摘要采用锦屏二级水电站埋深2 000 m的白山组大理岩试样进行单轴压缩–声发射试验，通过试验结果的分析确定白山组大理岩的启裂强度和损伤强度，分别为0.4～0.5倍和0.8倍的单轴抗压强度，试验结果与加拿大URL针对Lac du Bonnet花岗岩的测试成果相接近。针对白山组深埋大理岩开展室内三轴压缩试验，试验成果显示锦屏白山组大理岩随着围压的增大其峰后应力–应变曲线具有明显的脆–延–塑转换特征。对比锦屏白山组大理岩、Lac du Bonnet花岗岩以及三峡花岗岩的三轴试验成果，说明大理岩和花岗岩峰后力学特征的显著差异。采用Hoek-Brown强度准则的本构模型描述大理岩的脆–延–塑转换特征，并将研究成果应用于引水隧洞的围岩损伤深度预测。
Abstract：The axial compression and acoustic emission(AE) tests on T2b marble samples at the depth of 2 000 m show that the crack initiation strength equals 0.4–0.5 times UCS(unconfined compression strength)；and the crack damage strength approximately equal 0.8 times UCS. The results of T2b marble are similar to the results of Lac du Bonnet granite in URL(underground research laboratory)，Canada. The triaxial tests on Jinping marble show a brittle-ductile-plastic transition with increase in confining pressure. A comparison study among T2b marble，Lac du Bonnet granite and Three Gorge granite is carried out to show the difference in post peak mechanical behavior. The brittle-ductile-plastic transition of T2b marble is described by using the constitutive model based on Hoek-Brown strength criterion. The study results are applied to prediction of damage depth in excavation damage zone(EDZ) of diversion tunnels at Jinping II hydropower station.
2010, Vol. 29 
