关键词: 石英云母片岩, 各向异性, UDEC, 数值模拟

Abstract: In order to study the anisotropic properties of Danba schist, the field triaxial loading and unloading tests were implemented firstly. Based on the test results of specimen strength and deformation parameters, a numerical model was built for the uniaxial or triaxial compression test with the UDEC. The main objective of this study was to investigate the anisotropy of Danba schist on strength and deformability by simulating a series compression tests with series schistosity angle. Followed, based on the previous research, an excavation process of typical tunnel was analyzed in detail. Comparison between the numerical calculation results and the field test data showed that the responses were slightly different. The analysis result indicated that rock strength and deformation properties were noticeably dependent on schistosity, and the schist anisotropy can have a significant impact on the failure behavior of tunnel surrounding rock. Objectively speaking, by UDEC analysis, the anisotropy characteristics of Danba schist can be reflected, however, some complex mechanics should be studied in the future.

Key words: quartz-mica schist, anisotropy, UDEC, numerical simulation