variable amplitude belt of reservoir water, the marble of the left bank slope of Jinping Hydropower Station was selected as the research object, and the triaxial compression tests under uniaxial and different confining pressures were carried out by using dry and wet cycle treatment.The mechanical properties of marble under different dry and wet cycles, such as strength, deformation and failure form, are studied.The experimental results show that the uniaxial peak strength of marble is negatively related to the number of dry and wet cycles, and the deterioration effect is significant at the first cycle stage, while the internal friction angle of marble is basically unchanged and the cohesion force decreases greatly under the lower cycle times.On the whole, the cohesive force is more sensitive to the effect of dry-wet cycle than to the angle of internal friction, the dry and wet cycles soften marble to a certain extent, and the elastic modulus of marble decreases gradually to the critical value after repeated cycles.The increase of confining pressure can effectively weaken this softening effect.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学江苏省岩土工程技术工程研究中心;
【基金】：国家自然科学基金项目(11672343,51679068) 中央高校基本科研业务费专项资金项目(2016B20214)
【分类号】：TV223

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