College of Architecture and Civil Engineering, Xi'an University of Science and Technology School of Highway,
Chang'an University College of Geology and Environment, Xi'an University of Science and Technology Technology
Center, China Railway Tunnel Group Co., Ltd.

针对兰渝铁路二期木寨岭隧道炭质板岩富含裂隙水,遇水易软化的工程特性问题,开展了干燥和饱水状态下炭质板岩基本力学特性的试验研究,包括三轴压缩、巴西劈裂和楔形剪切试验。结果表明:炭质板岩饱水前后的应力峰值、应变峰值以及弹性模量均随围压的提高而增大,泊松比随围压的提高有所降低,并且干燥试样强度和弹性模量对围压的敏感度要高于饱水试样。相对于干燥岩石,饱水状态下岩石的强度峰值降低,而应变峰值提高,并根据楔形剪切试验结果,得到了饱水前后岩石的抗剪强度包络线,反映了水对炭质板岩强度和变形特性具有显著的影响。

According to the engineering characteristics that carbonaceous slate of Muzhailing tunnel Lanzhou- Chongqing railway contained in fracture water and s oftened into water, the authors carried out basic mechanical property tests of carbonaceous slate what included triaxial compression, Brazil and wedge shear tests under the dry and saturated states. The results showed that the peak strength, failure strain and the elastic modulus of carbonaceous slate was accrescent with confining pr essure increased before and after water flling, but PoissonDs ratio was decreased with confining pressure increased. Meanwhile, the dry sample口s strength and elastic modulus sensitivity towards the confining pressure exceed the saturated sample. The peak strength of saturated specimen was reduced compare with the dry rock, how ever the peak strain was improved. At the same time, the shear strength envelope was obtained based on the wedge shear tests before and after water flling. Water ha s a significant impact on strength and deformation characteristics of carbonaceous slate.

陕西省教育厅科学研究计划资助项目(14JK1480)；