發(fā)布時(shí)間：2018-04-16 19:01

  本文選題：水電站引水隧洞 + 片麻狀花崗巖　； 參考：《巖土力學(xué)》2017年09期

【摘要】：隨著地下洞室開挖深度的增加,溫度已成為影響洞室長(zhǎng)期穩(wěn)定的重要因素。為有效反映溫度對(duì)深埋地下洞室圍巖長(zhǎng)期穩(wěn)定的影響,依托某水電站引水隧洞工程,開展了不同溫度和不同加載應(yīng)力路徑條件下片麻狀花崗巖的三軸蠕變?cè)囼?yàn),系統(tǒng)分析了溫度、圍壓、軸壓對(duì)片麻狀花崗巖蠕變變形特征、蠕變強(qiáng)度和蠕變破壞模式的影響。通過蠕變?cè)囼?yàn)發(fā)現(xiàn):片麻狀花崗巖的蠕變性能隨著加載應(yīng)力的增大和溫度的升高而呈指數(shù)變化;片麻狀花崗巖存在蠕變應(yīng)力閾值,且溫度越高,蠕變應(yīng)力閾值越低,蠕變破壞時(shí)間越短;片麻狀花崗巖穩(wěn)態(tài)蠕變速率隨溫度的升高而增大,符合指數(shù)關(guān)系,其蠕變長(zhǎng)期強(qiáng)度和蠕變破壞強(qiáng)度均隨溫度的升高而降低;在溫度效應(yīng)條件下,片麻狀花崗巖蠕變破壞模式主要為沿斜截面的剪切破壞。試驗(yàn)研究成果為水電站引水隧洞圍巖長(zhǎng)期穩(wěn)定性分析與設(shè)計(jì)、施工提供了重要的試驗(yàn)依據(jù)。
[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.
【作者單位】： 山東大學(xué)巖土與結(jié)構(gòu)工程研究中心;山東大學(xué)后勤保障部;
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目資助(No.2016YFC0401804) 中國(guó)博士后科學(xué)基金項(xiàng)目資助(No.2016M600537)~~
【分類號(hào)】：TV223

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1 江力宇;考慮溫度影響的片麻狀花崗巖蠕變力學(xué)特性與理論分析研究[D];山東大學(xué);2016年

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