SONG Yong-jun LEI Sheng-you MAO Zheng-jun Zou Chong ZHANG Wen-xin
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.
carbonaceous slate; rock mechanics; dry and saturated states; mechanics property;
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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.
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