热力耦合作用下硬脆性岩石蠕变性质试验研究

发布时间：2018-02-20 03:49

  本文关键词： 片麻状花岗岩 热力耦合 蠕变试验 稳态蠕变率 岩石强度 破坏模式　出处：《水电能源科学》2017年08期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Taking the granitic granitoids in the high temperature section of the diversion tunnel of the Zizehattar Hydropower Station as an example, the steady state creep rate and strength of the rock under thermal coupling are obtained by triaxial creep tests under different temperatures. The creep failure mode considering the influence of temperature is revealed. The results show that the steady creep rate of granitic granites is nonlinear positive correlation with temperature, and the classical model of steady creep rate of soft rock is also suitable for granitic granites. The long-term strength of rock is negatively correlated with temperature, and a practical formula of three elements is obtained for the change of long-term strength of hard brittle rock with temperature and confining pressure, and with the increase of temperature, The failure mode of rock shows the transition from single slope shear failure to conjugate shear failure, and the high temperature has a significant softening effect on hard rock.
【作者单位】： 潍坊学院建筑工程学院;青岛理工大学管理学院;山东省建设建工(集团)有限责任公司;
【分类号】：TV223
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本文编号：1518691