考虑温度效应的片麻状花岗岩三轴蠕变试验研究

发布时间：2018-04-16 19:01

本文选题：水电站引水隧洞 + 片麻状花岗岩　；参考：《岩土力学》2017年09期

【摘要】：随着地下洞室开挖深度的增加,温度已成为影响洞室长期稳定的重要因素。为有效反映温度对深埋地下洞室围岩长期稳定的影响,依托某水电站引水隧洞工程,开展了不同温度和不同加载应力路径条件下片麻状花岗岩的三轴蠕变试验,系统分析了温度、围压、轴压对片麻状花岗岩蠕变变形特征、蠕变强度和蠕变破坏模式的影响。通过蠕变试验发现:片麻状花岗岩的蠕变性能随着加载应力的增大和温度的升高而呈指数变化;片麻状花岗岩存在蠕变应力阈值,且温度越高,蠕变应力阈值越低,蠕变破坏时间越短;片麻状花岗岩稳态蠕变速率随温度的升高而增大,符合指数关系,其蠕变长期强度和蠕变破坏强度均随温度的升高而降低;在温度效应条件下,片麻状花岗岩蠕变破坏模式主要为沿斜截面的剪切破坏。试验研究成果为水电站引水隧洞围岩长期稳定性分析与设计、施工提供了重要的试验依据。
[Abstract]:With the increase of excavation depth, temperature has become an important factor affecting the long-term stability of underground cavern.In order to reflect the effect of temperature on the long-term stability of the surrounding rock of deep underground cavern, triaxial creep tests of granitoids were carried out under different temperatures and different loading stress paths, depending on the diversion tunnel project of a hydropower station.The effects of temperature, confining pressure and axial pressure on creep deformation characteristics, creep strength and creep failure mode of granitic granites were systematically analyzed.The creep tests show that the creep behavior of granitic granites changes exponentially with the increase of loading stress and temperature, and the creep stress threshold exists in granitic granites, and the higher the temperature is, the lower the creep stress threshold is.The creep failure time is shorter, and the steady creep rate of granitic granites increases with the increase of temperature, which accords with the exponential relationship. The long-term creep strength and creep failure strength of granitic granites decrease with the increase of temperature.The creep failure mode of granitic granites is mainly shear failure along oblique section.The experimental results provide an important experimental basis for the long-term stability analysis and design of the surrounding rock of the diversion tunnel of the hydropower station.
【作者单位】：山东大学岩土与结构工程研究中心;山东大学后勤保障部;
【基金】：国家重点研发计划项目资助(No.2016YFC0401804) 中国博士后科学基金项目资助(No.2016M600537)~~
【分类号】：TV223

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