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以齐热哈塔尔水电站引水隧洞高温段的片麻状花岗岩为例,通过不同温度下的室内分级加载三轴蠕变试验,获得了热力耦合作用下岩石稳态蠕变率和强度的变化规律,揭示了考虑温度影响的蠕变破坏模式。结果表明,片麻状花岗岩稳态蠕变率与温度呈非线性正相关,经典软岩稳态蠕变率模型对片麻状花岗岩同样适用;岩石的长期强度与温度呈负相关,并获得了硬脆性岩石长期强度随温度和围压变化的三元素实用公式;随着温度升高,岩石破坏模式呈现由单斜面剪切破坏到共轭剪切破坏的转变,高温对硬岩具有显著软化作用。
Taking the gneissic granite in the high temperature section of the diversion tunnel of Qi’ehardt Hydro Power Station as an example, the steady creep rate and strength of the rock subjected to thermal coupling were obtained through triaxial creep tests at different temperatures. , Revealing creep failure modes that take temperature into account. The results show that the steady-state creep rate of the gneissic granite is positively correlated with the temperature, and the steady-state creep rate of the classical soft rock is also suitable for the gneissic granite. The long-term strength of the rock is negatively correlated with the temperature and obtained The three-element practical formula for the change of long-term strength of hard and brittle rocks with temperature and confining pressure shows that the failure mode of rock exhibits the transition from monoclinic shear failure to conjugate shear failure as the temperature increases, and the high temperature has a significant softening effect on the hard rock .